The purpose of this study was to investigate the relationships among jumping performances and speed parameters during maximum speed phase in sprinters. Twenty-one men sprinters volunteered to participate at the beginning of the preparation training phase. All tests-including 100-m sprint running, squat jump (SJ), countermovement jump (CMJ), drop jump (DJ), 60-second repetitive jump (RJ), standing long jump (SLJ), standing triple jump (STJ), standing quintuple jump (SQJ), and standing 10-stride jump (STENJ)-were done on switching mats. Flight (FT) and contact times (CT) during the vertical jump tests and 10-m split times during 100-m sprint running were measured by a 2-channel precision timing system (PTS) connected to the mats. The trace marking method was used for measuring the stride length (SL) through 60 m in 100-m sprint running. Stride frequency (SF), maximum velocity (Vmax), jump height for all vertical jumps, and lower-body power in DJ and RJ were calculated. Statistical analysis showed that the highest significant correlation was found between Vmax and DJ height (r = 0.69; p < 0.05). However, the lowest significant correlation coefficient was found between SL at maximum velocity phase of sprint running and SJ (r = 0.39; p < 0.05). In conclusion, DJ height is demonstrated to be a more effective way to reflect Vmax during sprint running than the other vertical and horizontal jump tests at the beginning of the preparation training phase.
Purpose: The purpose of this study was to investigate of the acute effects of isoinertial resistance application on sprint, vertical and horizontal jump performance. Material: Volunteered 32 male students were divided into randomized experimental group and control group. Before and after 4-repetition maximal back squat with (for experimental group) or without isoinertial resistance application (for control group), 30 m sprint, vertical squat and countermovement jump tests with both legs, dominant leg, and non-dominant leg, standing broad jump and standing broad countermovement jump tests with both legs were assessed. Wilcoxon t test for pre- and post-test differences within the group, and Mann Whitney U test for pre- and post-test differences between the groups were used. Results: There were no significant differences within the group and between the groups for 30m both legs sprint parameters except pre-test mean stride length between the groups (Z=-2.27; p<0.02). Control group had a significant difference between pre- and post-test dominant leg vertical force (Z=-2.07; p<0.05). There were significant group differences in pre-test non-dominant leg countermovement jump (Z=-2.13; p<0.05), pre- and post-test non-dominant leg stride length (Z=-1.99 and Z=-2.28; p˂0.05, respectively). Conclusions: As a result of the effect of acute isoinertial resistance application to stride length especially to non-dominant stride length it is concluded that long-term isoinertial resistance training can support sprint performance with tolerating stride length imbalance between dominant leg and non-dominant leg.
The purpose of this study was to investigate the effects of additional short and long running stride workouts on acceleration kinematics and jumping performances with respect to the competition phase. Thirteen voluntary male sprinters participated in this study (100 m PB: 10.45-11.30s). The sprinters were separated into three groups [control group (CG), short stride group (SSG), long stride group (LSG)] in a randomised order. Sprinters continued their competition phase training over a two-week period; however, the SSG and LSG run an additional 6 × 40 m three times per week. The pre- and post-training results regarding, acceleration kinematics and jumping performances were compared using the Kruskal Wallis test for several independent samples of intergroup and the Wilcoxon Two Related Samples Test for intragroup differences. If there were intergroup differences, the Mann Whitney U test was used for two related comparisons of the groups. The probability level for statistical significance was set to p≤0.05. Only the LSG showed significant pre- and post-training differences with respect to certain acceleration kinematics (sprint time, sprint velocity, stride length) (Z= −2.023, 2.032, 2.060, respectively; p<0.05). In conclusion, the results of this study show that there is no significant effect of a two-week training regimen involving additional long and short stride running workouts on Turkish sprinters in the competition phase; however, long stride running workouts may be useful for sprinters who have short stride sprint characteristics.
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