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Sweat composition in Arabian horses performing endurance exercise on forage-based, low Na rations.
Equine Vet J Suppl. 2010 NovEV

Abstract

REASONS FOR PERFORMING STUDY

Excessive sweat loss during endurance exercise may lead to electrolyte disturbances and previous research suggests dietary factors may affect hydration status. While investigating the effect of dietary fibre type on hydration status, sweat samples were collected which allowed for the evaluation of sweat composition in horses consuming forage-based, low sodium (Na) rations.

OBJECTIVE

To investigate sweat composition in Arabian horses performing endurance type exercise while fed forage-based, rations low in Na.

METHODS

Six 2-year-old Arabian horses were fed, according to a replicated 3 × 3 Latin square, either grass hay (G), 50:50 grass hay:alfalfa hay (GA), or 50:50 grass hay: chopped fibres (GM) without any additional electrolyte supplementation. After 14 days on each diet, horses performed a 60 km treadmill exercise test. Sweat was collected from sealed pouches on the dorsal thorax after each of four 15 km exercise bouts.

RESULTS

Intake (g/day) of Na (2.5 ± 0.4), Cl (72 ± 16), and Mg (18 ± 3) were not different between diets but K and Ca intakes (g/day) were greater (P < 0.05) on GA (246 ± 35; 101 ± 14) than G (176 ± 38; 59 ± 14) or GM (168 ± 33; 62 ± 15). There was no effect of diet on sweat pH (7.65 ± 0.04) or concentrations (mmol/l) of K (46 ± 3), Cl (133 ± 7), Ca (8.5 ± 1.1), or Mg (2.3 ± 0.3); yet diet did influence sweat Na concentration (P < 0.05, G 88 ± 5 mmol/l, GA 104 ± 5, GM 96 ± 6). Na and Cl concentrations were lower than those previously reported.

CONCLUSIONS

Differences in sweat constituents due to diet were observed, but more importantly both Na and Cl concentration are lower than those previously reported perhaps due to low dietary Na intake or breed of animal.

Authors+Show Affiliations

West Virginia University, USA; and ‡Mars HorseCare UK, Leics, UK. holly.spooner@mail.wvu.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21059034

Citation

Spooner, H S., et al. "Sweat Composition in Arabian Horses Performing Endurance Exercise On Forage-based, Low Na Rations." Equine Veterinary Journal. Supplement, 2010, pp. 382-6.
Spooner HS, Nielsen BD, Schott HC, et al. Sweat composition in Arabian horses performing endurance exercise on forage-based, low Na rations. Equine Vet J Suppl. 2010.
Spooner, H. S., Nielsen, B. D., Schott, H. C., & Harris, P. A. (2010). Sweat composition in Arabian horses performing endurance exercise on forage-based, low Na rations. Equine Veterinary Journal. Supplement, (38), 382-6. https://doi.org/10.1111/j.2042-3306.2010.00208.x
Spooner HS, et al. Sweat Composition in Arabian Horses Performing Endurance Exercise On Forage-based, Low Na Rations. Equine Vet J Suppl. 2010;(38)382-6. PubMed PMID: 21059034.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sweat composition in Arabian horses performing endurance exercise on forage-based, low Na rations. AU - Spooner,H S, AU - Nielsen,B D, AU - Schott,H C,2nd AU - Harris,P A, PY - 2010/11/10/entrez PY - 2011/5/27/pubmed PY - 2011/8/19/medline SP - 382 EP - 6 JF - Equine veterinary journal. Supplement JO - Equine Vet J Suppl IS - 38 N2 - REASONS FOR PERFORMING STUDY: Excessive sweat loss during endurance exercise may lead to electrolyte disturbances and previous research suggests dietary factors may affect hydration status. While investigating the effect of dietary fibre type on hydration status, sweat samples were collected which allowed for the evaluation of sweat composition in horses consuming forage-based, low sodium (Na) rations. OBJECTIVE: To investigate sweat composition in Arabian horses performing endurance type exercise while fed forage-based, rations low in Na. METHODS: Six 2-year-old Arabian horses were fed, according to a replicated 3 × 3 Latin square, either grass hay (G), 50:50 grass hay:alfalfa hay (GA), or 50:50 grass hay: chopped fibres (GM) without any additional electrolyte supplementation. After 14 days on each diet, horses performed a 60 km treadmill exercise test. Sweat was collected from sealed pouches on the dorsal thorax after each of four 15 km exercise bouts. RESULTS: Intake (g/day) of Na (2.5 ± 0.4), Cl (72 ± 16), and Mg (18 ± 3) were not different between diets but K and Ca intakes (g/day) were greater (P < 0.05) on GA (246 ± 35; 101 ± 14) than G (176 ± 38; 59 ± 14) or GM (168 ± 33; 62 ± 15). There was no effect of diet on sweat pH (7.65 ± 0.04) or concentrations (mmol/l) of K (46 ± 3), Cl (133 ± 7), Ca (8.5 ± 1.1), or Mg (2.3 ± 0.3); yet diet did influence sweat Na concentration (P < 0.05, G 88 ± 5 mmol/l, GA 104 ± 5, GM 96 ± 6). Na and Cl concentrations were lower than those previously reported. CONCLUSIONS: Differences in sweat constituents due to diet were observed, but more importantly both Na and Cl concentration are lower than those previously reported perhaps due to low dietary Na intake or breed of animal. UR - https://www.unboundmedicine.com/medline/citation/21059034/Sweat_composition_in_Arabian_horses_performing_endurance_exercise_on_forage_based_low_Na_rations_ L2 - https://doi.org/10.1111/j.2042-3306.2010.00208.x DB - PRIME DP - Unbound Medicine ER -