Human Achilles tendon plasticity in response to cyclic strain: effect of rate and duration
| Autor: | Sebastian Bohm, Adamantios Arampatzis, Martin Tettke, Falk Mersmann, Marc Kraft |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Cyclic strain
Adult Male medicine.medical_specialty Materials science Physiology Aquatic Science Plasticity Achilles Tendon High strain Elastic Modulus Isometric Contraction medicine Humans Molecular Biology Exercise Ecology Evolution Behavior and Systematics Achilles tendon business.industry Ultrasound Stiffness Strain rate musculoskeletal system Adaptation Physiological Magnetic Resonance Imaging Surgery Tendon Biomechanical Phenomena medicine.anatomical_structure Insect Science Animal Science and Zoology Stress Mechanical medicine.symptom business Biomedical engineering |
| Zdroj: | The Journal of experimental biology. 217(Pt 22) |
| ISSN: | 1477-9145 |
| Popis: | High strain magnitude and low strain frequency are important stimuli for tendon adaptation. Increasing the rate and duration of the applied strain may enhance the adaptive responses. Therefore, our purpose was to investigate the effect of strain rate and duration on Achilles tendon adaptation. The study included two experimental groups (n=14 and n=12) and a control group (n=13). The participants of the experimental groups exercised (14 weeks, 4x/week) according to a reference protocol, featuring a high strain magnitude (~6.5%) and a low strain frequency (0.17 Hz, 3 s loading/3 s relaxation) on one leg and with either a higher strain rate (one-legged jumps) or a longer strain duration (12 s loading) on the other leg. The strain magnitude and loading volume were similar in all protocols. Before and after the interventions the tendon stiffness, Young’s modulus and cross-sectional area were examined using magnetic resonance imaging, ultrasound and dynamometry. The reference and long strain duration protocols induced significantly increased (p0.05). The results provide evidence that a high strain magnitude, an appropriate strain duration and repetitive loading are essential components for an efficient adaptive stimulus for tendons. |
| Databáze: | OpenAIRE |
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