| dc.description.abstract | The literature presents contradictory statements concerning
the effectiveness of free weights, isokinetic devices and
plyometric exercises on the development of lower extremity power,
and lean body mass {Coyle, Feiring, Rotkis, Cote, Roby, Lee, &
Wilmore, 1981; Gettman, Cutler & Strathman, 1980; Pipes &
Wilmore, 1975; Promoli & Holt, 1979; Verhoshanski & Tatyan,
1983; and Scoles, 1978) . There is limited evidence in the
literature measuring the effectiveness of combining plyometrics
and various alternative resistance training devices.
The training effects of four experimental groups were
investigated; free weights (FW), Hydra-Fitness (HF), Hydra-
Fitness plus plyometrics (HFP), and free weights plus
plyometrics (FWP). Pre-training and post-training tests for the
lower extremity measured lean body mass, muscular peak power at
slow and fast speeds (60, and 180 degrees/second), powerendurance
and vertical jump power. Forty Physical Education
students were randomly assigned into four groups; free weights,
Hydra-Fitness, Hydra-Fitness plus plyometrics, and free weights
plus plyometrics. The intensity of each group was equated.
Subjects were trained three times per week for seven weeks. A 4
(groups) by 2 (tests) ANOVA with repeated measures on the last
factor (p<.05) was employed on pre and post training raw data.
Post-hoc technique (Scheffe' method) was employed when
significant interactions were found. All groups improved the lean
body mass, vertical jump, and power-endurance after training. There were no significant differences found between the four
training groups. Plyometrics in combination with free weights or
Hydra-Fitness appear to have a positive training effect on power. | |
