McConaghy F F, Hodgson D R, Evans D L, Rose R J
Department of Animal Health, University of Sydney, Camden, NSW, Australia.
Equine Vet J Suppl. 1995 Nov(20):158-64. doi: 10.1111/j.2042-3306.1995.tb05023.x.
Significant alterations in plasma electrolyte concentrations have been reported in horses following prolonged exercise, resulting from loss of hypertonic sweat. Sweat was collected from 10 horses undergoing a 10 week training programme; 5 at moderate intensity, to speeds of 10 m/s and 5 at low intensity, to speeds of 5 m/s. Sweat was collected from 2 sites in response to a submaximal exercise test (30 min at 50% VO2max and during an adrenaline infusion (dose mean +/- s.d.; 0.3 +/- 0.05 g/kg over 30 min). Sweat samples were analysed for sodium, chloride, potassium, protein, magnesium, calcium and urea concentrations. Sweat produced in response to exercise and adrenaline infusion was hypertonic and showed no significant differences in composition following training. However, the [NaCl] of sweat rose with increased duration of sweating. Sweat produced in response to adrenaline infusion was more dilute than that produced in response to exercise, which may be related to sympathetic outflow during exercise.
据报道，长时间运动后马匹的血浆电解质浓度会发生显著变化，这是由于高渗性汗液流失所致。从10匹接受为期10周训练计划的马匹身上采集汗液；5匹以中等强度训练，速度达到10米/秒，5匹以低强度训练，速度达到5米/秒。在次最大运动试验（在50%最大摄氧量下进行30分钟）和肾上腺素输注期间（剂量均值±标准差；30分钟内0.3±0.05克/千克），从2个部位采集汗液。对汗液样本进行钠、氯、钾、蛋白质、镁、钙和尿素浓度分析。运动和肾上腺素输注产生的汗液是高渗性的，训练后其成分没有显著差异。然而，汗液中的[NaCl]随着出汗时间的延长而升高。肾上腺素输注产生的汗液比运动产生的汗液更稀，这可能与运动期间的交感神经流出有关。
