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Stature Variables as Discriminators of Foot Contact during the Squat Exercise in Untrained Females.

Fry, Andrew C.; Kraemer, William J.; Bibi, Khalid W.; Eyford, Thora
Journal of Strength & Conditioning Research: May 1991
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Previous research indicates that stature variables (height [HT], torso length [TL], femur length [FL] are potent discriminators of complete foot contact with the ground during the parallel squat exercise for males in a beginning weight training program. The purpose of this study was to determine if the same variables are also potent discriminators for untrained females. Females in beginning weight training classes (n = 26, X age = 20.8 +/- 2.9 years) were measured for the three stature variables. After two weeks of introductory instruction and familiarization with the exercise, each subject performed three parallel squats with a 20-kg barbell across the top of the trapezius, and with feet shoulder width apart. Those able to maintain complete foot contact with the ground were classified as successful (n = 19), and all others as unsuccessful (n = 7). A correlation matrix revealed that none of the three stature variables shared more than 53 percent common zero-order variance (r2). A full-model multiple discriminant analysis correctly classified only 77 percent of the subjects (N.S., p > 0.05). The relative contribution of each variable to the explained variance from the discriminant function include FL (49.0 percent), TL (29.8 percent) and HT (0.8 percent). These data indicated that stature variables are equally potent discriminators of proper foot contact during the squat exercise for females as for previously investigated males, but that the most potent discriminator for females (femur length) was different than that previously found for males (height). Furthermore, 20.4 percent of the variance was not explained, indicating that factors other than HT, TL or FL contribute to improper foot contact during the squat exercise with untrained females.

(C) 1991 National Strength and Conditioning Association