Spatial and temporal heterogeneity of superficial muscle strain during in situ fixed-end contractions
| Autor: | Cwj Cees Oomens, Mkc Matthijs Hesselink, M Mascha Maenhout, Pjb Paul Willems, M Maarten Drost, Fpt Frank Baaijens |
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| Přispěvatelé: | Bewegingswetenschappen, RS: NUTRIM School of Nutrition and Translational Research in Metabolism, Mechanical Engineering, Soft Tissue Biomech. & Tissue Eng. |
| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Male
Sarcomeres Materials science Contraction (grammar) Muscle Fibers Skeletal Biomedical Engineering Biophysics Isometric exercise Sarcomere Motor Endplate Tibialis anterior muscle Isometric Contraction medicine Animals Orthopedics and Sports Medicine Rats Wistar Muscle Skeletal Mechanical load Rehabilitation Skeletal muscle Anatomy Elasticity Electric Stimulation Rats medicine.anatomical_structure Torque Proximal Muscle Stress Mechanical Ankle Joint |
| Zdroj: | Journal of Biomechanics, 36(7), 1055-1063. ELSEVIER SCI LTD Journal of Biomechanics, 36(7), 1055-1063. Elsevier |
| ISSN: | 0021-9290 |
| DOI: | 10.1016/s0021-9290(02)00461-x |
| Popis: | Spatial and temporal heterogeneity of superficial muscle strain during in situ fixed-end contractions.Drost MR, Maenhout M, Willems PJ, Oomens CW, Baaijens FP, Hesselink MK.Department of Movement Sciences, Nutrition and Toxicology Research Institute Maastricht, Maastricht University, P.O. Box 616, 6200, Maastricht, The Netherlands. maarten.drost@bw.unimaas.nlNumerical models of contracting muscle offer a powerful tool to study local mechanical load. For validation of these models, the spatial and temporal distribution of strain was quantified in fixed-end contracting rat tibialis anterior muscle in situ at optimal muscle length (L(o)) and at 120 degrees plantar flexion as well as at 125 and 33Hz stimulation frequency. We studied the hypothesis that after termination of stimulation in situ muscle segments near the motor endplates elongate while segments away from the endplates shorten. We show that both spatial and temporal inhomogeneities in muscle deformation occurred during contraction. Muscle plateau shortening strain equalled 4.1%. Maximal plateau shortening of a muscle segment was much larger (9.6%) and occurred distally (at 0.26 of the scaled length of the muscle). Manipulating torque levels by decreasing the stimulation frequency at the same muscle length induced a decrease in torque ( approximately 20%) with a smaller effect on the level and no effect on the pattern of muscle deformation. During relaxation, distal segments actively shortened at the expense of proximal muscle segments, which elongated. The segments undergoing lengthening were nearer to motor endplates than segments undergoing shortening.In conclusion, the present study provides experimental data on magnitude of contraction-induced deformation needed for validation of numerical models. Local muscle deformation is heterogeneous both temporally and spatially and may be related to proximity to the motor endplates |
| Databáze: | OpenAIRE |
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