title: A multivariate approach to predicting knee extensor performance.
abstract: 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 < 0.05) vertical jump equations: predicted male power output = -59.3464 + 1.566 (estimated knee extensor fast-twitch muscle fiber percent) + 15.7884 (body mass), predicted female power output = 36.1574 + 3.4248 (estimated knee extensor fast-twitch muscle fiber percent) + 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 = 18.6187 + 0.235 (estimated knee extensor fast-twitch muscle fiber percent) + 0.3801 (body mass). Body mass explained more variance for each performance measure.
authors.affiliation: Exercise Physiology Laboratory, University of Nevada, Reno, NV 89557, USA. drjcaruso@aol.com
authors.forename: John F
authors.initials: JF
authors.lastname: Caruso
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Hernandez
authors.forename: Torrey
authors.initials: T
authors.lastname: Schweickert
authors.forename: Kyoko
authors.initials: K
authors.lastname: Saito
authors.forename: John L
authors.initials: JL
authors.lastname: Hamill
authors.forename: Nicole
authors.initials: N
authors.lastname: DeGarmo
mesh_terms: D000328:Adult; D015992:Body Mass Index; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D018656:Muscle Fibers, Fast-Twitch / Q000502:physiology; D009132:Muscles / Q000502:physiology*; D011237:Predictive Value of Tests; D012044:Regression Analysis; D019415:Torque