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Relationship between isokinetic concentric and eccentric contraction modes in the knee flexor and extensor muscle
Y Wu1, R C Li, N Maffulli
1Haushan Hospital, Shanghai Medical University, People's Republic of China.
The Journal of Orthopaedic and Sports Physical Therapy
|September 1, 1997
Summary
Isokinetic concentric and eccentric strength measures are highly correlated in healthy adults, aiding rehabilitation and injury prevention strategies. Both contraction modes should be assessed for comprehensive muscle evaluation.
Area of Science:
- Biomechanics
- Sports Medicine
- Rehabilitation Science
Background:
- Understanding the relationship between concentric and eccentric muscle strength is crucial for effective rehabilitation and injury prevention.
- Isokinetic testing provides a standardized method for assessing muscle strength variables.
Purpose of the Study:
- To investigate the correlation between isokinetic concentric and eccentric strength variables for knee extension and flexion.
- To inform rehabilitation and injury prevention strategies by clarifying the relationship between different contraction modes.
Main Methods:
- 42 young Chinese adults (22 males, 20 females) participated in the study.
- Isokinetic concentric and eccentric peak torque, total work, and average power of knee extensors and flexors were measured at 60°/sec and 120°/sec using a Cybex 6000 isokinetic dynamometer.
- Repeated analysis of covariance was employed to compare means, adjusting for limb dominance, testing speed, and muscle groups.
Main Results:
- A highly significant correlation (r = 0.67–0.93) was observed between all concentric and eccentric strength variables.
- Eccentric variables were significantly greater than concentric variables for most measures.
- Hamstring to Quadriceps (H:Q) ratios showed poor correlation between concentric and eccentric modes (r = 0.359–0.645).
Conclusions:
- Despite strong correlations between concentric and eccentric strength, differences exist, with eccentric strength generally being greater.
- Both concentric and eccentric strength assessments are recommended for comprehensive planning of rehabilitation programs and muscle group evaluation.