The Effects Of Lower Body Fatigue On Vertical Jump Ground Reaction Forces

Event Center BC

Purpose: Ground reaction forces and a decrease in muscular force- generating capacity can both be used to measure fatigue. Therefore, the purpose of this study is to determine the effects of lower body fatigue on ground reaction force measures. Methods: Nineteen recreationally trained males and females participated in a combined familiarization and testing session. Participants were familiarized with two types of vertical jumps and fatiguing protocol. Three trials for both the static jump (SJ) and countermovement vertical jump (CMVJ) were performed on a force plate, pre and post Bosco Protocol. The dependent variables calculated from the force plate were rate of velocity development (RVD), peak force (PF), impact force (IF), peak velocity (PV), and peak power (PP). Paired-sampled t-tests were used to analyze pre/post differences for each dependent variable. Results: There was a significant difference between pre and post PF (p=0.003; pre=1,523.68 ± 360.65N; post= 1,464.03 ± 342.24N), IF (p=0.001; pre= 1,175.02 ± 1142.37N; post= 1355.05 ± 987.34N), PV (p=0.002; 2.63 ± .36; post= 2.38 ± .51m/s), and PP (p=0.001; pre= 3373.09 ± 1088.92m/s; post= 2922.89 ± 1100.00m/s) measures for CMVJ. There was a significant difference pre and post measures for SJ peak force (p=0.001; pre= 1298.95 ± 261.97N; post= 1230.60 ± 261.97N). Conclusion: Bosco protocol showed a significant decreased in PF, IF, PV, and PP for CMVJ and a significant decrease in PF for SJ. Results showed that performing a high-intensity multi joint activity, Bosco protocol, can lead to muscle fatigue and significantly alter force production recreationally trained populations.