研究者詳細 - 牧迫　飛雄馬

論文 - 牧迫　飛雄馬

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Doi Takehiko, Shimada Hiroyuki, Makizako Hyuma, Tsutsumimoto Kota, Uemura Kazuki, Anan Yuya, Suzuki Takao . Cognitive function and gait speed under normal and dual-task walking among older adults with mild cognitive impairment. . BMC Neurol14 67 - 67 2014年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Gait ability and cognitive function are interrelated during both normal walking (NW) and dual-task walking (DTW), and gait ability is thus adversely affected by cognitive impairment in both situations. However, this association is insufficiently understood in people with mild cognitive impairment (MCI). Here, we conducted a study with MCI participants, to examine whether the association depends on walking conditions and MCI subtypes. METHODS: We classified 389 elderly adults into amnestic MCI (n = 191) and non-amnestic MCI (n = 198), assessed their cognitive functions, and administered gait experiments under NW and DTW conditions. Gait ability was defined as gait speed. Five aspects of cognitive function were assessed: processing speed, executive function, working memory, verbal memory, and visual memory. RESULTS: Regression analysis adjusted for covariates showed a significant association between cognitive functions and gait speed. Processing speed and executive function correlated with gait speed during both NW and DTW (p < .05). Gait speed during DTW was also significantly associated with working memory (p < .001). Visual memory was associated during NW and DTW, particularly for amnestic MCI participants (p < .05). CONCLUSIONS: Our findings support the idea that the association between gait speed and cognitive function depends on walking condition and MCI subtypes. Additional studies are necessary to determine the neural basis for the disruption in gait control in older adults with MCI.

DOI： 10.1186/1471-2377-14-67

Yoshida Daisuke, Suzuki Takao, Shimada Hiroyuki, Park Hyuntae, Makizako Hyuma, Doi Takehiko, Anan Yuya, Tsutsumimoto Kota, Uemura Kazuki, Ito Tadashi, Lee Sangyoon . Using two different algorithms to determine the prevalence of sarcopenia. . Geriatr Gerontol Int14 Suppl 1 46 - 51 2014年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

AIM: Several operative definitions and screening methods for sarcopenia have been proposed in previous studies; however, the opinions of researchers still differ. We compared the prevalence of sarcopenia using two different algorithms: (i) the European working group on sarcopenia in older people (EWGSOP)-suggested algorithm using gait speed as the first step; and (ii) the muscle mass and strength algorithm. METHODS: A population-based, cross-sectional survey of adults aged over 65 years was carried out. Data on a total of 4811 participants were available for analysis. Gait speed, grip strength and appendicular skeletal muscle mass were assessed to determine sarcopenia. Appendicular skeletal muscle mass was estimated from bioimpedance analysis measurements and expressed as skeletal muscle mass index. Grip strength and skeletal muscle mass index were considered to be low if they fell below the threshold of the lowest 20% of values measured in a subset of healthy subjects. We compared the prevalence rates of sarcopenia determined by the two algorithms. RESULTS: The prevalence rate of sarcopenia in a representative sample of older Japanese adults was 8.2% for men and 6.8% for women based on the EWGSOP algorithm. The two algorithms identified the same participants as sarcopenic, the only difference being the EWGSOP algorithm classified an additional seven participants (0.15%) into sarcopenia compared with the muscle mass and strength algorithm. CONCLUSION: It is debatable whether inclusion of gait speed is necessary when screening for sarcopenia in community-dwelling older adults. Future research should examine the necessity of including gait speed in algorithms and the validity of cut-off values.

DOI： 10.1111/ggi.12210

Makizako Mihoko, Makizako Hyuma, Doi Takehiko, Uemura Kazuki, Tsutsumimoto Kota, Miyaguchi Hideki, Shimada Hiroyuki . Olfactory identification and cognitive performance in community-dwelling older adults with mild cognitive impairment. . Chem Senses39 ( 1 ) 39 - 46 2014年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

Olfactory impairment constitutes one of the earliest signs of Alzheimer's disease in older adults with mild cognitive impairment. We investigated which aspects of neuropsychological measures are correlated with olfactory identification performance among older adults with mild cognitive impairment. Total of 220 participants with mild cognitive impairment (mean age 71.7 years) were examined. Odor identification was assessed using the Open Essence test. Participants underwent comprehensive neurocognitive evaluation, including measures of verbal memory, visual memory, working memory, attention/executive function, and processing speed. We examined associations between olfactory function and cognitive performance scores. Participants with severe hyposmia exhibited significantly poor verbal and visual memory performance, attention/executive function, and slower processing speed scores compared with those without severe hyposmia. In multivariable logistic regression models, better performance scores on verbal and visual memory were significantly associated with decreased likelihood of severe hyposmia after adjusting for age, sex, education, and other cognitive performance scores. These findings suggest that olfactory impairment might be more closely associated with memory loss compared with other aspects of cognitive functioning in mild cognitive impairment subjects.

