Reproducibility and changes in twitch properties associated with age and resistance training in young and elderly women

Scandinavian Journal of Medicine & Science in Sports
Jack CannonFrank E Marino

Abstract

We compared knee extensor twitch contractile properties (TP) between nine young women (YW, 20-30 years) and 10 elderly women (63-78 years) and examined changes associated with resistance training in addition to measurement reproducibility. Data were obtained on two occasions 3 weeks apart after which subjects performed bilateral leg extension and bilateral leg curl exercises 3 days/week for 10 weeks. TP demonstrated moderate to good reproducibility in both age groups with Pearson's r and the intra-class correlation coefficient ranging from 0.67 to 0.85 (P<0.05) and the technical error of the measurement ranging from 4.2% to 7.8%. Pre-training, peak twitch torque, rate of torque development, and the rate of relaxation were 24-32% greater for the YW than EW (P<0.05). Time to peak torque, half-relaxation time, and contraction duration were not significantly different between age groups. Post-training, changes of 2.6-6.1% were observed in TP; however, these changes were not significant in either group. These data suggest the presence of an age-associated slowing in the rate of muscle contraction. Furthermore, the lack of change in TP in both groups suggests resistance training failed to alter contractile function. However, these fi...Continue Reading

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Citations

Jun 17, 2009·Journal of Strength and Conditioning Research·Eric J DrinkwaterJack Cannon
Dec 20, 2012·Journal of Strength and Conditioning Research·Raphael F ZorySerresse Olivier
May 9, 2014·Experimental Gerontology·Nathaniel D M JenkinsJoel T Cramer
Dec 5, 2013·Clinical Physiology and Functional Imaging·Nathaniel D M JenkinsJoel T Cramer
Mar 6, 2013·Scandinavian Journal of Medicine & Science in Sports·G M MinettF E Marino
Apr 22, 2015·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Nick ClarkeJoel R Krentz
Jun 9, 2019·European Journal of Applied Physiology·John O OsborneGeoffrey M Minett

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