Skip to main content

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.

Authors

G. Montgomery

Profile Image

Dr Grant Abt G.Abt@hull.ac.uk
Reader in Sport and Exercise Physiology and Head of Department for Sport, Health and Exercise Science

T. Smith

W. Evans

M. Ditroilo



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.

Journal Article Type Article
Publication Date 2019-02
Journal Journal of Electromyography and Kinesiology
Print ISSN 1050-6411
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 44
Pages 124-131
APA6 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. doi:10.1016/j.jelekin.2018.12.004
DOI https://doi.org/10.1016/j.jelekin.2018.12.004
Keywords Biophysics; Clinical Neurology; Neuroscience (miscellaneous)
Publisher URL https://www.sciencedirect.com/science/article/pii/S1050641118302396?via%3Dihub

Files

Article (662 Kb)
PDF

Copyright Statement
© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/



You might also like



Downloadable Citations