DOI： 10.1093/chemse/bjt052

Shimada Hiroyuki, Makizako Hyuma, Doi Takehiko, Yoshida Daisuke, Tsutsumimoto Kota, Anan Yuya, Uemura Kazuki, Lee Sangyoon, Park Hyuntae, Suzuki Takao . A large, cross-sectional observational study of serum BDNF, cognitive function, and mild cognitive impairment in the elderly. . Front Aging Neurosci6 69 - 69 2014年

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVE: The clinical relationship between brain-derived neurotrophic factor (BDNF) and cognitive function or mild cognitive impairment (MCI) is not well-understood. The purpose of this study was to identify the relationship between serum BDNF and cognitive function and MCI, and determine whether serum BDNF level might be a useful biomarker for assessing risk for MCI in older people. MATERIALS AND METHODS: A total of 4463 individuals aged 65 years or older (mean age 72 years) participating in the study. We measured performance in a battery of neuropsychological and cognitive function tests; serum BDNF concentration. RESULTS: Eight hundred twenty-seven participants (18.8%) had MCI. After adjustment for sex, age, education level, diabetes, and current smoking, serum BDNF was associated with poorer performance in the story memory, and digit symbol substitution task scores. Serum BDNF was marginally associated with the presence of MCI (odds ratio, 95% confidence interval: 1.41, 1.00-1.99) when BDNF was 1.5 SD lower than the mean value standardized for sex and age, education level, diabetes, and current smoking. CONCLUSION: Low serum BDNF was associated with lower cognitive test scores and MCI. Future prospective studies should establish the discriminative value of serum BDNF for the risk of MCI.

DOI： 10.3389/fnagi.2014.00069

Makizako Hyuma, Shimada Hiroyuki, Park Hyuntae, Doi Takehiko, Yoshida Daisuke, Uemura Kazuki, Tsutsumimoto Kota, Suzuki Takao . Evaluation of multidimensional neurocognitive function using a tablet personal computer: test-retest reliability and validity in community-dwelling older adults. . Geriatr Gerontol Int13 ( 4 ) 860 - 866 2013年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

AIM: This study sought to confirm the test-retest reliability and validity of the National Center for Geriatrics and Gerontology functional assessment tool (NCGG-FAT), a newly developed assessment of multidimensional neurocognitive function using a tablet personal computer (PC). METHODS: This study included 20 community-dwelling older adults (9 females, aged 65-81 years). Participants were administered the NCGG-FAT twice, separated by approximately 30 days to determine test-retest reliability. To test the validity of the measure, participants underwent established neurocognitive measurements, including memory, attention, executive function, processing speed and visuospatial function within a week from the first administration of the NCGG-FAT. RESULTS: Test-retest reliability was in an acceptable range for each component of the NCGG-FAT, with intraclass correlation coefficients ranging from 0.764 to 0.942. Each task in the NCGG-FAT showed a moderate to high correlation with scores on widely-used conventional neurocognitive tests (r = 0.496 to 0.842). CONCLUSION: We found that the NCGG-FAT using a tablet PC was reliable in a sample of community-dwelling older adults. The NCGG-FAT might be useful for cognitive screening in population-based samples and outcomes, enabling assessment of the effects of intervention on multidimensional cognitive function among older adults.

