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Titolo:
Effects of functional ability and training on chair-rise biomechanics in older adults
Autore:
Alexander, NB; Gross, MM; Medell, JL; Hofmeyer, MR;
Indirizzi:
Univ Michigan, Dept Internal Med, Div Geriatr Med, Ann Arbor, MI 48109 USAUniv Michigan Ann Arbor MI USA 48109 Geriatr Med, Ann Arbor, MI 48109 USA Univ Michigan, Inst Gerontol, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 st Gerontol, Ann Arbor, MI 48109 USA Univ Michigan, Div Kinesiol, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 iv Kinesiol, Ann Arbor, MI 48109 USA Dept Vet Affairs Med Ctr, Ctr Geriatr Res Educ & Clin, Ann Arbor, MI USA Dept Vet Affairs Med Ctr Ann Arbor MI USA Educ & Clin, Ann Arbor, MI USA
Titolo Testata:
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
fascicolo: 9, volume: 56, anno: 2001,
pagine: M538 - M547
SICI:
1079-5006(200109)56:9<M538:EOFAAT>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIT-TO-STAND; COGNITIVE IMPAIRMENT; ELDERLY ADULTS; YOUNG-WOMEN; PERFORMANCE; STRENGTH; RESIDENTS; BALANCE; HEIGHT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Alexander, NB Univ Michigan, Dept Internal Med, Div Geriatr Med, 1111 CCGCB,1500 E Med Ctr Dr, Ann Arbor, MI 48109 USA Univ Michigan 1111 CCGCB,1500 E Med Ctr Dr Ann Arbor MI USA 48109
Citazione:
N.B. Alexander et al., "Effects of functional ability and training on chair-rise biomechanics in older adults", J GERONT A, 56(9), 2001, pp. M538-M547

Abstract

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-weekstrength-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 hunting 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 shiftaway from impairment in chair-rise ability. and, although the changes are small, they represent how training may reduce rise difficulty.

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Documento generato il 04/04/20 alle ore 02:22:59