AndrewS
05-18-2005, 09:02 AM
Nice little study. . .
May 13, 2005 — Sodium bicarbonate (NaHCO3) ingestion improves prolonged intermittent sprint performance, according to the results of a small randomized trial published in the May issue of Medicine and Science in Sports and Exercise.
"Previous studies have shown that induced metabolic alkalosis, via sodium bicarbonate (NaHCO3) ingestion, can improve short-term, repeated-sprint ability," write David Bishop, PhD, from the University of Western Australia in Crawley, and colleagues. "It was hypothesized that NaHCO3 ingestion would enhance the performance of the prolonged intermittent-sprint test (IST).
In this study, seven female team-sport athletes ingested two doses of either 0.2 g/kg of NaHCO3 or 0.138 g/kg of NaCl (placebo), in a double-blind, random, counterbalanced order, 90 and 20 minutes before performing the IST on a cycle ergometer. Mean age was 19 ± 1 years, and mean peak oxygen consumption (VO2peak) was 45.3 ± 3.1 mL/kg per minute. The IST consisted of two 36-minute halves of repeated blocks approximately two minutes long: all-out four-second sprint, 100 seconds of active recovery at 35% Vo2peak, and 20 seconds of rest. Subjects provided capillary blood samples drawn from the earlobe before ingestion, and before, during, and after each half of the IST. Throughout the IST, VO2peak was also recorded at regular intervals.
Mean plasma bicarbonate concentration (HCO3-) was 22.6 ± 0.9 mmol/L at rest, and at 90 minutes after ingestion it was 21.4 ± 1.5 mmol/L for placebo and 28.9 ± 2.8 mmol/L for NaHCO3 (P < .05). Plasma HCO3- during the NaHCO3 condition remained significantly higher throughout the IST compared with both placebo and preingestion. After NaHCO3 ingestion, there was a trend toward improved total work in the second (P = .08), but not first, half of the IST. After NaHCO3 ingestion, study subjects also completed significantly more work in seven of 18 second-half four-second sprints.
"The results of this study suggest that NaHCO3 ingestion can improve intermittent-sprint performance and may be a useful supplement for team-sport athletes," the authors write. "The preexercise ingestion of NaHCO3 affected a significant increase in the extracellular [HCO3-] and improved the performance of the IST."
Med Science Sports Exerc.2005;37:759-767
May 13, 2005 — Sodium bicarbonate (NaHCO3) ingestion improves prolonged intermittent sprint performance, according to the results of a small randomized trial published in the May issue of Medicine and Science in Sports and Exercise.
"Previous studies have shown that induced metabolic alkalosis, via sodium bicarbonate (NaHCO3) ingestion, can improve short-term, repeated-sprint ability," write David Bishop, PhD, from the University of Western Australia in Crawley, and colleagues. "It was hypothesized that NaHCO3 ingestion would enhance the performance of the prolonged intermittent-sprint test (IST).
In this study, seven female team-sport athletes ingested two doses of either 0.2 g/kg of NaHCO3 or 0.138 g/kg of NaCl (placebo), in a double-blind, random, counterbalanced order, 90 and 20 minutes before performing the IST on a cycle ergometer. Mean age was 19 ± 1 years, and mean peak oxygen consumption (VO2peak) was 45.3 ± 3.1 mL/kg per minute. The IST consisted of two 36-minute halves of repeated blocks approximately two minutes long: all-out four-second sprint, 100 seconds of active recovery at 35% Vo2peak, and 20 seconds of rest. Subjects provided capillary blood samples drawn from the earlobe before ingestion, and before, during, and after each half of the IST. Throughout the IST, VO2peak was also recorded at regular intervals.
Mean plasma bicarbonate concentration (HCO3-) was 22.6 ± 0.9 mmol/L at rest, and at 90 minutes after ingestion it was 21.4 ± 1.5 mmol/L for placebo and 28.9 ± 2.8 mmol/L for NaHCO3 (P < .05). Plasma HCO3- during the NaHCO3 condition remained significantly higher throughout the IST compared with both placebo and preingestion. After NaHCO3 ingestion, there was a trend toward improved total work in the second (P = .08), but not first, half of the IST. After NaHCO3 ingestion, study subjects also completed significantly more work in seven of 18 second-half four-second sprints.
"The results of this study suggest that NaHCO3 ingestion can improve intermittent-sprint performance and may be a useful supplement for team-sport athletes," the authors write. "The preexercise ingestion of NaHCO3 affected a significant increase in the extracellular [HCO3-] and improved the performance of the IST."
Med Science Sports Exerc.2005;37:759-767