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Titolo:
How quickly can healthy adults move their hands to intercept an approaching object? Age and gender effects
Autore:
DeGoede, KM; Ashton-Miller, JA; Liao, JM; Alexander, NB;
Indirizzi:
Univ Michigan, MEAM, Dept Mech Engn, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 t Mech Engn, Ann Arbor, MI 48109 USA Univ Michigan, Dept Biomed Engn, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 Biomed Engn, 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, Dept Internal Med, Ann Arbor, MI 48109 USA Univ Michigan Ann Arbor MI USA 48109 nternal Med, Ann Arbor, MI 48109 USA Ann Arbor VA Med Ctr GRECC, Ann Arbor, MI USA Ann Arbor VA Med Ctr GRECC Ann Arbor MI USA Ctr GRECC, Ann Arbor, MI USA
Titolo Testata:
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
fascicolo: 9, volume: 56, anno: 2001,
pagine: M584 - M588
SICI:
1079-5006(200109)56:9<M584:HQCHAM>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRACTURES; MOVEMENTS; FALLS; TIME;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Ashton-Miller, JA Univ Michigan, MEAM, Dept Mech Engn, GGB 3208, Ann Arbor, MI 48109 USA Univ Michigan GGB 3208 Ann Arbor MI USA 48109 48109 USA
Citazione:
K.M. DeGoede et al., "How quickly can healthy adults move their hands to intercept an approaching object? Age and gender effects", J GERONT A, 56(9), 2001, pp. M584-M588

Abstract

Background. The upper extremities are often used to protect the head and turso from impact with an object or with the ground. We tested the null hypotheses that neither age nor gender would affect the time required for healthy adults to move their upper extremities into a protective posture. Methods. Twenty young (mean age 25 years) and twenty older (mean age 70 years) volunteers. with equal gender representation, performed a seated arm-movement task under three conditions: Condition 1, in which subjects were instructed to raise the hands upon cue as quickly as possible from thigh level to a shoulder height target, Condition 2, in which subjects were instructed as in Condition 1 with the addition of intercepting a swinging pendulum at the prescribed hand target; and Condition 3, in which subjects were instructed as in Condition 2 but were asked to wait as long as possible before initiating hand movement to intercept the pendulum. Arm movements were quantified using standard kinematic techniques. Results. Age (p < .01) and gender (p < .05) affected hand movement times. In Conditions 1 and 2, the older women required 20% longer movement times than the other subject groups (335 vs 279 milliseconds; p < .01). In Condition 3, shorter movement times were achieved by young men (20%; p = .002) andolder women (10%; p = .056) as compared with their respective performance in Conditions 1 and 2 because they did not fully decelerate their hands. The other groups slowed their movements in Condition 3. Conclusions. Age, gender, and perceived threat significantly affected movement times. However, even the slowest movement times were well within the time available to deploy the hands in a forward fall to the ground.

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Documento generato il 11/07/20 alle ore 17:44:58