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The Effects of β-Alanine Supplementation on Muscle pH and the Power-Duration Relationship during High-Intensity Exercise
- Source :
- Frontiers in Physiology, Vol 9 (2018), Frontiers in Physiology
- Publication Year :
- 2018
- Publisher :
- Frontiers Media SA, 2018.
-
Abstract
- Purpose: To investigate the influence of β-alanine (BA) supplementation on muscle carnosine content, muscle pH and the power-duration relationship (i.e., critical power and W′).Methods: In a double-blind, randomized, placebo-controlled study, 20 recreationally-active males (22 ± 3 y, V°O2peak 3.73 ± 0.44 L·min−1) ingested either BA (6.4 g/d for 28 d) or placebo (PL) (6.4 g/d) for 28 d. Subjects completed an incremental test and two 3-min all-out tests separated by 1-min on a cycle ergometer pre- and post-supplementation. Muscle pH was assessed using 31P-magnetic resonance spectroscopy (MRS) during incremental (INC KEE) and intermittent knee-extension exercise (INT KEE). Muscle carnosine content was determined using 1H-MRS.Results: There were no differences in the change in muscle carnosine content from pre- to post-intervention (PL: 1 ± 16% vs. BA: −4 ± 25%) or in muscle pH during INC KEE or INT KEE (P > 0.05) between PL and BA, but blood pH (PL: −0.06 ± 0.10 vs. BA: 0.09 ± 0.13) during the incremental test was elevated post-supplementation in the BA group only (P < 0.05). The changes from pre- to post-supplementation in critical power (PL: −8 ± 18 W vs. BA: −6 ± 17 W) and W′ (PL: 1.8 ± 3.3 kJ vs. BA: 1.5 ± 1.7 kJ) were not different between groups. No relationships were detected between muscle carnosine content and indices of exercise performance.Conclusions: BA supplementation had no significant effect on muscle carnosine content and no influence on intramuscular pH during incremental or high-intensity intermittent knee-extension exercise. The small increase in blood pH following BA supplementation was not sufficient to significantly alter the power-duration relationship or exercise performance.
- Subjects :
- 0301 basic medicine
medicine.medical_specialty
muscle pH
Physiology
Carnosine
beta-Alanine
power-duration relationship
Muscle carnosine
lcsh:Physiology
03 medical and health sciences
chemistry.chemical_compound
0302 clinical medicine
Internal medicine
Physiology (medical)
Exercise performance
medicine
beta-alanine
Original Research
Alanine
lcsh:QP1-981
High intensity
INT
030229 sport sciences
carnosine
030104 developmental biology
Endocrinology
chemistry
Critical power
critical power
Subjects
Details
- Language :
- English
- ISSN :
- 1664042X
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Frontiers in Physiology
- Accession number :
- edsair.doi.dedup.....28292ec188b2f91e581a04e9512a2178
- Full Text :
- https://doi.org/10.3389/fphys.2018.00111