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Characterization of the human quadriceps muscle in active elders
STEVENS JE; BINDER MACLEOD S; SNYDER MACKLER L
ARCH PHYS MED REHABIL , 2001, vol. 82, n° 7, p. 973-978 Doc n°: 103928 Localisation : Documentation IRR Descripteurs : AB1 - ETUDES GENERALES - MUSCLES, MA - GERONTOLOGIE
Article consultable sur : http://www.archives-pmr.org
OBJECTIVE: To compare muscle activation deficits and muscle physiology in older versus younger adults. DESIGN: A maximal volitional isometric contraction of the quadriceps muscle with burst-superimposition was used to assess strength and activation. In addition, force-frequency testing during fresh, fatigue, and recovery conditions and electrically elicited fatigue testing were performed. SETTING: Muscle performance laboratory. PATIENTS: Healthy, active young (age range, 20-28 yr) and older (age range, 66-83 yr) subjects. MAIN OUTCOME MEASURES: Torque production, activation of the quadriceps, F50 values from the force-frequency relationships (frequency at which 50% of the maximum normalized force is produced), and the average amount of fatigue. RESULTS: Older subjects were weaker (574.4 +/- 156 N) than younger subjects (900.9 +/- 295 N) and had significantly greater deficits in central activation in the quadriceps muscles (elderly = 95.5% activation; younger = 98.1% activation). The force-frequency curves for the elderly were to the left of the younger subjects for all 3 testing conditions. Aged muscles fatigued to the same extent as younger muscle (young = 49.8% +/- 2.6%, elderly = 51.1% +/- 2.8%). CONCLUSIONS: These results can be used to modify high-intensity strength training protocols designed to optimize sustainable strength gains in the elderly during rehabilitation. Langue : ANGLAIS Identifiant basis : 2002219901 |
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