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High-intensity flywheel exercise and recovery of atrophy after 90 days bed-rest

Belavý, Daniel, Ohshima, Hiroshi, Rittweger, Jörn and Felsenberg, Dieter 2017, High-intensity flywheel exercise and recovery of atrophy after 90 days bed-rest, BMJ open sport and exercise medicine, vol. 3, no. 1, pp. 1-9, doi: 10.1136/bmjsem-2016-000196.

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Title High-intensity flywheel exercise and recovery of atrophy after 90 days bed-rest
Author(s) Belavý, DanielORCID iD for Belavý, Daniel orcid.org/0000-0002-9307-832X
Ohshima, Hiroshi
Rittweger, Jörn
Felsenberg, Dieter
Journal name BMJ open sport and exercise medicine
Volume number 3
Issue number 1
Article ID e000196
Start page 1
End page 9
Total pages 9
Publisher BMJ Publishing Group
Place of publication London, Eng.
Publication date 2017-06-02
ISSN 2055-7647
Keyword(s) exercise
exercise rehabilitation
muscle
Summary Aims To investigate differential muscle atrophy during bed-rest, the impact of a high-intensity concentric-eccentric (flywheel) resistance exercise countermeasure and muscle recovery after bed-rest.

Methods Twenty-five healthy male subjects underwent 90 dayshead-down tilt bed-rest. Volume of individual lower-limb muscles was measured via MRI before, twice during and four times up to 1 year after bed-rest. Subjects were either inactive (n=16) or performed flywheel exercise every third day of bed-rest (n=9). Functional performance was assessed via countermovement jump.

Results
On ‘intent-to-treat’ analysis, flywheel prevented atrophy in the vasti (p<0.001) and reduced atrophy in the hip adductor/extensor adductor magnus (p=0.001) and ankle dorsiflexors/toe flexors (soleus (p<0.001), gastrocnemius medialis (p<0.001), gastrocnemius lateralis (p=0.02), and tibialis posterior with flexor digitorum longus (p=0.04)). Flywheel exercise was not effective for the hamstrings, gracilis, sartorius, peroneals and anterior tibial muscles. Muscle atrophy in vasti, soleus, gastrocnemius medialis, gastrocnemius lateralis and adductor magnus correlated with losses in countermovement jump performance. Muscle volume recovered within 90 days after bed-rest, however long-term after bed-rest, the inactive subjects only showed significantly increased muscle volume versus prebed-rest in a number of muscles including soleus (+4.3%), gastrocnemius medialis (+3.9%) and semimembranosus (+4.3%). This was not associated with greater countermovement jump performance.

Conclusion The exercise countermeasure was effective in preventing or reducing atrophy in the vasti, adductor magnus and ankle dorsiflexors/toe flexors but not the hamstrings, medial thigh muscles or peroneals and dorsiflexor muscles.
Language eng
DOI 10.1136/bmjsem-2016-000196
Field of Research 110602 Exercise Physiology
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, The Authors
Free to Read? Yes
Use Rights Creative Commons Attribution non-commercial licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30099876

Document type: Journal Article
Collections: School of Exercise and Nutrition Sciences
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.