Musculoskeletal effects of 5 days of bed rest with and without locomotion replacement training
| Autor: | Joern Rittweger, Petra Frings-Meuthen, Jochen Zange, M. Grunewald, F. P. Wuyts, Gilles Clément, William H. Paloski, Norbert Maassen, Dag Linnarsson, Edwin Mulder, J. Buehlmeier, Bernd Johannes, Vladimir Shushakov |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Adult
Male medicine.medical_specialty Muscle size Sports medicine Physiology Bone markers Economics medicine.medical_treatment Exercise countermeasure Skeletal muscle Isometric exercise Hypokinesia Bed rest Fatigability Endurance capacity Sociology Isometric Contraction Physiology (medical) medicine Humans Orthopedics and Sports Medicine Muscle Strength Muscle Skeletal Exercise Knee extensors business.industry Public Health Environmental and Occupational Health General Medicine musculoskeletal system Exercise Therapy medicine.anatomical_structure Anesthesia Physical therapy Original Article Human medicine medicine.symptom business Bed Rest Locomotion |
| Zdroj: | European journal of applied physiology European Journal of Applied Physiology Europe PubMed Central |
| ISSN: | 1439-6319 |
| Popis: | The present study evaluated the effectiveness of a short and versatile daily exercise regime, named locomotion replacement training (LRT), to maintain muscle size, isometric strength, power, and endurance capacity of the leg muscles following 5 days of head-down tilt (HDT) bed rest. 10 male subjects (age 29.4 +/- A 5.9 years; height 178.8 +/- A 3.7 cm; body mass 77.7 +/- A 4.1 kg) performed, in random order, 5 days of 6A degrees head-down tilt bed rest (BR) with no exercise (CON), or BR with daily 25 min of upright standing (STA) or LRT. Knee extensor and plantar flexor cross-sectional area (CSA) were reduced by 2-3 % following bed rest (P < 0.01) for CON and STA, yet maintained for LRT. Knee extensor isometric strength (MVC) decreased by 8 % for CON (P < 0.05), was maintained for STA, and increased with 12 % for LRT (P < 0.05). Plantar flexor MVC remained unaltered during the study. Maximum jump height declined (similar to 1.5 cm) for all conditions (P < 0.001). Neural activation and knee extensor fatigability did not change with bed rest. Bone resorption increased during BR and neither LRT nor STA was able to prevent or attenuate this increase. LRT was adequate to maintain muscle size and to even increase knee extensor MVC, but not muscle power and bone integrity, which likely requires more intense and/or longer exercise regimes. However, with only some variables showing significant changes, we conclude that 5 days of BR is an inadequate approach for countermeasure assessments. |
| Databáze: | OpenAIRE |
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