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Journal of equine science2009; 20(3); 33-40; doi: 10.1294/jes.20.33

Sarcoplasmic Reticulum Ca(2+)-ATPase Activity and Glycogen Content in Various Fiber Types after Intensive Exercise in Thoroughbred Horses.

Abstract: To find a new parameter indicating muscle fitness in Thoroughbred horses, we examined time-dependent recovery of glycogen content and sarcoplasmic reticulum (SR) Ca(2+)-ATPase activity of skeletal muscle after intensive treadmill running. Two repeated 50-sec running sessions (13 m/sec) were performed on a flat treadmill (approximately 90%VO2max). Muscle samples of the middle gluteal muscle were taken before exercise (pre) and 1 min, 20 min, 60 min, and 24 hr after exercise. Muscle fiber type composition was determined in the pre muscle samples by immunohistochemical staining with monoclonal antibody to myosin heavy chain. SR Ca(2+)-ATPase activity of the muscle and glycogen content of each muscle fiber type were determined with biochemical analysis and quantitative histochemical staining, respectively. As compared to the pre value, the glycogen content of each muscle fiber type was reduced by 15-27% at 1 min, 20 min, and 60 min after the exercise and recovered to the pre value at 24 hr after exercise test. These results indicate that 24 hr is enough time to recover glycogen content after short-term intensive exercise. The mean value of the SR Ca(2+)-ATPase activity showed a slight decrease (not significant) immediately after exercise, and complete recovery at 60 min after exercise. There were no significant relationship between the changes in glycogen content of each muscle fiber type and SR Ca(2+)-ATPase. Although further studies are needed, SR Ca(2+)-ATPase is not a useful parameter to detect muscle fitness, at least in Thoroughbred horses.
Publication Date: 2009-10-23 PubMed ID: 24833967PubMed Central: PMC4013961DOI: 10.1294/jes.20.33Google Scholar: Lookup
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Summary

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The research investigates the recovery of glycogen content and sarcoplasmic reticulum (SR) Ca(2+)-ATPase activity in different muscle fibers of Thoroughbred horses after intense exercise, aiming to find a means to determine muscle fitness.

Exercise Method and Sample Collection

  • The intensive exercise was conducted using a treadmill, where the horses underwent two bouts of 50-second running sessions at 13 m/sec, which is about 90% of their VO2max, an indicator of aerobic fitness.
  • Samples of the middle gluteal muscle were taken from the horses before the start of the exercise (pre) and at various time points after the exercise — 1 min, 20 min, 60 min, and 24 hr.

Fiber Type and Analysis

  • The muscle fiber type was determined in the pre-exercise samples using immunohistochemical staining, a technique to visualize specific proteins, with a monoclonal antibody against myosin heavy chain.
  • The SR Ca(2+)-ATPase activity of the muscle and the glycogen content of each muscle fiber type were analyzed using a biochemical analysis and quantitative histochemical staining respectively.

Results and Conclusion

  • The glycogen content of each muscle fiber type was found to be reduced by 15-27% within the first hour after exercise but it returned to its pre-exercise level 24 hours after the exercise. This suggests that a full day is sufficient for glycogen recovery after short-term intensive exercise in horses.
  • There was a slight (although not significant) decrease in the mean value of the SR Ca(2+)-ATPase activity immediately after the exercise, which completely recovered 60 minutes after exercising.
  • No significant relationship was observed between the fluctuations in the glycogen content of each muscle fiber type and SR Ca(2+)-ATPase activity.
  • The study concludes that while further investigation is necessary, SR Ca(2+)-ATPase activity does not seem to be a convincing parameter to gauge muscle fitness, at least in Thoroughbred horses.

Cite This Article

APA
Minami Y, Yamano S, Kawai M, Hiraga A, Miyata H. (2009). Sarcoplasmic Reticulum Ca(2+)-ATPase Activity and Glycogen Content in Various Fiber Types after Intensive Exercise in Thoroughbred Horses. J Equine Sci, 20(3), 33-40. https://doi.org/10.1294/jes.20.33

Publication

ISSN: 1340-3516
NlmUniqueID: 9503751
Country: Japan
Language: English
Volume: 20
Issue: 3
Pages: 33-40

Researcher Affiliations

Minami, Yoshio
  • Biological Sciences, Graduate School of Medicine, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan.
Yamano, Seiko
  • Science Research Center, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8511, Japan.
Kawai, Minako
  • Biological Sciences, Graduate School of Medicine, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan.
Hiraga, Atsushi
  • Equine Research Institute, Japan Racing Association, 321-4 Tokami-cho, Utsunomiya, Tochigi 320-0856, Japan.
Miyata, Hirofumi
  • Biological Sciences, Graduate School of Medicine, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan.

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