Détail de la notice
Titre du Document
Resistance exercise prevents plantar flexor deconditioning during bed rest
Auteur(s)
BAMMAN M. M. ; HUNTER G. R. ; STEVENS B. R. ; ...
Résumé
Because resistance exercise (REX) and unloading induce opposing neuromuscular adaptations, we tested the efficacy of REX against the effects of 14 d of bed rest unloading (BRU) on the plantar flexor muscle group. Sixteen men were randomly assigned to no exercise (NOE, N = 8) or REX (N = 8). REX performed 5 sets X 6-10 repetitions to failure of constant resistance concentric/eccentric plantar flexion every other day during BRU. One-repetition maximum (1 RM) strength was tested on the training device. The angle-specific torque-velocity relationship across 5 velocities (0, 0.52, 1.05, 1.75, and 2.97 rad.s) and the full range-of-motion power-velocity relationship were assessed on a dynamometer. Torque-position analyses identified strength changes at shortened, neutral, and stretched muscle lengths. Concentric and eccentric contractile work were measured across ten repetitions at 1.05 rad.s1. Maximal neural activation was measured by surface electromyography (EMG). IRM decreased 9% in NOE and improved I % in REX (P < 0.05). Concentric (0.52 and 1.05 rads1, eccentric (0.52 and 2.97 rad.s1), and isometric angle-specific torques decreased (P < 0.05 in NOE, averaging 18%., 17%, and 13%, respectively. Power dropped (P < (1.05) in NOE at three eccentric (21%) and two concentric (14%) velocities. REX protected angle-specific torque and average power at all velocities. Concentric and eccentric strength decreased at stretched (16%) and neutral (17%) muscle lengths (P < 0.
Editeur
Lippincott Williams & Wilkins
Identifiant
PMID : 9372483 ISSN : 0195-9131 CODEN : MSPEDA
Source
Medicine and science in sports and exercise A. 1997, vol. 29, n° 11, pp. 1462-1468 [bibl. : 35 ref.]
Langue
Anglais
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