ankle - CLINICAL SCIENCES E ff e c ts of A n k l e P o w e...

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CLINICAL SCIENCES E ff e c t s o f A n k l e P o w e r T r a i n i ng on M ov e m e n t T i m e i n M ob ili t y - I mp a i r e d O l d e r W om e n SANDRA C. W E B B E R 1 2 and MICHELLE M . P O R T E R 1 2 1 Department of Physiology, Faculty of Medicine, University of Manitoba, Winnipeg, Manitoba, CANADA; and 2 Health Leisure and Human Performance Research Institute, Faculty of Kinesiology and Recreation Management, University of Manitoba, Winnipeg, Manitoba, CANADA ABSTRACT WEBBER, S. C. and M . M . PORTER. Effects of Ankle Power Training on Movement Time in Mobility-Impaired Older Women. Med. Sci. Sports Exerc, Vol. 42, No. 7, pp. 1233-1240, 2010. Purpose: Reduced abilities to generate power put older adults at risk in situations that demand rapid movements. Slower movement times are associated with greater risk of falling and of being involved in a motor vehicle crash. The purpose of this study was to determine the effects of power training on foot movement time and. secondarily, on ankle strength and power in mobility-impaired older women. Methods: Fifty mobility-impaired women (70-88 yr) trained twice per week for 12 wk in one of three groups (weights, elastic bands, or placebo control). All groups performed seated warm-up exercises, followed by either concentric dorsiflexion (DF) and plantarflexion (PF) resistance exercises (weights and bands) performed "as fast as possible" or upper body flexibility exercises (control). Foot reaction/movement time and ankle DF and PF peak torque (30°s ) and peak power (90°-s -1 ) were measured before and after training. Results: Participants who trained with elastic bands demonstrated improvements in movement time (decreased by 24 ins or 12%, P = 0.003). All groups demonstrated improvements in DF and PF strength and power, which were not statistically different. Conclusions: High-velocity/low-load (elastic bands) training improved movement time, which may have important implications in circumstances when rapid generation of torque is required (e.g. . to avoid a fall or prevent a vehicle crash). Elastic bands are relatively inexpensive and provide a practical form of training that could be considered in programs designed for older adults with mobility limitations. Key Words: RESPONSE TIME, AGING, RESISTANCE TRAINING, HIGH VELOCITY, CONCENTRIC L oss of muscle mass and muscle weakness are closely associated with functional decline, loss of
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This note was uploaded on 02/17/2011 for the course HK 490 taught by Professor Reidtky during the Fall '10 term at Purdue.

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ankle - CLINICAL SCIENCES E ff e c ts of A n k l e P o w e...

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