Peripheral and central fatigue after muscle-damaging exercise is muscle length dependent and inversely related |
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| Authors: | Albertas Skurvydas Marius Brazaitis Sigitas Kamandulis Saule Sipaviciene |
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| Institution: | 1. Institute of Sport Science and Innovations, Lithuanian Sports University, Kaunas, Lithuania;2. Department of Neurology, Lithuanian University of Health Sciences, Kaunas, Lithuania;1. Faculty of Human Sciences, Medical School Hamburg, Hamburg, Germany;2. Sport Science, Reykjavik University, Reykjavik, Iceland;3. Institute of Physical Education & Sport, University of Education, Karlsruhe, Germany;4. Bioscience Department, School of Physical Education of the Federal University of Rio de Janeiro (EEFD/UFRJ), Rio de Janeiro, Brazil;5. Institute of Applied Neuroscience (INA), Rio de Janeiro, Brazil;6. International Council of Sport Science and Physical Education (ICSSPE), Berlin, Germany;7. Panic and Respiration Lab, Institute of Psychiatry, Federal University of Rio de Janeiro (IPUB/UFRJ), Rio de Janeiro, Brazil;8. Physical Activity, Neuroscience, Physical Activity Sciences Postgraduate Program — Salgado de Oliveira University, Niterói, Brazil;9. Lithuanian Sports University, Kaunas, Lithuania;10. Institute of Sport Science, University of Bern, Switzerland;1. Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden;2. Institute of Sport Science and Innovations, Lithuanian Sports University, Kaunas, Lithuania;3. Institute of Sport Sciences and Physiotherapy, Faculty of Medicine, University of Tartu, Estonia;4. Heart, Vascular and Neurology Theme, Section for Cardiology, Karolinska University Hospital, Stockholm, Sweden |
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| Abstract: | Healthy untrained men performed 10 series of 12 knee eccentric extension repetitions (EE) at 160°/s. The maximal voluntary isometric contraction force of the quadriceps muscle, the maximal rate of electrically induced torque development (RTD) and relaxation (RTR), isokinetic concentric torque at 30°/s, the electrostimulation-induced torque at 20 and 100 Hz frequencies were established before and after EE at shorter and longer muscle lengths. Besides, voluntary activation (VA) index and central activation ratio (CAR) were tested. There was more peripheral fatigue than central after EE. We established more central fatigue as well as low frequency fatigue at a shorter muscle length compared to the longer muscle length. Relative RTD as well as relative RTR, improved after EE and did not depend on the muscle length. Finally, central fatigue is inversely significantly related with the eccentric torque reduction during eccentric exercise and with the changes in muscle torque induced by low frequency stimulation. |
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