Korean J Sports Med.  2016 Jun;34(1):48-56. 10.5763/kjsm.2016.34.1.48.

Norm-Referenced Criteria for Isokinetic Strength of the Lower Limbs for the Korean High School Baseball Players

Affiliations
  • 1Sunsoochon Hospital, Seoul, Korea. trainerksh@hanmail.net
  • 2Department of Kinesiologic Medical Science, Dankook University, Seoul, Korea.

Abstract

This study concerns norm-referenced criteria for isokinetic strength of the lower limbs for the Korean high school baseball players. Two hundred one high school baseball players were participated in this study. They didn't have any medical problem at the lower limbs. Each test was conducted four times in the ankle plantar flexion/dorsiflexion test at 30°/sec speed, knee flexion/ extension test was conducted four times at 60°/sec speed. Humac Norm (CSMI, USA) system was used to obtained the value of peak torque, peak torque % body weight. The results were presented as a norm-referenced criterion value using 5-point scale of cajori, by 5 group (6.06%, 24.17%, 38.30%, 24.17%, and 6.06%) and a few suggestions from this study as follows. The provided criterion of peak torque and peak torque % body weight are very useful information for baseball palyers, baseball coach, athletic trainers and sports injury rehabilitation experts, to utilize as an objective clinical assessment data.

Keyword

Baseball; Isokinetic strength; Peak torque; Lower extremity

MeSH Terms

Ankle
Athletic Injuries
Baseball*
Body Weight
Humans
Knee
Lower Extremity*
Rehabilitation
Sports
Torque

Figure

  • Fig. 1. Knee extension/flexion range of motion & seated position.

  • Fig. 2. Ankle plantar flexion/ dorsiflexion range of motion & prone position.

  • Fig. 3. The comparison of peak torque dorsiflexor and plantar flexor of ankle joint in each sports. (A) The values of peak torque dorsiflexor and plantar flexor of the right side ankle joint. (B) The values of peak torque dorsiflexor and plantar flexor of the left side ankle joint.

  • Fig. 4. The comparison of peak torque % body weight (PT%BW) dorsiflexor and plantar flexor of ankle joint in each sports. (A) The values of PT%BW (%) dorsiflexor and plantar flexor of the right side ankle joint. (B) The values of PT%BW (%) dorsiflexor and plantar flexor of the left side ankle joint.

  • Fig. 5. The comparison of peak torque extensor and flexor of knee joint in each sports. (A) The values of peak torque extensor of the right side knee joint. (B) The values of peak torque extensor of the left side knee joint. (C) The values peak torque flexor of the right side knee joint. (D) The values peak torque flexor of the left side knee joint.

  • Fig. 6. The comparison of peak torque % body weight (PT%BW) extensor and flexor of knee joint in each sports. (A) The values of PT%BW (%) extensor of the right side knee joint. (B) The values of PT%BW (%) extensor of the left side knee joint. (C) The values PT%BW (%) flexor of the right side knee joint. (D) The values peak torque % body weight flexor of the left side knee joint.


Reference

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