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Asian J Kinesiol > Volume 18(3); 2016 > Article
The Official Journal of the Korean Academy of Kinesiology 2016;18(3):1-11.
DOI: https://doi.org/10.15758/jkak.2016.18.3.1    Published online August 30, 2016.
Effects of Vertical Jump Performance and Ground Reaction Force Variables according to the Fatigue by Submaximal Treadmill Exercise
Che-Cheong Ryew, Seung-Hyun Hyun, Young-Pyo Kim
Jeju National University
Correspondence:  Young-Pyo Kim,
Email: kimyp@jejunu.ac.kr
Received: 19 April 2016   • Accepted: 20 August 2016
Abstract
PURPOSE
The purpose of this study was to investigate the effects. of the vertical jump and ground reaction force variables according to fatigue by submaximal treadmill exercise.
METHODS
We selected n=9 young and healthy men(mean age: 25.33±3.80 yrs, mean heights: 1.73±0.02 m, mean body weights: 69.65±6.79 kg). Fatigue was induced by a short period of strenuous exercise performed on a treadmill with using the Bruce protocol. The variables analyzed were the vertical jump height, ground reaction force(medial lateral[ML] GRF, anterior posterior[AP] GRF), peak vertical force[PVF], and dynamic postural stability index([MLSI, APSI, VSI, DPSI]) according to induced fatigue.
RESULTS
1. Vertical jump heights was significantly lower posttest(p<.01). 2. AP GRF, PVF, and loading rate were significantly loewr posttest(p<.05). 3. Dynamic postural stability index(MLSI[left], VSI, DPSI) was significantly higher posttest(p<.05). 4. GRF variables showed similar correlation(PVF with loading rate r=.596[R 2 =35%], MLSI with APSI r=.816[R2=66%], VSI with DPSI r=.970[R 2 =94%]) according to induced fatigue(p<.05).
CONCLUSIONS
In conclusion, fatigue alters vertical jump performance and landing performance including changes in dynamic stability; and GRF magnitudes. Also future research should continue to investigate the different GRF responses that occur during landing after fatigue.
Keywords: fatigue, vertical jump, drop landing, ground reaction force, dynamic postural stability index
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