Sled-Push Load-Velocity Profiling and Implications for Sprint Training Prescription in Young Athletes

Micheal J. Cahill; Jon L. Oliver; John B. Cronin; Kenneth P. Clark; Matt R. Cross; Rhodri S. Lloyd

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Sled-Push Load-Velocity Profiling and Implications for Sprint Training Prescription in Young Athletes

Micheal J. Cahill ^[1] ; Jon L. Oliver ; John B. Cronin ; Kenneth P. Clark ; Matt R. Cross ; Rhodri S. Lloyd
1. [1] Auckland University of Technology
  
  Auckland University of Technology
  
  Nueva Zelanda
Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 35, Nº. 11, 2021, págs. 3084-3089
Idioma: inglés
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Resumen
- Resisted sled pushing is a popular method of sprint-specific training; however, little evidence exists to support the prescription of resistive loads in young athletes. The purpose of this study was to determine the reliability and linearity of the force-velocity relationship during sled pushing, as well as the amount of between-athlete variation in the load required to cause a decrement in maximal velocity (Vdec) of 25, 50, and 75%. Ninety (n = 90) high school, male athletes (age 16.9 +/- 0.9 years) were recruited for the study. All subjects performed 1 unresisted and 3 sled-push sprints with increasing resistance. Maximal velocity was measured with a radar gun during each sprint and the load-velocity (LV) relationship established for each subject. A subset of 16 subjects examined the reliability of sled pushing on 3 separate occasions. For all individual subjects, the LV relationship was highly linear (r > 0.96). The slope of the LV relationship was found to be reliable (coefficient of variation [CV] = 3.1%), with the loads that cause a decrement in velocity of 25, 50, and 75% also found to be reliable (CVs = <5%). However, there was large between-subject variation (95% confidence interval) in the load that caused a given Vdec, with loads of 23-42% body mass (%BM) causing a Vdec of 25%, 45-85 %BM causing a Vdec of 50%, and 69-131 %BM causing a Vdec of 75%. The Vdec method can be reliably used to prescribe sled-push loads in young athletes, but practitioners should be aware that the load required to cause a given Vdec is highly individualized.