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Effect of show jumping training on the development of locomotory muscle in young horses.
Am J Vet Res. 2007 Nov; 68(11):1232-8.AJ

Abstract

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(+)-ATPase 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 IIa and a decrease in type IIad; 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 IId 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.

Authors+Show Affiliations

Department of Pathobiology, Faculty of Veterinary Medicine, Utrecht University, 3508 TD Utrecht, The Netherlands.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17975979

Citation

Rietbroek, Nancy J., et al. "Effect of Show Jumping Training On the Development of Locomotory Muscle in Young Horses." American Journal of Veterinary Research, vol. 68, no. 11, 2007, pp. 1232-8.
Rietbroek NJ, Dingboom EG, Joosten BJ, et al. Effect of show jumping training on the development of locomotory muscle in young horses. Am J Vet Res. 2007;68(11):1232-8.
Rietbroek, N. J., Dingboom, E. G., Joosten, B. J., Eizema, K., & Everts, M. E. (2007). Effect of show jumping training on the development of locomotory muscle in young horses. American Journal of Veterinary Research, 68(11), 1232-8.
Rietbroek NJ, et al. Effect of Show Jumping Training On the Development of Locomotory Muscle in Young Horses. Am J Vet Res. 2007;68(11):1232-8. PubMed PMID: 17975979.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of show jumping training on the development of locomotory muscle in young horses. AU - Rietbroek,Nancy J, AU - Dingboom,Elizabeth G, AU - Joosten,Brian J L J, AU - Eizema,Karin, AU - Everts,Maria E, PY - 2007/11/3/pubmed PY - 2008/1/11/medline PY - 2007/11/3/entrez SP - 1232 EP - 8 JF - American journal of veterinary research JO - Am J Vet Res VL - 68 IS - 11 N2 - 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(+)-ATPase 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 IIa and a decrease in type IIad; 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 IId 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. SN - 0002-9645 UR - https://www.unboundmedicine.com/medline/citation/17975979/Effect_of_show_jumping_training_on_the_development_of_locomotory_muscle_in_young_horses_ L2 - https://avmajournals.avma.org/doi/10.2460/ajvr.68.11.1232?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -