Immediate effect on vertical jumping ability after the completion of trampoline jumping
The purpose of this study was to value the immediate effect on the capacity of vertical jump, caused by the execution of continuous jumps in a trampoline. Nine subjects (23,4 ± 2.83 years), males and sportsmen with prior experience in the execution of countermovement jump (CMJ), they carried out a series of continuous vertical jumps on a trampoline during 60 seconds, being valued the capacity of jump in platform of contacts before and after this activity. The electromyographic (EMG) activity was registered of five muscles of the right leg (gluteus, biceps femoris, vastus lateralis, gastrocnemius medialis and soleus) in all the CMJ. The height of jump diminished significantly (p <0.01) after the execution of the jumps in the trampoline, being recovered in a brief period of time. Themselves differences were not observed in the EMG for the root mean squared (RMS) or in the amplitude in none of the muscles, neither in the phase of impulse, neither in the 50 ms previous to start of the jump. In the neuromuscular pattern, in spite of the great variability existing inter and intraindividual, a significant delay was identified (p<0.05) in the activation of the biceps femoris immediately after the trampoline. Keeping in mind these results, seems probably that the smaller height of the vertical jump reached after the trampoline be more attributable to a modification in the temporary characteristics and sequence of activation of the muscles that to a decrease in the activation of the same.
KEY WORDS: Vertical Jump, Neuromuscular pattern, Sprung surface, Electromyography.