Differences in rat skeletal muscles after incline and decline running

Differences in rat skeletal muscles after incline and decline running Abstract Rats were trained for 5 days by running on either an inclined or declined treadmill. Three days later, the rats were anesthetized, and angle-torque curves were plotted for the vastus intermedius muscles. The maximum active torque was generated at significantly greater muscle lengths for muscles from decline-trained rats compared with incline-trained rats. Sixteen muscles were then fixed and acid digested, and fiber lengths and sarcomere lengths were measured. The estimated average number of sarcomeres in series was greater in muscle fibers from decline-trained animals. Fourteen other muscles underwent a test series of lengthening contractions, all from the same knee angle. Torque fell less and the optimum angle shifted less for muscles from decline-trained animals, showing that the decline-trained muscles were more resistant to changes in mechanical parameters that indicate damage. These results support but do not prove the proposal that the lesser damage from a series of eccentric contractions seen in muscles trained by prior eccentric contractions is due to a greater number of sarcomeres in series. eccentric muscle damage sarcomeres delayed-onset muscle soreness Footnotes Address for reprint requests: D. Morgan, Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3168, Australia. Copyright © 1998 the American Physiological Society http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

Differences in rat skeletal muscles after incline and decline running

Journal of Applied Physiology, Volume 85 (1): 98 – Jul 1, 1998

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Publisher
The American Physiological Society
Copyright
Copyright © 2011 the American Physiological Society
ISSN
8750-7587
eISSN
1522-1601
Publisher site
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Abstract

Abstract Rats were trained for 5 days by running on either an inclined or declined treadmill. Three days later, the rats were anesthetized, and angle-torque curves were plotted for the vastus intermedius muscles. The maximum active torque was generated at significantly greater muscle lengths for muscles from decline-trained rats compared with incline-trained rats. Sixteen muscles were then fixed and acid digested, and fiber lengths and sarcomere lengths were measured. The estimated average number of sarcomeres in series was greater in muscle fibers from decline-trained animals. Fourteen other muscles underwent a test series of lengthening contractions, all from the same knee angle. Torque fell less and the optimum angle shifted less for muscles from decline-trained animals, showing that the decline-trained muscles were more resistant to changes in mechanical parameters that indicate damage. These results support but do not prove the proposal that the lesser damage from a series of eccentric contractions seen in muscles trained by prior eccentric contractions is due to a greater number of sarcomeres in series. eccentric muscle damage sarcomeres delayed-onset muscle soreness Footnotes Address for reprint requests: D. Morgan, Dept. of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3168, Australia. Copyright © 1998 the American Physiological Society

Journal

Journal of Applied PhysiologyThe American Physiological Society

Published: Jul 1, 1998

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