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Novel myosin isoform in nuclear chain fibers of rat muscle spindles produced in response to endurance swimming

Novel myosin isoform in nuclear chain fibers of rat muscle spindles produced in response to... CHIE NORIAKI Nagoya FUJITSUKA, FUJITSUKA University KEISUKE KAWAKAMI, Showa-ku, NORIKO OZAWA, of Physiology, School of Medicine, Nagoya 466, Japan YOSHIMURA, ATSUSHI, CHIE FUJITSUKA, KEISUKE KAWAKAMI, N~RIK~ UZAWA, HANNU OJALA, AND NORIAKI FUJITSUKA. Novel myosin isoform in nuclear s of rat muscle spindles produced in response to endurance swimming. J. Appl. Physiol. 73(S):1925-1931,1992.-With the of myosin adenosinetriphosphatase(ATPase) and immunofluorescence staining methods,the adaptive responses intrafusal and exof trafusal s to endurance swimming were studied in frozen sections of rat eus() and extensor digitorum longus () muscles.Glycogen depletion confirmed muscle fatigue at the end of a standardized bout of exercise. No significant age-dependentchangesin myosin isoforms were detected in any s. The 12-wk training increasedtype I s by 10.9% in the and type IIa s in the by 16.6%. In trained muscle sections,both staining methods identified a , expressedthe sameas the myosin isoform in the bag, . However, no exercise-changeof myosin isoform profile wasfound in the bag, and bag, s. Myosin ATPase(and immunofluorescence)staining showedthe percentage of s increasedfrom 0 to 6.7% (5.6%) after 6 wk of training and to 19.2% (14.1%) after 12 wk of training and that it was still at 6.1% (4.2%) 10 wks after training. A novel myosin isoform http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

Novel myosin isoform in nuclear chain fibers of rat muscle spindles produced in response to endurance swimming

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Publisher
The American Physiological Society
Copyright
Copyright © 1992 the American Physiological Society
ISSN
8750-7587
eISSN
1522-1601
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Abstract

CHIE NORIAKI Nagoya FUJITSUKA, FUJITSUKA University KEISUKE KAWAKAMI, Showa-ku, NORIKO OZAWA, of Physiology, School of Medicine, Nagoya 466, Japan YOSHIMURA, ATSUSHI, CHIE FUJITSUKA, KEISUKE KAWAKAMI, N~RIK~ UZAWA, HANNU OJALA, AND NORIAKI FUJITSUKA. Novel myosin isoform in nuclear s of rat muscle spindles produced in response to endurance swimming. J. Appl. Physiol. 73(S):1925-1931,1992.-With the of myosin adenosinetriphosphatase(ATPase) and immunofluorescence staining methods,the adaptive responses intrafusal and exof trafusal s to endurance swimming were studied in frozen sections of rat eus() and extensor digitorum longus () muscles.Glycogen depletion confirmed muscle fatigue at the end of a standardized bout of exercise. No significant age-dependentchangesin myosin isoforms were detected in any s. The 12-wk training increasedtype I s by 10.9% in the and type IIa s in the by 16.6%. In trained muscle sections,both staining methods identified a , expressedthe sameas the myosin isoform in the bag, . However, no exercise-changeof myosin isoform profile wasfound in the bag, and bag, s. Myosin ATPase(and immunofluorescence)staining showedthe percentage of s increasedfrom 0 to 6.7% (5.6%) after 6 wk of training and to 19.2% (14.1%) after 12 wk of training and that it was still at 6.1% (4.2%) 10 wks after training. A novel myosin isoform

Journal

Journal of Applied Physiology – The American Physiological Society

Published: Nov 1, 1992

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