期刊
EXPERIMENTAL GERONTOLOGY
卷 47, 期 6, 页码 473-478出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.exger.2012.04.002
关键词
Aging; Muscle quality; Muscle strength; Endurance capacity; Strength training
资金
- FAPERGS Brazilian Government Association
- CAPES Brazilian Government Association
- CNPq Brazilian Government Association
- Spanish Ministry of Health, Institute Carlos III [RD06/013/1003]
- Department of Health of the Government of Navarra [87/2010]
- Government of Spain, Ministry of Economy and Competition [DEP2011-24105]
The purpose of the present study was to investigate the relationship between echo intensity, neuromuscular and cardiorespiratory performances in the elderly. Thirty-one healthy elderly men (65.5 +/- 5.0) participated in this study. Echo intensity of rectus femoris and quadriceps femoris muscle thicknesses was determined by ultrasound images. Lower-body isometric and isokinetic peak torques (60, 180 and 360 degrees(.s-1)), as well as rate of force development were evaluated as strength parameters. In addition, torque per unit of muscle mass was evaluated by the quotient between isometric peak torque of the knee extensors and the quadriceps femoris muscle thickness. The peak oxygen uptake (VO2peak), maximum aerobic workload (W-max), absolute (VT1 and VT2) ventilatory thresholds, as well as workloads at VT1 and VT2 (W-VT1 and W-VT2) were evaluated during a maximal incremental test on a cycle ergometer. There were significant negative correlations between the individual values of echo intensity with the corresponding individual values of isometric and isokinetic peak torques (60, 180 and 360 degrees(.s-1)) (r=-0.48 to r=-0.64; P<0.05), as well as with W-VT1 (r=-0.46) and W-VT2 (r=-0.50) (P<0.05). In addition, significant positive correlations were observed between torque per unit of muscle mass and cardiovascular parameters (r=0.52 to r=0.60; P<0.001). The present results suggest that the echo intensity analysis using computer-aided gray-scale analysis is a low cost, easily accessible, and a safe method to evaluate the muscle quality, and may contribute to the research of neuromuscular and cardiovascular performances in the elderly. (C) 2012 Elsevier Inc. All rights reserved.
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