caa a22 4500 469055022 CHVBK 20180323132841.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF00376438 doi (NATIONALLICENCE)springer-10.1007/BF00376438 Muscle fatigue and efficiency in relation to interval duration of successive contractions [Elektronische Daten] [M. Lodder, A. de Haan] Summary: The work output, energy consumption and efficiency during repetitive dynamic contractions were calculated for rat extensor digitorum longus muscle. The muscles performed 40 successive dynamic contractions at 37°C (with occluded bloodflow) with interval durations of either 500, 250 or 167 ms. The muscle-tendon complexes were allowed to shorten at the velocity at which they could exert their highest power output (50 mm · s−1). Work output in the first contraction was the same among the three groups with different interval durations. The reduction in work output during the series of contractions differed among the groups, mainly in the last part of the exercise period. In the group with the longest interval duration, work output steadily decreased over the whole contraction period and at the end was approximately 72% of the output in the first contraction. In contrast, after the 30th contraction, work output decreased at a significantly higher rate of approximately 3% of each contraction in the groups with the intermediate and the shortest interval duration. After the last contraction, work output in these groups was approximately 52% of the work output in the first contraction. These differences in fatigue coincided with differences in the reduction in adenosine 5′-triphosphate and the production of inosine-5′-monophos-phate. Total work output was not significantly different among the three groups with different interval durations, indicating that the different reductions in work output in the last contractions only had a minor influence on total work output of all 40 contractions. Also high-energy phosphate consumption and efficiency were not significantly different over these three exercise periods. Thus with the protocol used no interval dependent pattern of efficiency could be detected. Springer-Verlag, 1992 Muscle nationallicence Fatigue nationallicence Efficiency nationallicence Interval duration nationallicence Lodder M. Department of Muscle and Exercise Phsiology, Faculty of Human Movement Sciences, Vrije Universiteit, Meibergdreef 15, NL-1105 AZ, Amsterdam, The Netherlands aut de Haan A. Department of Muscle and Exercise Phsiology, Faculty of Human Movement Sciences, Vrije Universiteit, Meibergdreef 15, NL-1105 AZ, Amsterdam, The Netherlands aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/1(1992-01-01), 42-46 0301-5548 64:1<42 1992 64 421 https://doi.org/10.1007/BF00376438 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00376438 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lodder M. Department of Muscle and Exercise Phsiology, Faculty of Human Movement Sciences, Vrije Universiteit, Meibergdreef 15, NL-1105 AZ, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- de Haan A. Department of Muscle and Exercise Phsiology, Faculty of Human Movement Sciences, Vrije Universiteit, Meibergdreef 15, NL-1105 AZ, Amsterdam, The Netherlands aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/1(1992-01-01), 42-46 0301-5548 64:1<42 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer