Repeated bouts of sprint running after induced alkalosis
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1991
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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MAN; SPRINTING; ALKALOSIS; LACTATE; ADAPTATION; RESPIRATION; SODIUM-BICARBONATE; SALT
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-366-303
(Last edited on
2002/02/27 18:45:01 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
Seven healthy male subjects performed 10 maximal 6-s sprints, separated by 30-s recovery periods, on a non-motorized treadmill. On two occasions, separated by 3 days, the subjects ingested a solution of either sodium bicarbonate (NsHCO3; alkaline) or sodium chloride (NaCl; placebo), 2.5 h prior to exercise. The doses were 0.3 g kg-1 body mass for the alkaline treatment and 1.5 g total for the placebo, dissolved in 500 ml of water. The order of testing was randomly assigned. Pre-exercise blood pH was 7.43 plus/minus 0.02 and 7.38 plus/minus 0.01 for the alkaline and placebo trials respectively. Performance indices (i.e. mean and peak power outputs and mean and peak running speeds) were significantly reduced as a result of the cumulative effects of successive sprints, but not significantly affected by the treatments. However, the total work done (i.e. mean power output) in the alkaline condition was 2 percent higher than that achieved in the placebo condition. Post-exercise blood lactate concentrations were higher for the alkaline treatment than for the placebo condition (15.3 plus/minus 3.7 vs 13.6 plus/minus 3.0 mM respectively, but blood pH was similar in both conditions (alkaline: 7.15 plus/minus 0.13; placebo: 7.09 plus/minus 0.11). In both conditions, a relationship was found between post exercise blood lactate and mean power output (alkaline: r=0.82), placebo: r=0.79. No significant differences were found in VE, VO2 and VCO2 between the two experimental conditions. This study demonstrates the alkali ingestion results in significant shifts in the acid-base balance of the blood, but has no effect on the power output during repeated bouts of brief maximal exercise.
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