Comparison of EMG activity in hip and thigh muscles during static bed exercises and sit-to-stands in older adults

Authors: Gavin, J., Burgess, L., Immins, T. and Wainwright, T.W.

Journal: Isokinetics and Exercise Science

Publisher: IOS Press

ISSN: 0959-3020

OBJECTIVE: To compare EMG activity of the hip and thigh muscles during traditional static bed exercises and the sit-to-stand exercise in healthy older adults. METHODS: Twenty-four healthy, older adults (8 male; age 65±7 yrs) performed four static rehabilitation exercises: isometric contractions of the gluteal, abductor, inner quadriceps and quadriceps (ten, ~5 s submaximal contractions, with 60 rests), and the sit-to-stand test. Electromyographic (EMG) activity was recorded from the rectus femoris, vastus medialis, gluteus medius, biceps femoris and gluteus maximus, and root mean square-processed (RMS) in this observational preliminary study. Handgrip strength and 10 m walking speed represented participant characteristics.

RESULTS: Hip and thigh muscles were activated differently between the isometric bed and sit-to-stand exercises. Greatest RMS activity was shown in the chair rising phase of the sit-to-stand exercise. No bed exercise exceeded the muscle RMS activity required to perform a sit-to-stand, and only for sit-to-stands were all muscles activated over 40% of maximal; the level required to stimulate muscle strength adaptation.

CONCLUSIONS: Functional daily activities, such as sit-to-standing, produce greater muscle activity than static bed exercises in healthy older adults. Sit-to-stands should be included in exercise and rehabilitation programs for older adults to evoke sufficient levels of neuromuscular activation for muscle strength adaptation.

The data on this page was last updated at 04:58 on May 27, 2019.