Chronic lactate supplementation does not improve blood buffering capacity and repeated high-intensity exercise

Oliveira, LF, de Salles Painelli, V, Nemezio, K, Gonçalves, LS, Yamaguchi, G, Saunders, B, Gualano, B and Artioli, GG ORCID: 0000-0001-8463-2213, 2016. Chronic lactate supplementation does not improve blood buffering capacity and repeated high-intensity exercise. Scandinavian Journal of Medicine & Science in Sports. ISSN 0905-7188

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Since there is conflicting data on the buffering and ergogenic properties of calcium lactate (CL), we investigated the effect of chronic CL supplementation on blood pH, bicarbonate, and high-intensity intermittent exercise performance. Sodium bicarbonate (SB) was used as a positive control. Eighteen athletes participated in this double-blind, placebo-controlled, crossover, fully counterbalanced study. All participants underwent three different treatments: placebo (PL), CL, and SB. The dose was identical in all conditions: 500 mg/kg BM divided into four daily individual doses of 125 mg/kg BM, for five consecutive days, followed by a 2-7-day washout period. On the fifth day of supplementation, individuals undertook four 30-s Wingate bouts for upper body with 3-min recovery between bouts. Total mechanical work (TMW) for the overall protocol and for the initial (1st+2nd) and final (3rd+4th) bouts was determined at each session. Blood pH, bicarbonate, and lactate levels were determined at rest, immediately and 5 min after exercise. CL supplementation did not affect performance (P > 0.05 for the overall TMW as well for initial and final bouts), nor did it affect blood bicarbonate and pH prior to exercise. SB supplementation improved performance by 2.9% for overall TMW (P = 0.02) and 5.9% in the 3rd+4th bouts (P = 0001). Compared to the control session, SB also promoted higher increases in blood bicarbonate than CL and PL (+0.03 ± 0.04 vs +0.009 ± 0.02 and +0.01 ± 0.03, respectively). CL supplementation was not capable of enhancing high-intensity intermittent performance or changing extracellular buffering capacity challenging the notion that this dietary supplement is an effective buffering agent.

Item Type: Journal article
Publication Title: Scandinavian Journal of Medicine & Science in Sports
Creators: Oliveira, L.F., de Salles Painelli, V., Nemezio, K., Gonçalves, L.S., Yamaguchi, G., Saunders, B., Gualano, B. and Artioli, G.G.
Publisher: Wiley-Blackwell
Date: 23 November 2016
ISSN: 0905-7188
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 20 Feb 2017 14:35
Last Modified: 19 Sep 2017 09:45

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