Effects of External Light Loading in Power-type Strength Training on Muscle Power of the Lower Extremities in Middle-aged Subjects

Abstract

The purpose of this study was to evaluate and compare the effects of training either with a light load or without any load in a 16-week power-type strength training intervention in sedentary middle-aged subjects. A total of 85 subjects participated in the study. In a supervised 22-week training intervention, including 16 weeks of power-type strength training, 42 subjects (Light Load group = LL group) trained with a 1.1 kg weight on each ankle and 43 subjects (No Load group = NOL group) trained without any external load. Subjects were comparable concerning their training attendance, and anthropometric and physiological characteristics. Training effects were evaluated by measuring Vertical Squat Jump (VSJ), 20-metre Running Time (20 mRT), Maximal Anaerobic Cycling Power of leg muscles (MACP), and Maximal Oxygen Uptake (V·O_2max) before and after the intervention. The LL group improved VSJ and MACP significantly (p < 0.05), compared with the NOL group. No difference between the groups was observed in 20 mRT or in V·O_2max. To conclude, the external loads of 2.2 kg, in total, increased the efficiency of power-type strength training in vertical jumps and in anaerobic power in leg muscles, but not in sprint running.

Key words

Middle-aged - progression - sedentary - running technique - squat jump

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