Graduate Thesis Or Dissertation
 

The effects of whole body vibration on the neuromuscular system

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6d56zz60f

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  • Recently, changes in human performance following whole-body vibration (WBV) training have been attributed to enhanced neuromuscular function. However, the exact neural and muscular mechanisms responsible for these changes remain less understood. The purpose of this study was to evaluate the acute and chronic effects of whole body vibration on the neural control of movement and muscle performance. Twenty male and female subjects with no history of leg injury were randomly assigned to either an experimental or control group. To assess the acute effects of WBV, data was collected from subjects immediately before and following an exposure to WBV (3 bouts of 2 minute with one minute rest between bouts). During the vibration exposure, subjects stood quietly on the platform with a slight amount of knee flexion. Subjects in the control group performed trials of quiet standing on the laboratory floor. Trial length, rest periods and body positions were identical for both groups. The variables used to evaluate the acute effects were electromechanical delay and rate of force development. To assess the chronic effects, the experimental group received WBV training in the laboratory over the course of 4 weeks. The training consisted of 3 sessions per week. During each session, the subjects performed 3 standing trials (2 minutes with one minute rest between bouts). The control group also reported to the laboratory for training consisting of trials of quiet standing. EMD and RFD were also used to assess chronic changes as well as two other measures on neural control, specifically presynaptic inhibition. The two measures of presynaptic inhibition were extrinsic presynaptic inhibition (EPI) and intrinsic presynaptic inhibition measured by paired reflex depression (PRD). The analysis for an acute effect consisted of a 2×2 (Group × Test) ANOVA for the dependent measures EMD and RFD. The experimental (WBV) group demonstrated a significant group × test interaction for the electromechanical delay (p=0.02) and rate of force development (p=0.03). The experimental group decreased EMD by 16% (from 23.42 ms to 19.3 ms) and increased RFD by 15.6% (from 274N/sec to 323 N/sec). The analysis for the chronic effect consisted of 2×3×2 (Group × Test × Time) repeated measure ANOVAs for the dependent measures (EMD, RFD, EPI, and PRD). After a 4 week of WBV training, the experimental (WBV) group demonstrated a significant decrease in electromechanical delay (EMD). The results also showed a significant group × test interaction for the rate of force development (RFD), and paired reflex depression (PRD) over the course of the study. There were no changes in extrinsic presynaptic inhibition noted in any of the comparisons. Through the use of these techniques and procedures, it is concluded that acute WBV has an effect on the EMD and RFD of the soleus muscle in young healthy subjects. Regarding chronic effects of WBV, our findings suggest that 4 weeks of WBV affects intrinsic presynaptic inhibition as measured by paired reflex depression as well as well as EMD and RFD.
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file details Final_Copy_of_Dissertation.pdf 2017-08-02 Público Descargar