Artículos de revistas
Manipulation of Rest Period Length Induces Different Causes of Fatigue in Vertical Jumping
Fecha
2009-05-01Registro en:
International Journal of Sports Medicine. Stuttgart: Georg Thieme Verlag Kg, v. 30, n. 5, p. 325-330, 2009.
0172-4622
10.1055/s-0029-1202260
WOS:000266211900004
3650843918755682
0000-0002-9404-3444
Autor
Universidade Estadual Paulista (Unesp)
Manchester Metropolitan Univ
Universidade de São Paulo (USP)
Universidade Federal do Paraná (UFPR)
Institución
Resumen
The aim of this study was to directly compare the causes of fatigue after a short- and a long-rest interval between consecutive stretch-shortening cycle exercises. Eleven healthy males jumped with different resting period lengths (short = 6.1 +/- 1 s, long = 8.6 +/- 0.9 s), performing countermovement jumps at 95% of their maximal jump height until they were unable to sustain the target height. After short- and long-rest, the maximal voluntary isometric contraction knee extension torque decreased (-7%; p = 0.04), comparing to values obtained before exercise protocols. No change was seen from pre- to post-exercise, for either short- or long-rest, in biceps femoris coactivation (-1%; p = 0.95), peak-to-peak amplitude (1%; p = 0.95) and duration (-8%; p = 0.92) of the compound muscle action potential of the vastus lateralis. Evoked peak twitch torque reduced after both exercise protocols (short = -26%, long = -32%; p = 0.003) indicating peripheral fatigue. However, central fatigue occurred only after short-rest evidenced by a reduction in voluntary activation of the quadriceps muscle (-14%; p = 0.013) measured using the interpolated twitch technique. In conclusion, after Stretch-shortening cycle exercise using short rest period length, the cause of fatigue was central and peripheral, while after using long rest period length, the cause of fatigue was peripheral.