Changes in muscle function in response to 10 days of lower limb unloading in humans

Force‐generating capacity and electromyographic (EMG) activity of the knee extensor muscles were studied before and after short‐term (10 d) unilateral lower limb unloading and during 4 days of recovery. Ten healthy males used crutches to prevent one of their lower limbs from weight‐bearing while mai...

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Bibliographic Details
Published in:Acta physiologica Scandinavica 1996-05, Vol.157 (1), p.63-70
Main Authors: BERG, H. E., TESCH, P. A.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Electromyography
Fundamental and applied biological sciences. Psychology
Humans
Immobilization - physiology
inactivity
Isometric Contraction - physiology
isometric muscle actions
Knee Joint - physiology
Male
maximum voluntary force
Medicin och hälsovetenskap
Muscle, Skeletal - physiology
recovery
Space life sciences
Striated muscle. Tendons
Time Factors
Vertebrates: osteoarticular system, musculoskeletal system
Walking - physiology
Weight-Bearing - physiology
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Summary:Force‐generating capacity and electromyographic (EMG) activity of the knee extensor muscles were studied before and after short‐term (10 d) unilateral lower limb unloading and during 4 days of recovery. Ten healthy males used crutches to prevent one of their lower limbs from weight‐bearing while maintaining joint mobility as well as daily ambulatory activities. Knee extensor torque and quadriceps rectified EMG during maximal voluntary isometric contraction (MVC) was measured repeatedly before and after the intervention. Also, EMG at a fixed submaximal level (100 Nm; 30–45% MVC) and maximal angular velocity (AVmax), during unresisted knee extension, were assessed. Maximum torque decreased (P
ISSN:0001-6772
1365-201X
1365-201X
DOI:10.1046/j.1365-201X.1996.476217000.x