Explosive Strength and Kinesthesia under Acidosis

In this paper an attempt was made to describe the influence of repetitive, exhaustive anaerobic exercises on the ability to differentiate the sense of jumping strength. Regarding all difficulties and questionable data the main aim of this research was to determine if using simple experimental and diagnostic methods it is possible to ascertain if anaerobic fatigue can deteriorate this ability. The experiment was conducted on 32 male subjects, students of physical education aged 22,4±1,3 years (body height – 179,2±12,3 cm, body mass – 79,3±6,3 kg). The measurements were performed with the use of a Kistler 9281C tensometric platform with 9865B amplifier and BioWare™ (2812A1–20 type) acquisition set. Each subject performed 4 vertical jumps to attain maximal height followed by 2 jumps performed with 75% and 2 jumps with 50% of maximum height. Subjects jumped within own rhythm (no metronome) but the jumps were performed in succession. The experimental design related to fatigue consisted of the 30 s Wingate test (Bar–Or 1987) repeated 3 times with 5– min. rest intervals. The resistance for the Wingate test was set at 0.075 kp/kg of bodyweight. The Wingate test performed three times caused significant changes in chosen biochemical mechanical variables. The repeated Wingate test caused a significant decrease in center of mass (COM) lift during maximal vertical jump. The anaerobic exercise did not influence negatively the sense of kinesthetic differentiation of lower limbs. The acidosis revealed a specific mechanism which caused larger errors in case of smaller “expected” force production.