DOI： 10.1111/ggi.12014

Doi Takehiko, Makizako Hyuma, Shimada Hiroyuki, Park Hyuntae, Tsutsumimoto Kota, Uemura Kazuki, Suzuki Takao . Brain activation during dual-task walking and executive function among older adults with mild cognitive impairment: a fNIRS study. . Aging Clin Exp Res25 ( 5 ) 539 - 544 2013年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND AND AIMS: Dual-task walking (DTW) is thought to involve activation of the prefrontal cortex in healthy adults and to be affected by cognitive impairment. However, it is unclear whether prefrontal cortex activation is involved in DTW in older adults with mild cognitive impairment. This study examined brain activation during DTW among older adults with mild cognitive impairment using functional near-infrared spectroscopy. METHODS: Sixteen older adults (aged 75.4 +/- 7.2 years, women n = 6) performed gait experiments under normal walking and DTW conditions. We used a design with 60-s blocks consisting of a 10-s rest standing as pre-resting period, a 20-s walking task period, and a 30-s rest standing as post-resting period. Walking speed was measured during a 20-s walking task. Changes in oxy-hemoglobin were measured in the prefrontal area during gait experiments. RESULTS: Walking speed was slower during DTW compared with normal walking (p < 0.001). The oxy-hemoglobin level during DTW was higher than during normal walking (p < 0.001) and was correlated with executive function, as measured by Stroop interference (p < 0.05). CONCLUSION: Our findings indicate that DTW is associated with prefrontal activation among older adults with mild cognitive impairment. The brain activation during DTW was correlated with executive function. Additional studies are necessary to elucidate the effects of cognitive impairment on the association between prefrontal activity and walking under various conditions.

DOI： 10.1007/s40520-013-0119-5

Makizako Hyuma, Shimada Hiroyuki, Doi Takehiko, Park Hyuntae, Yoshida Daisuke, Uemura Kazuki, Tsutsumimoto Kota, Liu-Ambrose Teresa, Suzuki Takao . Poor balance and lower gray matter volume predict falls in older adults with mild cognitive impairment. . BMC Neurol13 102 - 102 2013年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: The risk of falling is associated with cognitive dysfunction. Older adults with mild cognitive impairment (MCI) exhibit an accelerated reduction of brain volume, and face an increased risk of falling. The current study examined the relationship between baseline physical performance, baseline gray matter volume and falls during a 12-month follow-up period among community-dwelling older adults with MCI. METHODS: Forty-two older adults with MCI (75.6 years, 43% women) underwent structural magnetic resonance imaging and baseline physical performance assessment, including knee-extension strength, one-legged standing time, and walking speed with normal pace. 'Fallers' were defined as people who had one or more falls during the 12-month follow-up period. RESULTS: Of the 42 participants, 26.2% (n = 11) experienced at least one fall during the 12-month follow-up period. Fallers exhibited slower walking speed and shorter one-legged standing time compared with non-fallers (both p < .01). One-legged standing time (sec) (standardized odds ratio [95% confidence interval]: 0.89 [0.81, 0.98], p = .02) was associated with a significantly lower rate of falls during the 12-month follow-up after adjusting for age, sex, body mass index, and history of falling in the past year at baseline. Voxel-based morphometry was used to examine differences in baseline gray matter volume between fallers and non-fallers, revealing that fallers exhibited a significantly greater reduction in the bilateral middle frontal gyrus and superior frontal gyrus. CONCLUSIONS: Poor balance predicts falls over 12 months, and baseline lower gray matter densities in the middle frontal gyrus and superior frontal gyrus were associated with falls in older adults with MCI. Maintaining physical function, especially balance, and brain structural changes through many sorts of prevention strategies in the early stage of cognitive decline may contribute to decreasing the risk of falls in older adults with MCI.

