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Exercise and transversus abdominis muscle atrophy after 60-d bed rest

Belavý, Daniel L., Gast, Ulf and Felsenberg, Dieter 2017, Exercise and transversus abdominis muscle atrophy after 60-d bed rest, Medicine and science in sports and exercise, vol. 49, no. 2, pp. 238-246, doi: 10.1249/MSS.0000000000001096.

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Title Exercise and transversus abdominis muscle atrophy after 60-d bed rest
Author(s) Belavý, Daniel L.
Gast, Ulf
Felsenberg, Dieter
Journal name Medicine and science in sports and exercise
Volume number 49
Issue number 2
Start page 238
End page 246
Total pages 9
Publisher Lippincott Williams & Wilkins
Place of publication Baltimore, Md.
Publication date 2017-02
ISSN 1530-0315
Keyword(s) spine
muscle
astronauts
spaceflight
back pain
herniation
Summary PURPOSE: This study aimed to investigate atrophy in the deep abdominal muscles, spinal extensors, and the effect of high-load resistive exercise with and without whole-body vibration after 60 d of strict bed rest.

METHODS: Twenty-four subjects underwent 60 d of head-down tilt bed rest and performed either resistive vibration exercise (RVE), resistive exercise only (RE), or no exercise control (2nd Berlin BedRest Study). The thickness of the transversus abdominis, internal oblique, and erector spinae muscles and the area of the multifidus muscle were measured bilaterally via real-time ultrasound. Intention-to-treat analysis was implemented, and P values were adjusted by the false discovery rate method.

RESULTS: At the end of the bed rest, transversus abdominis thickness was reduced by 18.3% in the inactive group (P = 0.00011) with no significant change in the RVE (-4.0%; P = 0.014 vs control) or RE (-5.0%; P = 0.10 vs control) groups. In the inactive subjects, internal oblique thickness reduced by 10.6% (P = 0.0025) and by 7% (P > 0.05) in each of the training groups. The lengthening of the lumbar spine was greatest on day 1 (+7.4%, P = 0.004) and day 2 (+6.3%, P = 0.004; day 54: +4.1%, P = 0.023). A 4.7% reduction of multifidus area was observed on day 1 of bed rest (P = 0.0049) and a 4.2% reduction of erector spinae thickness was observed on day 2 (P = 0.0011). Extensor atrophy and spinal lengthening was not affected by exercise. No significant difference was seen between RVE and RE.

CONCLUSION: Bed rest leads to atrophy of the transversus abdominis and internal oblique muscles. The exercise program, which implemented lower-limb and back extension exercises against shoulder restraints, was able to reduce atrophy seen in transversus abdominis in bed rest.
Language eng
DOI 10.1249/MSS.0000000000001096
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
1106 Human Movement And Sports Science
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, American College of Sports Medicine
Free to Read? No
Free to Read Start Date 2018-03-01
Persistent URL http://hdl.handle.net/10536/DRO/DU:30089006

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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