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Related Experiment Videos

Concentric and eccentric quadriceps torque in pre-adolescent males.

N G Mohtadi1, G N Kiefer, K Tedford

  • 1Alberta Children's Hospital Child Health Centre, Calgary.

Canadian Journal of Sport Sciences = Journal Canadien Des Sciences Du Sport
|December 1, 1990
PubMed
Summary

This study demonstrates that isokinetic testing using the Kin Com machine reliably measures quadriceps torque in children aged 10-12. Eccentric contractions yielded higher peak torque than concentric contractions, indicating a practical method for assessing pediatric muscle strength.

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Area of Science:

  • Pediatric Exercise Science
  • Biomechanics
  • Musculoskeletal Research

Background:

  • Assessing muscle strength in children is crucial for understanding growth and development.
  • Quantitative muscle strength assessment in pediatric populations presents unique methodological challenges.
  • Isokinetic dynamometry offers a standardized approach to measuring muscle function.

Purpose of the Study:

  • To evaluate the Kin Com isokinetic machine's applicability for measuring quadriceps torque in healthy male children aged 10-12 years.
  • To assess the reliability of concentric and eccentric quadriceps torque measurements in this pediatric cohort.
  • To establish a reproducible method for quantitative muscle strength assessment in children.

Main Methods:

  • Twelve healthy male volunteers (10-12 years) participated.

Related Experiment Videos

  • Quadriceps concentric and eccentric torque were measured using the Kin Com isokinetic machine at 60°/second.
  • Measurements were repeated after two weeks on a subgroup to assess reliability using method error and paired t-tests.

    • Main Results:

    • No statistically significant differences were found between initial and retest measurements, indicating high reliability.
    • Eccentric peak torque was significantly greater than concentric peak torque for both dominant (p=0.002) and non-dominant (p=0.01) quadriceps.
    • No significant differences in torque were observed between the dominant and non-dominant lower extremities.

    Conclusions:

    • Isokinetic dynamometry provides a reliable and reproducible method for quantifying quadriceps muscle strength in children.
    • This study successfully quantitated eccentric muscle testing in children for the first time.
    • The findings support the use of the Kin Com machine for pediatric muscle strength assessment.