DOI： 10.1186/1471-2377-13-102

Shimada Hiroyuki, Makizako Hyuma, Doi Takehiko, Yoshida Daisuke, Tsutsumimoto Kota, Anan Yuya, Uemura Kazuki, Ito Tadashi, Lee Sangyoon, Park Hyuntae, Suzuki Takao . Combined prevalence of frailty and mild cognitive impairment in a population of elderly Japanese people. . J Am Med Dir Assoc14 ( 7 ) 518 - 524 2013年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVE: Preventive strategies for frailty and mild cognitive impairment (MCI) are important for avoiding future functional decline and dementia in older adults. The purpose of this study was to use a population-based survey to ascertain the single and combined prevalence of frailty and MCI and to identify the relationships between frailty and MCI in older Japanese adults. DESIGN: Cross-sectional study. SETTING: General community. PARTICIPANTS: A total of 5104 older adults (aged 65 years or older, mean age 71 years) who were enrolled in the Obu Study of Health Promotion for the Elderly (OSHPE). MEASUREMENTS: Each participant underwent detailed physical and cognitive testing to assess frailty and MCI. We considered the frailty phenotype to be characterized by limitations in 3 or more of the following 5 domains: mobility, strength, endurance, physical activity, and nutrition. Screening for MCI included a standardized personal interview, the Mini-Mental State Examination, and the National Center for Geriatrics and Gerontology-Functional Assessment Tool (NCGG-FAT), which included 8 tasks used to assess logical memory (immediate and delayed recognition), word list memory (immediate and delayed recall), attention and executive function (tablet version of Trail Making Test-part A and B), processing speed (tablet version of digit symbol substitution test), and visuospatial skill (figure selection). RESULTS: The overall prevalence of frailty, MCI, and frailty and MCI combined was 11.3%, 18.8%, and 2.7%, respectively. We found significant relationships between frailty and MCI (the odds ratio adjusted for age, sex, and education was 2.0 (95% confidence interval 1.5-2.5). CONCLUSIONS: Using the OSHPE criteria, we found more participants with MCI than with frailty. The prevalence of frailty and MCI combined was 2.7% in our population. Future investigation is necessary to determine whether this population is at increased risk for disability or mortality.

DOI： 10.1016/j.jamda.2013.03.010

Shimada Hiroyuki, Ishii Kenji, Ishiwata Kiichi, Oda Keiichi, Suzukawa Megumi, Makizako Hyuma, Doi Takehiko, Suzuki Takao . Gait adaptability and brain activity during unaccustomed treadmill walking in healthy elderly females. . Gait Posture38 ( 2 ) 203 - 208 2013年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

This study evaluated brain activity during unaccustomed treadmill walking using positron emission tomography (PET) and [(18)F]fluorodeoxyglucose. Twenty-four healthy elderly females (75-82 years) participated in this study. Two PET scans were performed after 25 min of rest and after walking for 25 min at 2.0 km/h on a treadmill. Participants were divided into low and high step-length variability groups according to the median coefficient of variation in step length during treadmill walking. We compared the regional changes in brain glucose metabolism between the two groups. The most prominent relative activations during treadmill walking compared to rest in both groups were found in the primary sensorimotor areas, occipital lobe, and anterior and posterior lobe of the cerebellum. The high step-length variability group showed significant relative deactivations in the frontal lobe and the inferior temporal gyrus during treadmill walking. There was a significant relative activation of the primary sensorimotor area in the low step-length variability group compared to the high step-length variability group (P = 0.022). Compared to the low step-length variability group, the high step-length variability group exhibited a greater relative deactivation in the white matter of the middle and superior temporal gyrus (P = 0.032) and hippocampus (P = 0.034) during treadmill walking compared to resting. These results suggest that activation of the primary sensorimotor area, prefrontal area, and temporal lobe, especially the hippocampus, is associated with gait adaptability during unaccustomed treadmill walking.

DOI： 10.1016/j.gaitpost.2012.11.008

Makizako Hyuma, Doi Takehiko, Shimada Hiroyuki, Yoshida Daisuke, Takayama Yuko, Suzuki Takao . Relationship between dual-task performance and neurocognitive measures in older adults with mild cognitive impairment. . Geriatr Gerontol Int13 ( 2 ) 314 - 321 2013年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

AIM: The aim of this study was to examine the relationship between dual-task performance and neurocognitive measures in community-dwelling older people with mild cognitive impairment (MCI). METHODS: A total of 98 subjects (mean age 74.8 years, 52.0% female) participated in the study. We compared 36 participants with amnestic MCI (aMCI) with 62 participants with non-amnestic MCI (non-aMCI) on dual-task performance as measured by reaction time responses. The relationships between dual-task performance and multiple domains of neurocognitive functions, including general cognitive function, visual memory, working memory, executive function and processing speed, were examined. RESULTS: Although there were no statistically significant group differences in simple reaction times (P = 0.734), the aMCI group showed significantly slower dual-task reaction times than the non-aMCI group (P = 0.012). Using multiple regression analysis, we found that there was a significant relationship between executive function and dual-task reaction times (beta = 0.298, P = 0.006). CONCLUSION: These results showed that aMCI subjects showed a specific deficit in dual-task performance compared with non-aMCI subjects, and poor dual-task performance was associated with declines in executive function in older people with MCI. Future longitudinal and interventional studies should investigate the use of dual-task testing with varying levels of cognitive demand in older adults at risk of dementia.

