A Multivariate Approach to Predicting Knee Extensor Performance

John F. Caruso, Daniel A. Hernandez, Torrey Schweickert, Kyoko Saito, John L. Hamill, Nicole DeGarmo
2003 Journal of Strength and Conditioning Research  
The impact of two predictor variables (estimated knee extensor fast-twitch fiber percentage, body mass) on performance measures (vertical jump power output, leg press peak angular velocity) were examined. Subjects (25 men, 27 women) performed 5 workouts involving 2 vertical jump, leg press, and 50-repetition isokinetic tests (to estimate knee extensor fast-twitch fiber percentage). Multivariate regression determined the following significant (p Ͻ 0.05) vertical jump equations: predicted male
more » ... : predicted male power output ϭ Ϫ59.3464 ϩ 1.566 (estimated knee extensor fast-twitch muscle fiber percent) ϩ 15.7884 (body mass), predicted female power output ϭ 36.1574 ϩ 3.4248 (estimated knee extensor fast-twitch muscle fiber percent) ϩ 9.8633 (body mass). Leg press peak angular velocity equations were insignificant by gender; thus, pooled data yielded the following: predicted leg press peak angular velocity ϭ 18.6187 ϩ 0.235 (estimated knee extensor fasttwitch muscle fiber percent) ϩ 0.3801 (body mass). Body mass explained more variance for each performance measure.
doi:10.1519/1533-4287(2003)017<0608:amatpk>2.0.co;2 pmid:12930194 fatcat:wihvtmvj7vgszk37yrrsnb6w24