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European Journal of Applied Physiology
Published in: European Journal of Applied Physiology 4-5/2004

01-08-2004 | Short Communication

Human adductor muscles atrophy after short duration of unweighting

Authors: Shino Kawashima, Hiroshi Akima, Shin-ya Kuno, Atsuaki Gunji, Tetsuo Fukunaga

Published in: European Journal of Applied Physiology | Issue 4-5/2004

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Abstract

The purpose of this study was to investigate the effect of 20 days of bed rest (BR) on the physiological cross-sectional area (PCSA) of the adductor (AD) muscle group. Five healthy men and five healthy women were kept on a horizontal bed for 20 days. To calculate the PCSA of the AD muscle group, transaxial magnetic resonance imaging of the right thigh was acquired four times for each of the subjects: (1) pre BR, (2) on the tenth day of BR, (3) post BR, and (4) 1 month after BR. Overall, the PCSA measurements of the AD muscle group and its individual muscles were significantly decreased on the tenth day of BR and at post BR; however, they had recovered to the baseline within 1 month of the reambulation period. The amount and pattern of relative change in the PCSA measurements of the AD muscle group were similar to those of the knee extensor (KE) and knee flexor (KF) muscle groups studied previously. These results suggested that the AD muscle group showed an atrophic response that was similar to the KE and KF muscle groups after unweighting; therefore, we should pay much more attention to the AD muscle group when considering countermeasures for future human spaceflight projects.
Literature
Akima H, Kuno S, Suzuki Y, Gunji A, Fukunaga T (1997) Effects of 20 days of bed rest on physiological cross-sectional area of human thigh and leg muscles evaluated by magnetic resonance imaging. J Gravit Physiol 4:S15–S21PubMed
Akima H, Kawakami Y, Kubo K, Sekiguchi C, Ohshima H, Miyamoto A, Fukunaga T (2000) Effect of short duration of spaceflight on thigh and leg muscle volume. Med Sci Sports Exerc 32:1743–1747CrossRefPubMed
Akima H, Kinugasa R, Kuno S (2004) Recruitment of the thigh muscles during sprint cycling by muscle functional magnetic resonance imaging. Int J Sports Med (in press)
Bloomfield SA (1997) Changes in muscloskeletal structure and function with prolonged bed rest. Med Sci Sports Exerc 29:197–206PubMed
Castro MJ, Apple DF Jr, Rogers S, Dudley GA (2000) Influence of complete spinal cord injury on skeletal muscle mechanics within the first 6 months of injury. Eur J Appl Physiol 81:128–131PubMed
Fortney SM, Schneider VS, Greenleaf JE (1996) The physiology of bed rest. In: Fregly MJ, Blatteis CM (eds) Handbook of physiology. Oxford University Press, New York, pp 889–939
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Metadata
Title
Human adductor muscles atrophy after short duration of unweighting
Authors
Shino Kawashima
Hiroshi Akima
Shin-ya Kuno
Atsuaki Gunji
Tetsuo Fukunaga
Publication date
01-08-2004
Publisher
Springer-Verlag
Published in
European Journal of Applied Physiology / Issue 4-5/2004
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-004-1184-4

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