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Body weight, fluid, electrolyte, and hormonal changes in horses competing in 50- and 100-mile endurance rides.
Am J Vet Res. 1997 Mar; 58(3):303-9.AJ

Abstract

OBJECTIVE

To investigate effects of prolonged exercise on fluid and electrolyte losses in horses competing in 50- and 100-mile endurance competitions, with emphasis on recovery.

ANIMALS

Changes in body weight (BW); PCV; serum osmolality; plasma total protein, lactate, aldosterone, and serum electrolyte concentrations; and exchangeable cation content were measured in 12 and 7 horses before and after and before, during, and after successful completion of 50- and 100-mile endurance rides, respectively.

PROCEDURE

BW was measured by use of a portable load bar scale, and blood samples were collected during the hour before ride start, at ride finish, and after approximately 2 and 18 hours (overnight) of recovery for horses competing in the 50-mile ride. For horses competing in the 100-mile ride, BW was measured and blood samples were collected at the start; after 50, 67, and 84 miles of the ride; at the finish; and after approximately 12 hours (overnight) of recovery.

RESULTS

BW decreased by (mean +/- SEM) 3.6 +/- 0.0% and 4.9 +/- 0.8% in horses that successfully completed rides of 50 and 100 miles, respectively. After the overnight recovery period, BW was 4.3 +/- 0.5% and 3.9 +/- 0.8% lower than preride values for horses performing the 50- and 100-mile rides, respectively. A decrease in plasma volume during the ride was reflected by an increase in plasma total protein concentration, but both measures returned to preride values after overnight recovery. Serum osmolality and serum electrolyte concentrations decreased and aldosterone concentration increased during prolonged exercise. Aldosterone concentration peaked after overnight recovery.

CONCLUSION

Despite apparent rapid return of plasma volume and ionic composition to near normal values, substantial depletion of body fluid and electrolyte stores persists after an overnight recovery period in horses that successfully complete 50 or 100 miles of endurance competition.

Authors+Show Affiliations

Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman 99164-6610, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9055979

Citation

Schott, H C., et al. "Body Weight, Fluid, Electrolyte, and Hormonal Changes in Horses Competing in 50- and 100-mile Endurance Rides." American Journal of Veterinary Research, vol. 58, no. 3, 1997, pp. 303-9.
Schott HC, McGlade KS, Molander HA, et al. Body weight, fluid, electrolyte, and hormonal changes in horses competing in 50- and 100-mile endurance rides. Am J Vet Res. 1997;58(3):303-9.
Schott, H. C., McGlade, K. S., Molander, H. A., Leroux, A. J., & Hines, M. T. (1997). Body weight, fluid, electrolyte, and hormonal changes in horses competing in 50- and 100-mile endurance rides. American Journal of Veterinary Research, 58(3), 303-9.
Schott HC, et al. Body Weight, Fluid, Electrolyte, and Hormonal Changes in Horses Competing in 50- and 100-mile Endurance Rides. Am J Vet Res. 1997;58(3):303-9. PubMed PMID: 9055979.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Body weight, fluid, electrolyte, and hormonal changes in horses competing in 50- and 100-mile endurance rides. AU - Schott,H C,2nd AU - McGlade,K S, AU - Molander,H A, AU - Leroux,A J, AU - Hines,M T, PY - 1997/3/1/pubmed PY - 2001/3/28/medline PY - 1997/3/1/entrez SP - 303 EP - 9 JF - American journal of veterinary research JO - Am. J. Vet. Res. VL - 58 IS - 3 N2 - OBJECTIVE: To investigate effects of prolonged exercise on fluid and electrolyte losses in horses competing in 50- and 100-mile endurance competitions, with emphasis on recovery. ANIMALS: Changes in body weight (BW); PCV; serum osmolality; plasma total protein, lactate, aldosterone, and serum electrolyte concentrations; and exchangeable cation content were measured in 12 and 7 horses before and after and before, during, and after successful completion of 50- and 100-mile endurance rides, respectively. PROCEDURE: BW was measured by use of a portable load bar scale, and blood samples were collected during the hour before ride start, at ride finish, and after approximately 2 and 18 hours (overnight) of recovery for horses competing in the 50-mile ride. For horses competing in the 100-mile ride, BW was measured and blood samples were collected at the start; after 50, 67, and 84 miles of the ride; at the finish; and after approximately 12 hours (overnight) of recovery. RESULTS: BW decreased by (mean +/- SEM) 3.6 +/- 0.0% and 4.9 +/- 0.8% in horses that successfully completed rides of 50 and 100 miles, respectively. After the overnight recovery period, BW was 4.3 +/- 0.5% and 3.9 +/- 0.8% lower than preride values for horses performing the 50- and 100-mile rides, respectively. A decrease in plasma volume during the ride was reflected by an increase in plasma total protein concentration, but both measures returned to preride values after overnight recovery. Serum osmolality and serum electrolyte concentrations decreased and aldosterone concentration increased during prolonged exercise. Aldosterone concentration peaked after overnight recovery. CONCLUSION: Despite apparent rapid return of plasma volume and ionic composition to near normal values, substantial depletion of body fluid and electrolyte stores persists after an overnight recovery period in horses that successfully complete 50 or 100 miles of endurance competition. SN - 0002-9645 UR - https://www.unboundmedicine.com/medline/citation/9055979/Body_weight_fluid_electrolyte_and_hormonal_changes_in_horses_competing_in_50__and_100_mile_endurance_rides_ L2 - https://medlineplus.gov/bodyweight.html DB - PRIME DP - Unbound Medicine ER -