Relationships between rapid isometric torque characteristics and vertical jump performance in division i collegiate American football players: Influence of body mass normalization

Brennan J. Thompson, Eric D. Ryan, Eric J. Sobolewski, Doug B. Smith, Kazuma Akehi, Eric C. Conchola, Tyler Buckminster

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

The purpose of the present study was to examine the relationships between absolute and body mass-normalized rapid isometric torque variables and vertical jump (VJ) performance of the leg extensors and flexors in elite National Collegiate Athletic Association Division I Football Bowl Subdivision collegiate American football players. Thirty-one players performed isometric maximal voluntary contractions of the leg extensor and flexor muscle groups and a countermovement VJ. Rate of torque development (RTD) and the contractile impulse (IMPULSE) were determined from 0 to 30, 0 to 50, 0 to 100, and 0 to 200 milliseconds from the onset of muscular contraction. The relationships between absolute and normalized rapid torque variables and VJ performance were assessed using correlation coefficients (r). There were no significant correlations (p . 0.05) observed between the absolute rapid torque variables and VJ performance, except for leg flexion RTD at 0-200 milliseconds (p = 0.024). All normalized rapid torque variables of the leg extensors and flexors were significantly correlated to VJ performance (p # 0.001-0.026). These findings indicated that normalizing rapid torque variables to body mass improves the relationships between isometric rapid torque variables and VJ performance and normalized leg extension and flexion are both similarly related to VJ performance. Strength and conditioning professionals may use these findings in an attempt to identify and monitor dynamic sport performance. Furthermore, future studies examining the relationship between dynamic on the field performances and laboratory-based isometric strength testing may consider including normalized rapid torque variables.

Original languageEnglish (US)
Pages (from-to)2737-2742
Number of pages6
JournalJournal of strength and conditioning research
Volume27
Issue number10
DOIs
StatePublished - 2013

Keywords

  • Explosive strength
  • Hamstrings
  • Impulse
  • Normalization
  • Quadriceps
  • Rate of force development

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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