Analysis of isokinetic knee extension/flexion in male elite adolescent wrestlers


JOURNAL OF SPORTS SCIENCE AND MEDICINE, vol.4, no.4, pp.489-498, 2005 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 4 Issue: 4
  • Publication Date: 2005
  • Page Numbers: pp.489-498
  • Keywords: wrestling, adolescent, isokinetic dynamometer, muscle, load range, FIBER COMPOSITION, MUSCLE STRENGTH, FORCE-VELOCITY, PEAK TORQUE, BODY-SIZE, MEN, POWER, YOUNG, AGE, EXERCISE


Wrestling requires strength of the upper and lower body musculature which is critical for the athletic performance. Evaluation of the adolescent's skeletal muscle is important to understand body movement, especially including those involved in sports. Strength, power and endurance capacity are defined as parameters of skeletal muscle biomechanical properties. The isokinetic dynamometer is an important toll for making this type of evaluation. However, load range phase of range of motion has to be considered to interpret the data correctly. With this in mind we aimed to investigate the lover body musculature contractile characteristics of adolescent wrestlers together with detailed analyses of load range phase of motion. Thirteen boys aged 12 - 14 years participated to this study. Concentric load range torque, work and power of knee extension and flexion were measured by a Cybex Norm dynamometer at angular velocities from 450 degrees/ sec to 30 degrees/ sec with 30 degrees/ sec decrements for each set. None of the wrestlers were able to attain load range for angular velocities above 390 degrees/ sec and 420 degrees/ sec for extension and flexion respectively. Detailed analyses of the load range resulted in statistically significant differences in the normalized load range peak torque for extension at 270 degrees/ sec ( 1.44 +/- 0.28 Nm center dot kg(-1) and 1.14 +/- 0.28 Nm center dot kg(-1) for total and load range peak torque respectively, p < 0.05), and for flexion at 300 degrees/ sec (1.26 +/- 0.28 Nm center dot kg(-1) and 1.03 +/- 0.23 Nm center dot kg(-1) for total and load range peak torque respectively, p < 0.05), compared to total peak torque data. Similarly, the significant difference was found for the work values at 90 degrees/ sec (1.91 +/- 0.23 Nm center dot kg(-1) and 1.59 +/- 0.24 Nm center dot kg(-1) for total and load range work respectively for extension and 1.73 +/- 0.21 Nm center dot kg(-1) and 1.49 +/- 0.19 Nm center dot kg(-1) for total and load range work respectively for flexion, p < 0.05), and was evident at higher angular velocities ( p < 0.001) for both extension and flexion. At extension, load range power values were significantly smaller than total power for all angular velocities except 150 degrees / sec ( p < 0.05 for 120 and 180 degrees / sec, p < 0.001 for others). Finally, load range flexion power was found to be higher than total power with statistically significance ( p < 0.05 for 60, 120, 150, 180, 210, 270 and 300 degrees/ sec, p < 0.001 for 240 degrees/ sec). Extra caution is required for correct interpretation of load range data in terms of considering the load range during limb movement. Evaluation of muscle performance of these adolescent wrestlers at regular intervals may give us an opportunity to obtain a healthy maturation profile of these adolescent wrestlers.