The Acute Effects Of Different Loading Patterns With Vibration Exercise On Jumping Performance

ObjectiveThe purpose of this research is to investigate the acute effects of jumpingperformence （loaded with no WBV and loaded with WBV） and the sEMGcharacteristics of the leg during the exercise in the ways of static squats and dynamicsquats. The aim is to provide a experimental basis for the choise of the loadingpatterns’ and the applications of whole-body vibration as a warm-up procedure.Methods14male healthy subjects were recruited and performed a series of static squatsand dynamic squat（sloaded with no WBV and loaded with WBV）randomly. The loadwas set to30%of their body mass(BW) and WBV vibration protocol at frequency25Hz and amplitude of2mm. Each bout of training included3sets of exercises, eachset lasted1minute,1-2min interval between exercises. The EMG of tibialis anterior,medial gastrocnemius, lateral gastrocnemius, vastus medialis, rectus femoris, vastuslateralis, biceps femoris was recorded during the exercises. The squat jump(SJ) andcountermovement jump (CMJ) performance was tested before and immediately aftertraining.Results1) The method of paired T-test was used to analyze the EMGrms（%MVC） oftibialis anterior, medial gastrocnemius, lateral gastrocnemius, vastus medialis, rectusfemoris, vastus lateralis, biceps femoris during the exercise with and without vibration.The results show the EMGrms（%MVC）of tibialis anterior, gastrocnemius, vastusmedialis, rectus femoris, vastus lateralis muscle were significantly increased. TheEMGrms（%MVC）of biceps femoris were statistically significant (p <0.01) in themanner of dynamic squats and no difference of static squats (p=0.085).2) Statistical analysis was performed with an analysis of repeated measuresvariance(2condition×3type of exercises). The results show that the vibration or loading patterns and the interaction were no significant influence on the CMJ and SJjump height (p<0.05).3) The results show that the vibration or loading patterns have a significantinfluence on the Peak power of CMJ (p <0.01), but their interaction were nosignificant influence (p=0.95). After an overall F value was found to be significant,preplanned contrast analyses were performed to evaluate significant vibration effectsin each exercise and significant differences in vibration effect among different loadingpatterns exercises. The results show that Peak power of CMJ after the exercise withand without vibration were statistically significant (p <0.01). The peak power of CMJof were statistically significant between the manners of dynamic squats and staticsquats (p <0.01) and no statistically significant between the manners of dynamicsquats (p=0.011).4) The results show that the vibration or loading patterns have a significantinfluence on the peak power of SJ (p <0.01), but their interaction were no significantinfluence (p=0.552). The peak power of SJ after the exercise with and withoutvibration were statistically significant(p <0.01). The Peak power of SJ of werestatistically significant between the manners of dynamic squats and static squats(p=0.005、0.001) and no statistically significant between the manners of dynamicsquats（p=0.104）.Conclusion1) The strength exercises with WBV can improve the muscles activity of tibialisanterior, gastrocnemius, quadriceps activity. Dynamic squats exercise can alsoimprove the muscles activity of biceps femoris.2) The jump height cann’t be improved after the exercises which included3sets,each set lasted1minute, and loaded30%BW and vibration protocol at frequency of25Hz and amplitude of2mm.3) The strength exercises with WBV can improve the peak power of jump. Dynamicsquats exercise can be more effective.