Eur J Appl Physiol Occup Physiol. 1995;71(4):332-6.
The role of metabolites in strength training. I. A comparison of eccentric and
concentric contractions.
Smith RC, Rutherford OM.
Department of Physiology, St. Mary's Hospital Medical School, London, UK.
This study examined the role of high forces versus metabolic cost in the
adaptations following strength training. Ten young, healthy male and female
subjects trained one leg using concentric (CL) and the other using eccentric
(EL) contractions of the quadriceps muscle for 20 weeks. EL used weights which
were 35% higher than those used for CL. Isometric strength, and the
length:tension and force:velocity relationship of the muscle were measured
before and after training. Muscle cross-sectional area (CSA) was measured near
the knee and hip using computed tomography. Increases in isometric strength were
greater for CL compared to EL, the difference being significant with the knee at
1.57 rad (90 degrees) [mean (SD), 43.7 (19.6)% vs 22.9 (9.8)%, respectively; P =
0.01]. Increases in isokinetic strength tended to be larger for EL, although the
differences were not significant. Significant increases in CSA occurred near the
hip for both EL and CL. These results suggest that metabolic cost, and not high
forces alone, are involved in the stimuli for muscle hypertrophy and strength
gains following high-resistance training.
Publication Types:
Clinical Trial
Controlled Clinical Trial
PMID: 8549576 [PubMed - indexed for MEDLINE]
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