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Effects of functional ability and training on chair-rise biomechanics in older adults.
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Effects of functional ability and training on chair-rise biomechanics in older adults.

著者: NB Alexander 附属: Geriatric Research, Education and Clinical Center, Department of Veterans Affairs Medical Center, Ann Arbor, MI 48109, USA. nalexand@umich.edu; MM Gross; JL Medell; MR Hofmeyer
版本/格式: 文章 文章 : 英语
刊登在:The journals of gerontology. Series A, Biological sciences and medical sciences, 2001 Sep; 56(9): M538-47
数据库:取自MEDLINE®/PubMed®,这是美国医学图书馆的一个数据库。
其它数据库: ArticleFirst
提要:
BACKGROUND: Difficulty in rising from a chair is common in older adults and may be assessed by examining the biomechanics of the rise. The purposes of this study were (i) to analyze the biomechanics of rise performance during chair-rise tasks with varying task demand in older adults with varying rise ability and (ii) to determine whether a strength-training program might improve chair-rise success and alter  再读一些...
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文件类型: 文章
所有的著者/提供者: NB Alexander 附属: Geriatric Research, Education and Clinical Center, Department of Veterans Affairs Medical Center, Ann Arbor, MI 48109, USA. nalexand@umich.edu; MM Gross; JL Medell; MR Hofmeyer
ISSN:1079-5006
语言注释: English
专有的标识符 117698727
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摘要:

BACKGROUND: Difficulty in rising from a chair is common in older adults and may be assessed by examining the biomechanics of the rise. The purposes of this study were (i) to analyze the biomechanics of rise performance during chair-rise tasks with varying task demand in older adults with varying rise ability and (ii) to determine whether a strength-training program might improve chair-rise success and alter chair-rise biomechanics, particularly under situations of increased task demand. METHODS: A training group (n = 16; mean age, 82 years) completed a 12-week strength-training regimen while a control group (n = 14; mean age, 84 years) participated in a seated flexibility program. Outcomes included the ability to complete seven chair-rise tasks, and, if the chair-rise tasks were successful, the biomechanics of these rises. Chair-rise task demand was increased by lowering the seat height, restricting the use of hands, increasing rise speed, and limiting foot support. RESULTS: At baseline, increased chair-rise task demand generally required increased task completion time, increased anterior center of pressure (COP) placement, increased momentum, increased hip flexion, and increased hip and knee torque output. Those unable to rise at 100% knee height without the use of their hands (task NH-100), compared with those able to rise during task NH-100, followed this pattern in requiring increased time, more anterior placement of the COP, and increased hip flexion to rise in the least demanding tasks allowing the use of hands. However, the unable subjects generated less momentum and knee torque in these tasks. At 12 weeks, and compared with baseline and controls, the training group demonstrated changes in chair-rise biomechanics but no significant changes in rise success. The training subjects, as compared with the controls, maintained a more posterior COP, increased their vertical and horizontal momentum, maintained their knees in greater extension, and maintained their knee-torque output. CONCLUSIONS: These data demonstrate that subtle yet significant changes can be demonstrated in chair-rise performance as a result of a controlled resistance-training program. These biomechanical changes may represent a shift away from impairment in chair-rise ability, and, although the changes are small, they represent how training may reduce rise difficulty.

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