Evaluation of High-Intensity Interval Training and Beta-Alanine Supplementation on Efficiency of Electrical Activity and Electromyographic Fatigue Threshold

Ashley A. Herda; Abbie E. Smith; Kristina L. Kendall; Joel T. Cramer; Jeffrey R. Stout

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Evaluation of High-Intensity Interval Training and Beta-Alanine Supplementation on Efficiency of Electrical Activity and Electromyographic Fatigue Threshold

Herda, Ashley A. ^[3] ; Smith-Ryan, Abbie E. ^[4] ; Kendall, Kristina L. ^[1] ; Cramer, Joel T. ^[5] ; Stout, Jeffrey R. ^[2]
1. [1] Edith Cowan University
  
  Edith Cowan University
  
  Australia
2. [2] University of Central Florida
  
  University of Central Florida
  
  Estados Unidos
3. [3] University of Kansas-Edwards Campus
4. [4] University of North Carolina-Chapel Hill
5. [5] University of Texas-El Paso
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Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 35, Nº. 6, 2021, págs. 1535-1541
Idioma: inglés
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Resumen
- The purpose of this study was to determine the effects of high-intensity interval training (HIIT) with or without [beta]-alanine (BA) supplementation on the electromyographic fatigue threshold (EMGFT) and efficiency of electrical activity (EEA) in young women. Forty-four women (mean +/- SD; age [yrs]: 21.7 +/- 3.7; height [cm]: 166.3 +/- 6.4; body mass [kg]: 66.1 +/- 10.3) were randomly assigned to one of 3 treatment groups. The supplement groups performed HIIT on the cycle ergometer 3 times[middle dot]wk-1 for 6 weeks. Electromyographic fatigue threshold and EEA were assessed at baseline (PRE), after 3 weeks of training (MID), and after 6 weeks of HIIT (POST). Two 2-way mixed factorial analyses of variance (time [PRE vs. MID vs. POST] x treatment (BA vs. PL vs. CON)] were used to analyze EMGFT and EEA with a predetermined level of significance [alpha] of 0.05. For EMGFT, there was no interaction (p = 0.26) and no main effect for time (p = 0.28) nor treatment (p = 0.86); thus, there were no changes in EMGFT regardless of training or supplementation status. For EEA, there was no interaction (p = 0.70) nor treatment (p = 0.79); however, there was a main effect for time (p < 0.01). Our findings indicated that neither training nor supplementation was effective in improving EMGFT in women. Efficiency of electrical activity was altered, potentially because of a learning effect. Coaches and practitioners may not use these tests to monitor training status; however, they may find EEA as a useful tool to track cycling efficiency.