Does functional performance and upper body strength predict upper extremity reaction and movement time in older women?

Legg, Hayley S ORCID: 0000-0002-4995-2091, Arnold, Cathy M, Trask, Catherine and Lanovaz, Joel L (2021) Does functional performance and upper body strength predict upper extremity reaction and movement time in older women? Human Movement Science, 77. p. 102796. doi:10.1016/j.humov.2021.102796

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Background Reaction time to initiate upper limb movement and movement time to place hands on the landing surface may be important factors in forward fall landing and impact, contributing to injury reduction. The aim was to investigate the relationship of physical function and upper body strength to upper limb reaction and movement time in older female participants. Methods 75 female participants (72 ± 8 yrs) performed 5 arm response trials. Reaction time (signal to initiation of movement), and movement time (initial movement to contact), were collected using 3D motion capture. Additional variables were: handgrip; sit-to-stand; shoulder flexion and elbow extension strength measured by hand-held dynamometry; one-legged balance; fall risk; and physical activity scores. Prediction variables for reaction and movement time were determined in separate backward selection multiple regression analyses. Significance was set at P < 0.05. Findings Significant regression equations for RT (r2 = 0.08, P = 0.013) found a relationship between stronger handgrip (Beta = −0.002) and faster reaction time, accounting for 8% variance. For movement time (r2 = 0.06, P = 0.036) greater shoulder flexion strength (Beta = −0.04) was related to faster movement time, explaining 6% variance. Stronger SF strength was related to a decrease in MT by 4%. Discussion A relationship between arm strength measures and faster upper body reaction and movement time was shown, with 10–20% higher strength associated with a 5% faster response time. Even though this was a relatively weak relationship, given that strength is a modifiable component this provides a potential avenue for future intervention efforts. This in turn could have an impact on forward fall landing and potential reduction of injury risk.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Fall prevention; Aging; Upper limb
Subjects: Q Science > QP Physiology
Divisions: Schools and Research Institutes > School of Education and Science
Research Priority Areas: Health, Life Sciences, Sport and Wellbeing
Depositing User: Rhiannon Goodland
Date Deposited: 02 Nov 2023 14:23
Last Modified: 06 Nov 2023 12:19

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