Affiliations: [a] Musculoskeletal Dynamics Laboratory, Human Performance
Laboratories, The University of Memphis, Memphis, TN, USA
Note: [] Corresponding author: Lawrence W. Weiss, Human Performance
Laboratories, Field House 220, The University of Memphis, Memphis, TN
38152-6223 USA. Tel.: +1 901 678-4648; Fax: +1 901 678-3464; E-mail:
weiss.larry@coe.memphis.edu
Abstract: If independent variables collectively account for each person's
ability to vertically jump, then appropriate manipulations of any or all of
these factors would be expected to improve jumping performance.Furthermore, if
training may elicit the desired manipulations, then the identification of
specific weaknesses would enable clinicians and scientists to individualize
interventions so as to maximize the effects. In the present exploratory
investigation, equations were developed predicting depth vertical jumping (DVJ)
distance, a technique roughly simulating the myriad of scenarios in which a
rapidly decelerated linear movement precedes vertical jumping.To accomplish
this, body composition and 32 variables generated during the performance of
concentric-only velocity-spectrum squats were obtained using 52 men and 50
women. At each of four different squatting velocities four force and four power
variables met conservative reliability standards for selection as potential
predictors of jumping performance. Two explanatory regression equations
generated via a forward stepwise approach yielded R-values of 0.89 and 0.90 and
SEE ranging from 0.059 to 0.060 meters (2.32 to 2.36 inches). Relative peak
power (peak-power-to-body-weight ratio) during squatting exercises performed at
1.43 meters.sec-1 as well as at each individual's optimal velocity for power
production were significant predictors of DVJ distance.The predicted distance
was also significantly attenuated if subjects were female. Based upon the
variables assessed in this investigation, it appears that for young adults, the
higher the relative peak squatting power at moderately fast velocities the
greater the DVJ performance, and being female negatively impacts this type of
jumping.