DOI： 10.1111/j.1447-0594.2012.00898.x

Doi Takehiko, Shimada Hiroyuki, Makizako Hyuma, Yoshida Daisuke, Shimokata Hiroshi, Ito Kengo, Washimi Yukihiko, Endo Hidetoshi, Suzuki Takao . Characteristics of cognitive function in early and late stages of amnestic mild cognitive impairment. . Geriatr Gerontol Int13 ( 1 ) 83 - 89 2013年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

AIM: The detection of the early stages in amnesic mild cognitive impairment (aMCI) is considered important in diagnosing progression to Alzheimer's disease. The current study sought to investigate differences in cognitive function between control subjects with no memory loss (control), and subjects in the early stage of aMCI (EMCI) and late stage of aMCI (LMCI). METHODS: A total of 100 community-dwelling older adults aged 65 years and over were recruited from 1543 potential subjects. Subjects were classified into three groups based on the degree of objective memory impairment; control (n=29), EMCI (n=34) and LMCI (n=37). Multiple neuropsychological tests were carried out to examine cognitive function. RESULTS: The EMCI individuals showed lower cognitive function relative to controls; not only in logical memory, but also in letter fluency (P<0.05). There were no significant differences in neuropsychological scores between the EMCI and LMCI groups, except for category fluency and logical memory. In addition, the EMCI subjects' logical memory score showed a significant relationship with letter fluency, category fluency and digit span backward test performance (P<0.05). CONCLUSIONS: These results suggest that the application of multiple neuropsychological tests might be useful in diagnosing older adults with EMCI and LMCI.

DOI： 10.1111/j.1447-0594.2012.00865.x

Doi Takehiko, Makizako Hyuma, Shimada Hiroyuki, Yoshida Daisuke, Tsutsumimoto Kota, Sawa Ryuichi, Misu Shogo, Suzuki Takao . Effects of multicomponent exercise on spatial-temporal gait parameters among the elderly with amnestic mild cognitive impairment (aMCI): preliminary results from a randomized controlled trial (RCT). . Arch Gerontol Geriatr56 ( 1 ) 104 - 108 2013年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

Exercise training has been shown to increase physical function in the elderly. However, the effects of exercise on elderly individuals with amnestic aMCI are unclear. The aim of this RCT was to investigate the effect of multicomponent exercise on gait in the elderly. Fifty elderly individuals with aMCI (age: 65-92 years) participated in the study and were randomly allocated to a multicomponent exercise or control group. Multicomponent exercise training was performed for 90 min, twice a week over six months. Gait was analyzed at baseline and after the six month intervention. Gait analysis was performed on an eleven meter walkway at each subject's comfortable walking speed. A miniature tri-axial accelerometer was attached to the L3 spinous process and was used to analyze gait speed, stride length, stride time, and the harmonic ratio (HR) (representing the smoothness of trunk movement). There were no differences in the participant characteristics or gait parameters between the groups at baseline. After adjustment for covariates the multicomponent exercise program had a significant (p<0.05) effect on gait speed, stride length, and the vertical HR. Through improving gait, multicomponent exercise training improves the physical health of the elderly with aMCI.

DOI： 10.1016/j.archger.2012.09.003

Makizako Hyuma, Doi Takehiko, Shimada Hiroyuki, Park Hyuntae, Uemura Kazuki, Yoshida Daisuke, Tsutsumimoto Kota, Anan Yuya, Suzuki Takao . Relationship between going outdoors daily and activation of the prefrontal cortex during verbal fluency tasks (VFTs) among older adults: a near-infrared spectroscopy study. . Arch Gerontol Geriatr56 ( 1 ) 118 - 123 2013年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

This study sought to investigate the relationship between going outdoor daily and prefrontal cortex activation during execution of the VFT using near-infrared spectroscopy (NIRS) in community-dwelling older adults. Blood oxygenation changes in left and right prefrontal cortices were measured in twenty older adults (mean age 76.1 +/- 6.7 years) by NIRS during VFT performance. In this task, participants were required to pronounce as many nouns as possible beginning with the letters "Shi," "I," and "Re." Changes in oxygenated hemoglobin (oxy-Hb) levels during the VFT were compared between two groups defined by the frequency of going outdoors: daily or non-daily within a week. Participants in both groups exhibited significantly increased oxy-Hb levels in the left and right prefrontal cortices during the VFT compared to a resting baseline condition. After controlling for age and gender, there were significant group-by-condition interactions on oxy-Hb levels with less activation during the execution of the VFT over both cortices in the non-daily group (left: F=4.76, p=0.04; right: F=6.32, p=0.02). These findings indicate that going outdoors daily is associated with increased activation in the prefrontal cortices during VFT performance in community-dwelling older adults.

