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In vivo human tendinous tissue stretch upon maximum muscle force generation
1Scottish School of Sport Studies, University of Strathclyde, G13 1PP, Glasgow, UK. costis.maganaris@strath.ac.uk
Journal of Biomechanics
|August 15, 2000
Summary
The human tibialis anterior (TA) muscle-tendon unit shows varied stretch along its length during maximum voluntary contraction (MVC). The aponeurosis stretches significantly more than the tendon, especially in its proximal region.
Area of Science:
- Biomechanics
- Human Physiology
- Musculoskeletal Research
Background:
- Understanding muscle-tendon unit mechanics is crucial for biomechanical analysis and injury prevention.
- Previous research often assumed uniform strain distribution within muscle-tendon units.
Purpose of the Study:
- To investigate the hypothesis that tendinous tissue stretch in the human tibialis anterior (TA) muscle-tendon unit varies along its entire length during isometric dorsiflexion maximum voluntary contraction (MVC).
Main Methods:
- Ultrasound measurements of TA tendon origin and proximal aponeurosis excursions from rest to MVC in six men.
- Calculation of aponeurosis, proximal aponeurosis, and distal aponeurosis excursions and strains.
- Comparison of strain values between tendon and different aponeurosis regions.
Main Results:
- Tendon exhibited 3.1% strain, while the aponeurosis showed 6.5% strain.
- The proximal aponeurosis region displayed significantly higher strain (9.2%) compared to the distal region (3.5%).
- Aponeurosis strain was 110-120% greater than tendon strain, and proximal aponeurosis strain was 165-170% greater than distal aponeurosis strain (P<0.05).
Conclusions:
- The stretch is not uniform along the human TA muscle-tendon unit during MVC.
- The aponeurosis, particularly its proximal region, accommodates a larger proportion of the strain.
- Findings support in vitro animal studies and have implications for theoretical models of muscle function.