Explosive leg strength and leg stiffness as predictors of 100m sprint performance in elite Croatian sprinters (CROSBI ID 524755)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Vučetić, Vlatko ; Babić, Vesna ; Marković, Goran
engleski
Explosive leg strength and leg stiffness as predictors of 100m sprint performance in elite Croatian sprinters
Introduction It has been demonstrated that sprint performance is dependent on several qualities of the muscular system, explosive leg strength in particular1, 5. In addition, it has been suggested that the stiffness of the legs also represents an important factor responsible for successful sprinting performance, particularly in the maximum velocity sprint phase1, 2. Leg stiffness is one of the elastic components of the muscle-tendon complex behavior that influences the mechanics and kinematics of body's interaction with the ground3. Both explosive leg strength and stiffness can be successfully determined by means of various jump tests1, 3. The purpose of this study was to relate, in national level track sprinters, explosive leg strength and leg stiffness to the 100m sprint performance. Methods Eleven regional to national level male sprinters (100m sprint performance: 10.9 ± ; ; 0.4s (mean ± ; ; SD) ; range: 10.3- 11.5s) participated in the study. Best 100m sprint performance (R100) during an official competition in the present season for each sprinter was considered as a criterion. Explosive leg strength was assessed from the height of the squat jump (SJ), countermovement jump performed with both legs (CMJ), as well as CMJ performed with each leg separately (CMJR and CMJL, respectively)4. All vertical jumps were performed on a force plate. Leg stiffness was assessed from maximal hopping in place test, as previously suggested2. Each subject performed ten maximal hops in place on a force plate. Mean jumping height (HOP) and leg stiffness (K ; half-period method4) were calculated. Stepwise regression analysis (backward model ; SRA) was used to calculate the relationship between jumping variables and R100. Results Performance in SJ, CMJ, and HOP correlated significantly to R100 (r = -0.76 to -0.83 ; p<0.02). No significant relationship between K and R100 was found (r = 0.14 ; p = 0.72). SRA revealed a simple solution with only CMJ as a significant predictor variable, which explained 69% of R100. For comparison, full regression model (i.e. all five jumping variables included) explained only 5% more variance in R100. Discussion and conclusions Although jump heights in both concentric and stretch-shortening cycle (SSC) movements were significantly related to R100, the best predictor of R100 in trained sprinters is CMJ. These data suggest that CMJ explains both concentric and SSC muscle function relevant to sprint performance. In contrast to previous data1, we found no relation between K and R100. Future studies should examine specific influence of jumping performance on each particular sprint phase. We conclude that CMJ represents the best jumping indicator of R100 I trained sprinters.
Explosive leg strength ; leg stiffness ; sprint performance
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Podaci o prilogu
519-520.
2006.
objavljeno
Podaci o matičnoj publikaciji
Book of Abstracts of the 11th annual congress of the European College of Sport Science 2006 .
Hoppeler, Hans ; Reilly, Tom ; Tsolakidis, Elias ; Gfeller, Liliane ; Klossner, Stephan (ur.).
Lausanne: Cologne : Sportverlag Strauss ,
Podaci o skupu
The 11th annual congress of the European College of Sport Science
poster
05.07.2006-08.07.2006
Lausanne, Švicarska