DOI： 10.1016/j.archger.2012.08.017

Uemura Kazuki, Shimada Hiroyuki, Makizako Hyuma, Yoshida Daisuke, Doi Takehiko, Yamada Minoru, Suzuki Takao . Factors associated with life-space in older adults with amnestic mild cognitive impairment. . Geriatr Gerontol Int13 ( 1 ) 161 - 166 2013年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

AIM: Restriction of life-space is associated with physical performance and functional decline in older adults. Little is known about the factors associated with life-space in older adults with amnestic mild cognitive impairment (aMCI). The purpose of this study was to identify factors associated with life-space in older adults with aMCI. METHODS: The study participants were 69 older adults (mean age 74.5 years, males 56.5%) who were identified with aMCI. Life-space mobility was measured using a Japanese translation of the life-space assessment (LSA). Age, sex, cognitive function (general function, executive function and processing speed), physical performance, instrumental activities of daily living status (IADL) and fear of falling (FoF) were measured as potential relevant factors. RESULTS: Univariate analysis showed that the LSA was associated with FoF, sex, physical performance, processing speed and IADL. In the stepwise regression analysis, FoF, processing speed and IADL maintained a significant association with the LSA scores, although sex and physical performance did not reach significance. CONCLUSION: The results suggest that the restrictions of life-space in older adults with aMCI were more affected by the FoF, slower processing speed and restricted IADL than sex or physical performance.

DOI： 10.1111/j.1447-0594.2012.00878.x

Uemura Kazuki, Shimada Hiroyuki, Makizako Hyuma, Doi Takehiko, Yoshida Daisuke, Tsutsumimoto Kota, Anan Yuya, Suzuki Takao . Cognitive function affects trainability for physical performance in exercise intervention among older adults with mild cognitive impairment. . Clin Interv Aging8 97 - 102 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Although much evidence supports the hypothesis that cognitive function and physical function are interrelated, it is unclear whether cognitive decline with mild cognitive impairment influences trainability of physical performance in exercise intervention. The purpose of this study was to examine the association between cognitive function at baseline and change in physical performance after exercise intervention in older adults with mild cognitive impairment. METHODS: Forty-four older adults diagnosed with mild cognitive impairment based on the Peterson criteria (mean age 74.8 years) consented to and completed a 6-month twice weekly exercise intervention. The Timed Up and Go (TUG) test was used as a measure of physical performance. The Mini-Mental State Examination (MMSE), Trail Making Test Part B, Geriatric Depression Scale, baseline muscle strength of knee extension, and attendance rate of intervention, were measured as factors for predicting trainability. RESULTS: In the correlation analysis, the change in TUG showed modest correlations with attendance rate in the exercise program (r = -0.354, P = 0.027) and MMSE at baseline (r = -0.321, P = 0.034). A multiple regression analysis revealed that change in TUG was independently associated with attendance rate (beta = -0.322, P = 0.026) and MMSE score (beta = -0.295, P = 0.041), controlling for age and gender. CONCLUSION: General cognitive function was associated with improvements in physical performance after exercise intervention in subjects with mild cognitive impairment. Further research is needed to examine the effects of exercise programs designed to address cognitive obstacles in older adults with mild cognitive impairment.

