rees -     367 The authors are with the School of...

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Unformatted text preview:     367 The authors are with the School of Leisure, Sport and Tourism, University of Technology, Sydney, Lindfiled NSW, 2070 Australia. Journal of Aging and Physical Activity, 2007,  15 , 367-381  © 2007 Human Kinetics, Inc. ORIGINAL RESEARCH Effects of Vibration Exercise on Muscle Performance and Mobility in an Older Population Sven Rees, Aron Murphy, and Mark Watsford This study was designed to investigate the effects of vibration on muscle per- formance and mobility in a healthy, untrained, older population. Forty-three participants (23 men, 20 women, 66–85 y old) performed tests of sit-to-stand (STS), 5- and 10-m fast walk, timed up-and-go test, stair mobility, and strength. Participants were randomly assigned to a vibration group, an exercise-without- vibration group, or a control group. Training consisted of 3 sessions/wk for 2 mo. After training, the vibration and exercise groups showed improved STS (12.4%, 10.2%), 5-m fast walk (3.0%, 3.7%), and knee-extension strength (8.1%, 7.2%) compared with the control ( p < 0.05). Even though vibration training improved lower limb strength, it did not appear to have a facilitatory effect on functional- performance tasks compared with the exercise-without-vibration group. Compa- rable mobility and performance changes between the experimental groups suggest that improvements are linked with greater knee-extension strength and largely attributed to the unloaded squats performed by both exercise groups. Key Words : whole-body vibration, elderly, functional performance, strength Aging is accompanied by sarcopenia, a decrease in muscle mass (Evans, 1995). The loss in muscle mass is directly linked to a decline in muscle strength and power. This decline can affect many aspects of physical function such as walking and rising from a chair (Brown, Sinacore, & Host, 1995). In addition, muscle weakness and reduced ability to produce rapid force are considered two of the most common risk factors for increased risk of falls and loss of functional independence (Taaffe & Marcus, 2000; Tinetti, Speechley, & Ginter, 1988). To date, numerous studies have demonstrated that resistance training can increase muscle mass, strength, and power along with physical function (Fiatarone et al., 1990; Lamoureux, Sparrow, Murphy, & Newton, 2003). Accordingly, progressive resistance-training interventions are consistently prescribed to counteract age-related sarcopenia. An alternative exercise stimulus, whole-body vibration (WBV), has recently emerged as a potential training intervention that could positively influence the muscular system in older adults, but research investigating WBV exercise in the older population is sparse. 368 Rees, Murphy, and Watsford  WBV exercise involves standing on a platform that oscillates at a particular frequency and amplitude. Vibrations stimulate the neuromuscular system, activating muscles through spinal reflexes. These rapid vibrations stimulate muscle spindles, activating 1a...
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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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rees -     367 The authors are with the School of...

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