The mechanical loading and muscle activation of four common exercises used in osteoporosis prevention for early postmenopausal women

Montgomery, G.; Abt, G.; Dobson, C.; Smith, T.; Evans, W.; Ditroilo, M.

Abstract

High impact exercise can reduce postmenopausal bone loss, however stimulus frequency (loading cycles per second) can affect osteogenesis. We aimed to examine the effect of stimulus frequency on the mechanical loading of four common osteoporosis prevention exercises, measuring body acceleration and muscle activation with accelerometry and electromyography (EMG), respectively. Fourteen early postmenopausal women completed randomised countermovement jumps (CMJ), box-drops (BD), heel-drops (HD) and stamp (STP) exercises for continuous and intermittent stimulus frequencies. Sacrum accelerometry and surface electromyography (EMG) of four muscles were recorded. CMJ (mean ± SD: 10.7 ± 4.8 g & 10.0 ± 5.0 g), BD (9.6 ± 4.1 g & 9.5 ± 4.0 g) and HD (7.3 ± 3.8 g & 8.6 ± 4.4 g) conditions generated greater peak acceleration than STP (3.5 ± 1.4 g & 3.6 ± 1.7 g) across continuous and intermittent trials. CMJ and BD generated greater acceleration gradients than STP across continuous and intermittent trials. CMJ generated greater rectus femoris EMG than all other exercises, CMJ and BD generated greater semitendinosus and tibialis anterior EMG than HD across continuous and intermittent trials. CMJ and BD provide greater peak acceleration than STP and remain similar during different stimulus frequencies. CMJ, BD and HD may exceed STP in maintaining postmenopausal bone health.

Citation

Montgomery, G., Abt, G., Dobson, C., Smith, T., Evans, W., & Ditroilo, M. (2019). The mechanical loading and muscle activation of four common exercises used in osteoporosis prevention for early postmenopausal women. Journal of Electromyography and Kinesiology, 44, 124-131. https://doi.org/10.1016/j.jelekin.2018.12.004

• Journal Article Type: Article
• Acceptance Date: Dec 10, 2018
• Online Publication Date: Dec 11, 2018
• Publication Date: 2019-02
• Deposit Date: Jan 9, 2019
• Publicly Available Date: Dec 12, 2019
• Journal: Journal of Electromyography and Kinesiology
• Print ISSN: 1050-6411
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 44
• Pages: 124-131
• DOI: https://doi.org/10.1016/j.jelekin.2018.12.004
• Keywords: Biophysics; Clinical Neurology; Neuroscience (miscellaneous)
• Public URL: https://hull-repository.worktribe.com/output/1190512
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S1050641118302396?via%3Dihub
• Contract Date: Jan 9, 2019