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The effects of intensity and duration of training on blood lactate concentrations during and after exercise
Author(s) -
EVANS D. L.,
RAINGER JOANNE E.,
HODGSON D. R.,
EATON M. D.,
ROSE R. J.
Publication year - 1995
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.1111/j.2042-3306.1995.tb04965.x
Subject(s) - blood lactate , treadmill , lactate threshold , zoology , vo2 max , exercise intensity , medicine , intensity (physics) , heart rate , lactic acid , interval training , chemistry , blood pressure , biology , physics , quantum mechanics , genetics , bacteria
Summary The effects of training intensity and duration on blood lactate concentrations during submaximal and after maximal treadmill exercise were investigated in 2 groups of 5 Thoroughbred horses. Horses were trained on a treadmill in either a ‘fast’ or ‘slow’ group. In the ‘fast’ group, all exercise after an initial warm‐up was at speeds which resulted in blood lactate concentrations in the range 4–8 mmol/l. In the ‘slow’ group, all training exercise was at half the speed but equal distance. Incremental speed treadmill tests were repeated after 1, 2, 3, 5, 7 and 9 weeks training. Treadmill speeds and oxygen uptake at blood lactate of 4 mmol/l (V La4 and V̇O 2 ‐4) and blood lactate concentration at 9 m/s (La 9 ) were measured. Blood was also collected at 2 or 5 min intervals after a run to fatigue at 115% of maximum oxygen uptake (V̇O 2max ). Peak and 10 min post exercise lactate concentrations were measured, and disappearance rate (mmol/l/min) calculated. Runs to fatigue were repeated after 5 and 9 weeks of training. Data were analysed by repeated measures ANCOVA. Mean ± s.e.m. V La4 increased from 7.0 ± 0.5 to 9.2 ± 0.2 m/s (P<0.001) and La 9 decreased from 8.0 ± 1.0 to 3.9 ± 0.3 mmol/l (P<0.001) over the 9 weeks training. The pooled V̇O 2 ‐4 increased from mean ± s.e.m. 96 ± 6.6 to 122 ± 5.6 ml/min/kg (P<0.01) after training. An increase in the pooled %V̇O 2max ‐4 from 79 ± 3.4% to 84 ± 2.4% after 9 weeks training was not statistically significant. There were no significant effects of training intensity on changes in V La4 , La 9 , or V̇O 2 ‐4 and no significant effects of training on lactate concentrations after exercise to fatigue at 115% V̇O 2max . The training induced decrease in blood lactate concentration during submaximal exercise is not dependent on intensity of exercise during training.