Abstract
OBJECTIVE: To determine the effect of aerobic retraining as rehabilitation after short-term leg immobilization on leg strength, leg work capacity, leg lean mass, leg muscle fibre type composition and leg capillary supply, in young and older men.
SUBJECTS AND DESIGN: Seventeen young (23 ± 1 years) and 15 older (68 ± 1 [standard error of the mean; SEM] years) men had one leg immobilized for 2 weeks, followed by 6 weeks' bicycle endurance retraining.
METHODS: Maximal voluntary contraction, leg work capacity (Wmax), and leg lean mass by dual energy X-ray absorptiometry were measured at inclusion, after immobilization and after 3 and 6 weeks' retraining. Muscle biopsies were evaluated for fibre type, fibre area, and capillarization.
RESULTS: Immobilization decreased maximal voluntary contraction (-28 ± 6% and -23 ± 3%); Wmax (-13 ± 5% and -9 ± 4%) and leg lean mass (only in young, -485 ± 105 g) in young and older men, respectively. Six weeks' retraining increased maximal voluntary contraction (34 ± 8% and 17 ± 6%), Wmax (33 ± 5% and 20 ± 5%) and leg lean mass (only in young 669 ± 69 g) in young and older men, respectively, compared with the immobilized value.
CONCLUSION: Short-term leg immobilization had marked effects on leg strength, and work capacity and 6 weeks' retraining was sufficient to increase, but not completely rehabilitate, muscle strength, and to rehabilitate aerobic work capacity and leg lean mass (in the young men).
Original language | English |
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Journal | Journal of Rehabilitation Medicine |
Volume | 47 |
Issue number | 6 |
Pages (from-to) | 552-560 |
Number of pages | 9 |
ISSN | 1650-1977 |
DOIs | |
Publication status | Published - Jun 2015 |