Effects of combined and classic training on different isometric rate of force development parameters of leg extensors in female volleyball players: Discriminative analysis approach
Abstract
Background: The aim of this study is to verify the effects of the combined and classic training of different isometric rates of force
development (RFD) parameters of legs. Materials and Methods: Three groups of female athletes was tested: Experimental group (N =
12), classically trained group (N = 11), and control group (N = 20) of athletes. The isometric “standing leg extension†and “Rise on Toesâ€
tests were conducted to evaluate the maximal force, time necessary time to reach it and the RFD analyzed at 100 ms, 180 ms, 250 ms
from the onset, and 50-100% of its maximal result. Results: The maximal RFD of legs and calves are dominant explosive parameters.
Special training enhanced the RFD of calves of GROUPSPEC at 100 ms (P = 0.05), at 180 ms (P = 0.039), at 250 ms (P = 0.039), at 50%
of the Fmax (P = 0.031) and the Fmax (P = 0.05). Domination of GROUPSPEC toward GROUPCLASS and GROUPCONTROL is in case of legs at
100 ms (P = 0.04); at 180 ms (P = 0.04); at 250 ms (P = 0.00); at 50% of the Fmax (P = 0.01) and at the Fmax (P = 0.00); in case of calves at
100 ms (P = 0.07); 180 ms (P = 0.001); at 250 ms (P = 0.00); at 50% of the Fmax (P = 0.00) and at Fmax (P = 0.000). Conclusion: Dominant
explosive factors are maximal RFD of leg extensors and calves, and legs at 250ms. Specific training enhanced explosiveness of calves of
GROUPSPEC general and partial domination of GROUPSPEC by 87% over GROUPCLASS, and 35% over GROUPCONTROL.
Key words: Calf muscles, isometric rate of force development, leg extensors, plyometric training, volleyball
development (RFD) parameters of legs. Materials and Methods: Three groups of female athletes was tested: Experimental group (N =
12), classically trained group (N = 11), and control group (N = 20) of athletes. The isometric “standing leg extension†and “Rise on Toesâ€
tests were conducted to evaluate the maximal force, time necessary time to reach it and the RFD analyzed at 100 ms, 180 ms, 250 ms
from the onset, and 50-100% of its maximal result. Results: The maximal RFD of legs and calves are dominant explosive parameters.
Special training enhanced the RFD of calves of GROUPSPEC at 100 ms (P = 0.05), at 180 ms (P = 0.039), at 250 ms (P = 0.039), at 50%
of the Fmax (P = 0.031) and the Fmax (P = 0.05). Domination of GROUPSPEC toward GROUPCLASS and GROUPCONTROL is in case of legs at
100 ms (P = 0.04); at 180 ms (P = 0.04); at 250 ms (P = 0.00); at 50% of the Fmax (P = 0.01) and at the Fmax (P = 0.00); in case of calves at
100 ms (P = 0.07); 180 ms (P = 0.001); at 250 ms (P = 0.00); at 50% of the Fmax (P = 0.00) and at Fmax (P = 0.000). Conclusion: Dominant
explosive factors are maximal RFD of leg extensors and calves, and legs at 250ms. Specific training enhanced explosiveness of calves of
GROUPSPEC general and partial domination of GROUPSPEC by 87% over GROUPCLASS, and 35% over GROUPCONTROL.
Key words: Calf muscles, isometric rate of force development, leg extensors, plyometric training, volleyball