The effect of four weeks of plyometric training on reactive strength index and leg stiffness is sport dependent.

Background: Plyometric exercises are often used to develop lower limb strength and performance-related biomechanics such as leg stiffness. However, the effectiveness of plyometric training may depend on participants' own training and performance demands. The purpose of this study was to examine the effect of plyometric training on Reactive Strength Index (RSI) and leg stiffness (Kleg) on young athletes of different sports.

Effect of acupuncture in physiological parameters and endurance running performance.

Background: Few studies have examined the effect of acupuncture (AC) treatment in aerobic capacity and endurance performance in healthy adults. Thus, the aim of the present study was to evaluate the effects of AC on selected physiological parameters and 3 km running performance.

Methods: Twenty-four healthy subjects with low to moderate aerobic capacity participated in the study and randomly assigned in two groups: AC group (ACG - N.