Sodium bicarbonate ingestion improves time-to-exhaustion cycling performance and alters estimated energy system contribution: a dose-response investigation.

GURTON, William H., GOUGH, Lewis A., SPARKS, S. Andy, FAGHY, Mark A. and REED, Katharine E. (2020). Sodium bicarbonate ingestion improves time-to-exhaustion cycling performance and alters estimated energy system contribution: a dose-response investigation. Frontiers in nutrition, 7, p. 154.

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Abstract

This study investigated the effects of two sodium bicarbonate (NaHCO₃) doses on estimated energy system contribution and performance during an intermittent high-intensity cycling test (HICT), and time-to-exhaustion (TTE) exercise. Twelve healthy males (stature: 1.75 ± 0.08 m; body mass: 67.5 ± 6.3 kg; age: 21.0 ± 1.4 years; maximal oxygen consumption: 45.1 ± 7.0 ml.kg.min^-1) attended four separate laboratory visits. Maximal aerobic power (MAP) was identified from an incremental exercise test. During the three experimental visits, participants ingested either 0.2 g.kg^-1 BM NaHCO₃ (SBC2), 0.3 g.kg^-1 BM NaHCO₃ (SBC3), or 0.07 g.kg^-1 BM sodium chloride (placebo; PLA) at 60 min pre-exercise. The HICT involved 3 × 60 s cycling bouts (90, 95, 100% MAP) interspersed with 90 s recovery, followed by TTE cycling at 105% MAP. Blood lactate was measured after each cycling bout to calculate estimates for glycolytic contribution to exercise. Gastrointestinal (GI) upset was quantified at baseline, 30 and 60 min post-ingestion, and 5 min post-exercise. Cycling TTE increased for SBC2 (+20.2 s; <i>p</i> = 0.045) and SBC3 (+31.9 s; <i>p</i> = 0.004) compared to PLA. Glycolytic contribution increased, albeit non-significantly, during the TTE protocol for SBC2 (+7.77 kJ; <i>p</i> = 0.10) and SBC3 (+7.95 kJ; <i>p</i> = 0.07) compared to PLA. GI upset was exacerbated post-exercise after SBC3 for nausea compared to SBC2 and PLA (<i>p</i> < 0.05), whilst SBC2 was not significantly different to PLA for any symptom (<i>p</i> > 0.05). Both NaHCO₃ doses enhanced cycling performance and glycolytic contribution, however, higher doses may maximize ergogenic benefits.

Item Type:	Article
Uncontrolled Keywords:	anaerobic; ergogenic aid; high-intensity exercise; alkalosis; fatigue; extracellular buffer; alkalosis; anaerobic; ergogenic aid; extracellular buffer; fatigue; high-intensity exercise; 1001 Agricultural Biotechnology; 1111 Nutrition and Dietetics; 3210 Nutrition and dietetics
Identification Number:	https://doi.org/10.3389/fnut.2020.00154
Page Range:	p. 154
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	08 Aug 2023 11:54
Last Modified:	11 Oct 2023 12:46
URI:	https://shura.shu.ac.uk/id/eprint/32009

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