| Autor: |
Barahona-Fuentes G; Núcleo de Investigación en Salud, Actividad Física y Deporte, ISAFYD. Universidad de Las Américas., Huerta Ojeda Á; Núcleo de Investigación en Salud, Actividad Física y Deporte, ISAFYD. Universidad de Las Américas., Galdames Maliqueo S; Facultad de Ciencias de la Actividad Física y del Deporte, Universidad de Playa Ancha de Ciencias de la Educación, Valparaíso, Chile., Yeomans-Cabrera MM; Facultad de Educación. Universidad de Las Américas., Jorquera Aguilera C; Escuela de Nutrición y Dietética. Facultad de Ciencias. Universidad Mayor. |
| Jazyk: |
angličtina |
| Zdroj: |
Nutricion hospitalaria [Nutr Hosp] 2023 Oct 06; Vol. 40 (5), pp. 1047-1055. |
| DOI: |
10.20960/nh.04432 |
| Abstrakt: |
Introduction: Background: the use of beta-alanine (BA) to increase physical performance in the heavy-intensity domain zone (HIDZ) is widely documented. However, the effect of this amino acid on the post-exertion rating of perceived exertion (RPE), heart rate (HR), and blood lactate (BL) is still uncertain. Objectives: a) to determine the effect of acute BA supplementation on post-exertion RPE, HR, and BL in middle-distance athletes; and b) to determine the effect of acute BA supplementation on physical performance on the 6-minute race test (6-MRT). Material and methods: the study included 12 male middle-distance athletes. The de-sign was quasi-experimental, intrasubject, double-blind & crossover. It had two treat-ments (low-dose BA [30 mg·kg-1] and high-dose BA [45 mg·kg-1]) and a placebo, 72 hours apart. The effect of BA was evaluated at the end of the 6-MRT and post-exertion. The variables were RPE, HR and BL, and 6-MRT (m) distance. The statistical analysis included a repeated-measures ANOVA (p < 0.05). Results: the analysis evidenced no significant differences at the end of 6-MRT for all variables (p ˃ 0.05). However, both doses of BA generated a lower post-exertion RPE. The high dose of BA caused significant increases in post-exertion BL (p ˂ 0.05). Conclusion: acute supplementation with BA generated a lower post-exertion RPE. This decrease in RPE and the post-exertion BL increase could be related to an increase in physical performance in HIDZ. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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