DOI： 10.2147/CIA.S39434,

Doi Takehiko, Shimada Hiroyuki, Makizako Hyuma, Lee Sangyoon, Park Hyuntae, Tsutsumimoto Kota, Uemura Kazuki, Yoshida Daisuke, Anan Yuya, Suzuki Takao . Cognitive activities and instrumental activity of daily living in older adults with mild cognitive impairment. . Dement Geriatr Cogn Dis Extra3 ( 1 ) 398 - 406 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

AIMS: This study aimed to identify differences in the implementation of cognitive activities and instrumental activities of daily living (IADLs) between healthy individuals and subjects with mild cognitive impairment (MCI). METHODS: The study included 2,498 cognitively healthy subjects (mean age, 71.2 +/- 5.1 years) and 809 MCI subjects (mean age, 71.8 +/- 5.4 years). The subjects were interviewed regarding their participation in cognitive activities and the implementation of IADLs. RESULTS: We found a significant association between participation in any cognitive activities (p < 0.001), using a bus or a train (p < 0.001), and MCI. After adjusting for covariates, cognitive activity of any type remained significantly associated with MCI (p < 0.005) but not with the implementation of IADLs. CONCLUSIONS: Our study revealed that greater participation in cognitive activity was associated with lower odds of MCI. Participation in cognitive activities may reflect differences between healthy and MCI subjects. To clarify the causal relationship between cognitive activities and MCI, further studies are required.

DOI： 10.1159/000355553,

Makizako Hyuma, Shimada Hiroyuki, Doi Takehiko, Park Hyuntae, Yoshida Daisuke, Suzuki Takao . Six-minute walking distance correlated with memory and brain volume in older adults with mild cognitive impairment: a voxel-based morphometry study. . Dement Geriatr Cogn Dis Extra3 ( 1 ) 223 - 232 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND/AIMS: High fitness levels play an important role in maintaining memory function and delaying the progression of structural brain changes in older people at risk of developing dementia. However, it is unclear which specific regions of the brain volume are associated with exercise capacity. We investigated whether exercise capacity, determined by a 6-min walking distance (6MWD), is associated with measures of logical and visual memory and where gray matter regions correlate with exercise capacity in older adults with mild cognitive impairment (MCI). METHODS: Ninety-one community-dwelling older adults with MCI completed a 6-min walking test, structural magnetic resonance imaging scanning, and memory tests. The Wechsler Memory Scale-Revised Logical Memory and Rey-Osterrieth Complex Figure Tests were used to assess logical and visual memory, respectively. RESULTS: The logical and visual memory tests were positively correlated with the 6MWD (p < 0.01). Poor performance in the 6MWD was correlated with a reduced cerebral gray matter volume in the left middle temporal gyrus, middle occipital gyrus, and hippocampus in older adults with MCI. CONCLUSIONS: These results suggest that a better 6MWD performance may be related to better memory function and the maintenance of gray matter volume in older adults with MCI.

DOI： 10.1159/000354189,

Suzuki Takao, Shimada Hiroyuki, Makizako Hyuma, Doi Takehiko, Yoshida Daisuke, Ito Kengo, Shimokata Hiroshi, Washimi Yukihiko, Endo Hidetoshi, Kato Takashi . A randomized controlled trial of multicomponent exercise in older adults with mild cognitive impairment. . PLoS One8 ( 4 ) e61483 - e61483 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: To examine the effect of multicomponent exercise program on memory function in older adults with mild cognitive impairment (MCI), and identify biomarkers associated with improvement of cognitive functions. METHODOLOGY/PRINCIPAL FINDINGS: Subjects were 100 older adults (mean age, 75 years) with MCI. The subjects were classified to an amnestic MCI group (n = 50) with neuroimaging measures, and other MCI group (n = 50) before the randomization. Subjects in each group were randomized to either a multicomponent exercise or an education control group using a ratio of 1ratio1. The exercise group exercised for 90 min/d, 2 d/wk, 40 times for 6 months. The exercise program was conducted under multitask conditions to stimulate attention and memory. The control group attended two education classes. A repeated-measures ANOVA revealed that no group x time interactions on the cognitive tests and brain atrophy in MCI patients. A sub-analysis of amnestic MCI patients for group x time interactions revealed that the exercise group exhibited significantly better Mini-Mental State Examination (p = .04) and logical memory scores (p = .04), and reducing whole brain cortical atrophy (p<.05) compared to the control group. Low total cholesterol levels before the intervention were associated with an improvement of logical memory scores (p<.05), and a higher level of brain-derived neurotrophic factor was significantly related to improved ADAS-cog scores (p<.05). CONCLUSIONS/SIGNIFICANCE: The results suggested that an exercise intervention is beneficial for improving logical memory and maintaining general cognitive function and reducing whole brain cortical atrophy in older adults with amnestic MCI. Low total cholesterol and higher brain-derived neurotrophic factor may predict improvement of cognitive functions in older adults with MCI. Further studies are required to determine the positive effects of exercise on cognitive function in older adults with MCI. TRIAL REGISTRATION: UMIN-CTR UMIN000003662 ctr.cgi&quest;function&hairsp;=&hairsp;brows&action&hairsp;=&hairsp ;brows&type&hairsp;=&hairsp;summary&recptno&hairsp;=&hairsp;R000004 436&language&hairsp;=&hairsp;J.

