期刊
AMERICAN JOURNAL OF VETERINARY RESEARCH
卷 68, 期 11, 页码 1232-1238出版社
AMER VETERINARY MEDICAL ASSOC
DOI: 10.2460/ajvr.68.11.1232
关键词
-
Objective-To investigate whether training for show jumping that is commenced early after birth affects the characteristics of equine locomotory muscle. Animals-19 Dutch Warmblood horses. Procedures-Horses were assigned to a trained or not trained (control) group. After weaning, training (free jumping [2 d/wk] that was alternated with a 20-minute period of exercise in a mechanical rotating walker [3 d/wk]) was started and continued until horses were 3 years old. Fiber type composition (determined from myosin heavy chain [MyHC] content), fiber area, diffusion index (area supplied by 1 capillary), citrate synthase activity, and Na+,K+ -ATIPase content were assessed in gluteus medius muscle specimens collected at 0.5, 1, 2, and 3 years. Results-Developmental changes included an increase in MyHC fiber type Ila and a decrease in type Ilad; increases in fiber area, diffusion index, and citrate synthase activity- and a decrease in Na+,K+-ATPase content. The MyHC fiber type I and type Ild were detected in high and low proportions, respectively. Training increased Na+,K+-ATPase content, but did not affect other variables. Conclusions and Clinical Relevance-In horses, show jumping training at an early age resulted in increased Na+,K+-ATPase content of the deep portions of the gluteus medius muscle. The lack of training effects on the other muscle characteristics can partly be explained by the fact that an appropriate (aerobic) fiber type composition was already established at training commencement. These data also suggested that the developmental changes in equine muscle represent sufficient adaptation to meet the demands of this specific training.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据