Korean J Sports Med.  2012 Jun;30(1):47-54. 10.5763/kjsm.2012.30.1.47.

Effects of Plyometric Training on Ankle Joint Motion and Jump Performance

• Kim HY

• KMID: 2288648
• DOI: http://doi.org/10.5763/kjsm.2012.30.1.47

Abstract

The purpose of this study was to quantify the effect of plyometric training (PT) in changes of jump abilities and ankle joint motions on repeated-rebound-jumps exercise without buffer function of lower limb joints. Seven female collegiate runners executed 10-repeated rebound jumps training (10 RJ) on a switch mat with maximum effort. Each subject executed the training program twice a week for 5 consecutive weeks. Parameters of repeated-rebound jumps training involved jump height (m), the contact time (s), flight time (s), and rebound jumps index (=RJ-index). Three-dimensional ankle joint kinematics of each subject were captured using ten motion capture systems (250 Hz). As a result, RJ-index, jump height, and flight time were increased significantly between pre-and post-test (p<0.001). But, the contact time decreased significantly. The relationships between rebound jumps index and jump height and between rebound jumps index and the durations of contact phase were highly correlated (r=0.858, r=-0.739; p<0.001). In addition, the time (%) between start and finish phase in the dorsiflexion angle of ankle joint was reduced significantly between pre-and post-test (p<0.001). The repeated-rebound-jumps exercise was shown to have an effect on improvement in stretch-shortening cycle (SSC) performance of lower limb joints in distance runners. The RJ-index and the time between start and finish phase in the dorsiflexion angle of ankle joint was shown to be a valid evaluation index of SSC performance. Therefore, repeated-rebound-jumps exercise is a significant training protocol where ankle behavior improves and where the performance of stretch-shortening cycle is enhanced.

Keyword

Plyometric training; Ankle joint motion; Jump performance; RJ-index

MeSH Terms

Animals
Ankle
Ankle Joint
Biomechanics
Female
Humans
Joints
Lower Extremity
Plyometric Exercise

Figure

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  Fig. 1 Experimental setup of rebound jump test.

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  Fig. 2 Comparisons of pre and post-test in each parameter: (A) Rebound jumps index, (B) contact time, (C) flight time and, (D) jump height. p<0.001***.

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  Fig. 3 Relationship between rebound jumps index (RJ-index) and jump height (A), RJ-index and contact-time (B) and, RJ-index and flight-time (C).

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  Fig. 4 Changes in mean ankle joint angle (A) and angular velocity (B) during 10-repeated rebound jump between pre and post-test. The start of the movement was taken from the instant of minimum force and terminated at the instant of take-off. Flight phase occurred between the instant of take-off and the instant of contact with the forceplate (landing). Contact phase in each subject is normalized as 100%. MDA: maximum dorsiflexion angle, TDSF: time period of dorsiflexion between start and finish phase.

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  Fig. 5 Comparisons of pre and post-test in maximum dorsiflexion angle (MDA) and time period of dorsiflexion between start and finish phase (TDSF): (A) MDA and, TDSF (B). **p<0.01, ***p<0.001.

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  Fig. 6 Relationship between time period of dorsiflexion between start and finish phase (TDSF) and rebound jumps index (A) and, TDSF and maximum dorsiflexion angle (B).

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