caa a22 4500 469054808 CHVBK 20180323132840.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00705081 doi (NATIONALLICENCE)springer-10.1007/BF00705081 Phosphorus-31 nuclear magnetic resonance study on the effects of endurance training in rat skeletal muscle [Elektronische Daten] [Shin-ya Kuno, Masayoshi Akisada, Fumiyuki Mitsumori] Summary: To evaluate changes in muscle energetics following endurance training, we measured phosphorus-31 nuclear magnetic resonance (31P NMR) spectra on rat muscle in vivo before and after training in the same animals. The endurance training lasted for 3 months. The31P NMR spectra were obtained serially at rest, during exercise by electrical stimulation, and during recovery. Intramuscular phosphocreatine (PCr), inorganic phosphate (Pi, adenosine 5′-triphosphate (ATP) and pH were determined from the NMR spectra. The ratio of PCr : (PCr + Pi) at rest showed no difference between the trained and control groups even after 3 months of training. During exercise, however, this ratio was significantly higher in the trained group than in the control group. The ratio also recovered more rapidly after exercise in the trained group. The intramuscular pH decreased slightly by approximately 0.1 pH unit during exercise but did not show a significant difference between the groups. These results indicated that endurance training of 3 months duration improved the ATP supply system in the muscle. They also demonstrated that31P NMR is a potent method for evaluating the effects of training in the same individuals. Springer-Verlag, 1992 Phosphorus-31 nuclear magnetic resonance nationallicence Muscle metabolism nationallicence Phosphocreatine nationallicence Adenosine 5′-triphosphate nationallicence Endurance training nationallicence Muscle fibre type nationallicence Kuno Shin-ya National Institute for Environmental Studies, 305, Tsukuba, Ibaraki, Japan aut Akisada Masayoshi Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, 305, Tsukuba, Ibaraki, Japan aut Mitsumori Fumiyuki National Institute for Environmental Studies, 305, Tsukuba, Ibaraki, Japan aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/2(1992-03-01), 197-201 0301-5548 65:2<197 1992 65 421 https://doi.org/10.1007/BF00705081 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00705081 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kuno Shin-ya National Institute for Environmental Studies, 305, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Akisada Masayoshi Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, 305, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 700 1- Mitsumori Fumiyuki National Institute for Environmental Studies, 305, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 65/2(1992-03-01), 197-201 0301-5548 65:2<197 1992 65 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer