Age and Gender Effects on Reciprocal Moment Ratios in Knee Muscle Contractions

in Journal of Aging and Physical Activity
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Fifteen young and 17 older females (29.5 ± 4.6 and 58.2 ± 6.1 years of age) and 14 young and 15 older males (27.2 ± 3.3 and 56.5 ± 5.7 years) volunteered as subjects for this study to investigate age and gender effects on reciprocal moment ratios in knee muscle groups. Subjects completed 4 consecutive maximal contractions of dominant knee extensor and flexor muscles at 60°/s for the concentric (CON) and eccentric (ECC) torque tests and 20 consecutive maximal contractions at 180°/s and 1207s for the CON and ECC torque-work tests, respectively. Subjects also performed 5-s isometric (ISM) contractions at a 60° angle and 07s velocity for knee extensors. The results demonstrated that (a) ECC strength, particularly in males, was less influenced than ISM and CON strength by aging factors, (b) older groups, particularly females, possessed greater capacity for ECC muscle action than CON compared to other groups, and (c) older groups, particularly females, had a lower ratio of CON extensors:ECC flexors and a greater ratio of ECC extensors:CON flexors than young groups.

Hakan Gür and Selçuk Küçükoglu are with the Department of Sports Medicine, University of Uludag, 16059 Bursa, Turkey.

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