Effect of Lactate Supplementation and Sodium Bicarbonate on 40-km Cycling Time Trial Performance

Abstract

39The use of nutritional supplements to improve sporting performance and increase training 40 adaptations is commonplace amongst athletes and is an expanding market in terms of product 41 choice and availability. The purpose of this study was to examine the effects of two ergogenic 42 aids with extracellular blood buffering potential, namely sodium bicarbonate (NaHCO 3 ) and a

Sodium Bicarbonate and High-Intensity-Cycling Capacity: Variability in Responses

“…Despite this, the reported effects are equivocal, with several studies reporting no effect on exercise performance and capacity 3,4,5,6,7 . Inconsistencies in the performance outcomes of sodium bicarbonate supplementation studies can be partly attributed to differing dosing regimens 4 , gastrointestinal (GI) discomfort experienced by some participants 8 , exercise models insufficient to be limited by hydrogen cation (H + ) accumulation 5 and individual variation in the response to supplementation 9 .…”

Effect of lactate supplementation on V̇O_2peak and onset of blood lactate accumulation: A double-blind, placebo-controlled trial

“…Indeed, Morris et al (2011) reported that consuming 120 mg/kg of body mass of lactate increased blood bicarbonate levels and improved exercise performance during high-intensity cycling ergometry to exhaustion. However, previous investigators who examined the effect of lactate supplementation on simulated cycling time trial performances, have been unable to provide evidence to support the LS theory (Bryner et al, 1998;Northgraves et al, 2014;Peveler & Palmer, 2012;Swensen et al, 1994). These mixed findings may be due to differences in exercise intensity, duration, and testing modalities (i.e., single exercise bouts versus repeat trials, time to exhaustion versus time trials).…”

“…Commercially available forms of nutritional ergogenic aids include sodium bicarbonate, β-alanine, and lactate supplements. An extensive review by McNaughton, Siegler, and Midgley (2008) highlighted more than 12 investigations demonstrating that chronic sodium Jourkesh, Ahmaidi, Keikha, Sadri, & Ojagi, 2011;McNaughton et al, 2008), there is mixed support for the use of lactate supplementation to improve aerobic performance (Bryner, Hornsby, Chetlin, Ullrich, & Yeater, 1998;Morris, Shafer, Fairbrother, & Woodall, 2011;Northgraves, Peart, Jordan, & Vince, 2014;Peveler & Palmer, 2012;Swensen, Crater, Bassett, & Howley, 1994). According to the lactate shuttle (LS) theory, lactate can be utilized in the Cori cycle of the liver and/or skeletal muscle, to synthesize glycogen or be converted into pyruvate and enter aerobic metabolism (Brooks, 2000).…”

“…Consequently, it is important to account for the contribution of pedaling rate during cycling trials. It remains unclear if previous investigators, who implemented cycling as a test modality (Morris et al, 2011;Northgraves et al, 2014;Peveler & Palmer, 2012), allowed their study participants to self-select pedaling rates and/or gear ratios since those pedaling rates or gear ratios were not reported.…”

Efeitos da suplementação crônica de lactato de cálcio e bicarbonato de sódio sobre desempenho físico em exercício intermitente de alta intensidade

“…Conforme a literatura tem apresentado, os estudos que investigaram o lactato, como um substrato energético, não apresentaram melhora no desempenho aeróbio (BRYNER et al, 1998;NORTHGRAVES et al, 2014;PEVELER e PALMER, 2012;SWENSEN et al, 1994). Contudo, apenas um estudo apresentou resultados positivos, com uma grande melhora de 25% no desempenho aeróbio (AZEVEDO et al, 2007).…”