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High-Intensity Interval Training Augments Muscle Carnosine in the Absence of Dietary Beta-alanine Intake.

Abstract：

PURPOSE:Cross-sectional studies suggest that training can increase muscle carnosine (MCarn), although longitudinal studies have failed to confirm this. A lack of control for dietary β-alanine intake or muscle fiber type shifting may have hampered their conclusions. The purpose of the present study was to investigate the effects of high-intensity interval training (HIIT) on MCarn. METHODS:Twenty vegetarian men were randomly assigned to a control (CON) (n = 10) or HIIT (n = 10) group. High-intensity interval training was performed on a cycle ergometer for 12 wk, with progressive volume (6-12 series) and intensity (140%-170% lactate threshold [LT]). Muscle carnosine was quantified in whole-muscle and individual fibers; expression of selected genes (CARNS, CNDP2, ABAT, TauT, and PAT1) and muscle buffering capacity in vitro (βmin vitro) were also determined. Exercise tests were performed to evaluate total work done, V˙O2max, ventilatory thresholds (VT) and LT. RESULTS:Total work done, VT, LT, V˙O2max, and βmin vitro were improved in the HIIT group (all P < 0.05), but not in CON (P > 0.05). MCarn (in mmol·kg dry muscle) increased in the HIIT (15.8 ± 5.7 to 20.6 ± 5.3; P = 0.012) but not the CON group (14.3 ± 5.3 to 15.0 ± 4.9; P = 0.99). In type I fibers, MCarn increased in the HIIT (from 14.4 ± 5.9 to 16.8 ± 7.6; P = 0.047) but not the CON group (from 14.0 ± 5.5 to 14.9 ± 5.4; P = 0.99). In type IIa fibers, MCarn increased in the HIIT group (from 18.8 ± 6.1 to 20.5 ± 6.4; P = 0.067) but not the CON group (from 19.7 ± 4.5 to 18.8 ± 4.4; P = 0.37). No changes in gene expression were shown. CONCLUSIONS:In the absence of any dietary intake of β-alanine, HIIT increased MCarn content. The contribution of increased MCarn to the total increase in βmin vitro appears to be small.

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

DE Salles Painelli V,Nemezio KM,Pinto AJ,Franchi M,Andrade I,Riani LA,Saunders B,Sale C,Harris RC,Gualano B,Artioli GG

doi

10.1249/MSS.0000000000001697

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

2242-2252

issue

eissn

0195-9131

issn

1530-0315

pii

00005768-201811000-00008

journal_volume

pub_type

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High-Intensity Interval Training Augments Muscle Carnosine in the Absence of Dietary Beta-alanine Intake.