DOI： 10.1371/journal.pone.0061483,

Shimada Hiroyuki, Suzuki Takao, Suzukawa Megumi, Makizako Hyuma, Doi Takehiko, Yoshida Daisuke, Tsutsumimoto Kota, Anan Yuya, Uemura Kazuki, Ito Tadashi, Lee Sangyoon, Park Hyuntae . Performance-based assessments and demand for personal care in older Japanese people: a cross-sectional study. . BMJ Open3 ( 4 ) 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVES: To identify appropriate clinical tests for determining the demand for personal care in older Japanese people. DESIGN: Cross-sectional observation study. SETTING: Obu Study of Health Promotion for the Elderly (Obu, Aichi) and Tsukui Ordered Useful Care for Health (241 day-care centres) cohorts in Japan. PARTICIPANTS: A total of 10 351 individuals aged 65 years or older (6791 with personal care and 3560 without personal care) participated in the study. MEASURES: Physical performance tests included grip strength, the chair stand test, walking speed at a comfortable pace, and the timed up-and-go test. Personal care was defined as participants who had been certified in the national social long-term care insurance in Japan. RESULTS: Individuals who received personal care showed a significantly poorer performance than those without personal care for all physical performance tests (p<0.001). Gait speed was the most useful of the physical performance tests to determine the demand for personal care (receiver operating characteristic curve statistics: men, 0.92; women, 0.94; sensitivity: men, 86; women, 90; specificity: men, 85; women, 85). After adjustment for age, sex, cognitive impairment and other physical tests, all physical performance tests were individually associated with the demand for personal care. A slow gait speed (<1 m/s) was more strongly correlated with the demand for personal care than other performance measures (gait speed OR: 5.9; 95% CI: 5.0 to 6.9). CONCLUSIONS: Clinical tests of physical performance are associated with the demand for personal care in older people. Preventive strategies to maintain physical independence may be required in older adults who show a gait speed slower than 1 m/s. Further research is necessary to confirm these preliminary results.

DOI： 10.1136/bmjopen-2012-002424

Makizako Hyuma, Doi Takehiko, Shimada Hiroyuki, Yoshida Daisuke, Tsutsumimoto Kota, Uemura Kazuki, Suzuki Takao . Does a multicomponent exercise program improve dual-task performance in amnestic mild cognitive impairment? A randomized controlled trial. . Aging Clin Exp Res24 ( 6 ) 640 - 646 2012年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND AND AIMS: There has been much interest in exercise interventions as a primary behavioral prevention strategy against cognitive decline. The aim of this study was to evaluate the effect of a multicomponent exercise program on physical and dual-task performances in community-dwelling older adults with amnestic mild cognitive impairment (aMCI). METHODS: Fifty older adults (23 women) with aMCI (mean age, 76 years) were randomized to an intervention (n=25) or a control group (n=25). The intervention group received a multicomponent exercise program for 90 minutes/day, 2 days/week, or 40 times over six months. The multicomponent exercises included aerobic exercise, muscle strength training and postural balance retraining, which was conducted under multi-task conditions to stimulate attention and memory. Participants in the control group attended two health promotion education classes within six months. Physical and dual-task performances were measured before randomization and after six months. Dual-task performances using reaction times with balance and cognitive demands were measured. RESULTS: The improvement effects on dual-task performances with both balance and cognitive demands were not statistically significant: reaction time with balance demand F1,45=3.3, p=0.07, and cognitive demand F1,45=2.6, p=0.12. However, there was a significant group-by-time interaction on maximal walking speed, which decreased significantly in the control group (F1,45=5.9, p=0.02). CONCLUSION: This six-month multicomponent exercise program improved maximal walking speed in older adults with aMCI; however, it did not improve dual-task performances assessed by reaction times.

DOI： 10.3275/8760

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