Abstract
The purpose of this study is to investigate the relationship between repeated sprint performance and velocity values during loaded-squat jump exercise. In accordance with this purpose, 23 kickboxing athletes (age: 21,1 ± 2,10 years; height: 178,7±5,01 cm; weight: 70,8±7,85 kg) participated voluntarily in this study. Participants were performed to repeated sprint test and loaded-squat jump exercise by using an external load corresponding to 40 % of their body weight and velocity parameters were obtained as mean velocity (MV), mean propulsive velocity (MPV) and peak velocity (PV). Descriptive statistics were used in analysis of data. In addition, Spearman Correlation Analysis was used to determine the relationship between repeated sprint performance and velocity values during loaded-squat jump exercise. According to the analysis results; while total running times and fatigue index values in repeated sprint test of subjects were obtained as 52.4 (±1.96 sec) and 4.98 (±2.36%) respectively; velocity values during loaded-squat jump exercise were obtained as 1.38 (±,07 m/s-1) for MP, 1.54 (±,10 m/s-1) for MPV, and 2.58 (±,15 m/s-1) for PV. In addition, it was determined that there was no any statistically significant difference between MP (r= - ,148; r= - ,072, p>0.05, respectively), MPV (r= - ,335; r= - ,150, p>0.05, respectively), PV (r= ,010; r= - ,034, p>0.05 respectively) and total running time and fatigue index values in repeated sprint test. As a result, it can be suggested that velocity values during loaded squat jump exercise have no statistically significant effect on repeated sprint performance.
Highlights
Squat jumping is an exercise commonly used in testing lower-body muscle strength and showing rapidly acceleration competency of the body from a resting position which is important in workout and many branches of sports (Samozino et al, 2008)
Physical features of the subjects are given in table 1, running times in repeated sprint test are given in table 2 and descriptive statistical results showing velocity values which were acquired during concentric phase of loaded squat jump move applied by using free-weights with an external load corresponding to 40% of the subjects’ body weights are given in table 3
The purpose of this study is examining the relationship between running times in repeated sprint test and velocity values during loaded squat jump exercise of kickboxing athletes
Summary
Squat jumping is an exercise commonly used in testing lower-body muscle strength and showing rapidly acceleration competency of the body from a resting position which is important in workout and many branches of sports (Samozino et al, 2008). Squat jumping exercise is applied in order to evaluate an individual’s strength competency performed by using different external loads (Garcia-Ramos et al, 2016; Jimenez-Reyes et al, 2017) and it is generally applied by using both a free-weight barbell and smith machine (Jimenez-Reyes et al, 2017; Stone et al, 2003). As known in physical science, jumping height is directly related to take-off velocity and many authors assess take-off velocity in order to determine vertical jumping performance (Luhtanen & Komi, 1978; Kollias et al, 2001; Moir et al, 2008). The velocity of a muscle in the event of concentric contraction is inversely correlated to the applied external load jel.ccsenet.org
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