Ingestion of Sodium Bicarbonate (NaHCO3 ) Following a Fatiguing Bout of Exercise Accelerates Postexercise Acid-Base Balance Recovery and Improves Subsequent High-Intensity Cycling Time to Exhaustion

International Journal of Sport Nutrition and Exercise Metabolism
Lewis A GoughMatthew F Higgins

Abstract

This study evaluated the ingestion of sodium bicarbonate (NaHCO3) on postexercise acid-base balance recovery kinetics and subsequent high-intensity cycling time to exhaustion. In a counterbalanced, crossover design, nine healthy and active males (age: 23 ± 2 years, height: 179 ± 5 cm, body mass: 74 ± 9 kg, peak mean minute power (Wpeak) 256 ± 45 W, peak oxygen uptake (V̇O2peak) 46 ± 8 ml.kg-1.min-1) performed a graded incremental exercise test, two familiarization and two experimental trials. Experimental trials consisted of cycling to volitional exhaustion (TLIM1) at 100% WPEAKon two occasions (TLIM1and TLIM2) interspersed by a 90 min passive recovery period. Using a double-blind approach, 30 min into a 90 min recovery period participants ingested either 0.3 g.kg-1body mass sodium bicarbonate (NaHCO3) or a placebo (PLA) containing 0.1 g.kg-1body mass sodium chloride (NaCl) mixed with 4 ml.kg-1tap water and 1 ml.kg-1orange squash. The mean differences between TLIM2and TLIM1was larger for PLA compared with NaHCO3(-53 ± 53 vs. -20 ± 48 s; p = .008, d = 0.7, CI =-0.3, 1.6), indicating superior subsequent exercise time to exhaustion following NaHCO3. Blood lactate [Bla-] was similar between treatments post TLIM1, but greater for Na...Continue Reading

Citations

Mar 18, 2021·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·William GurtonDavid G King
Sep 11, 2021·Journal of the International Society of Sports Nutrition·Jozo GrgicBill I Campbell

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