Conventional methods to prescribe exercise intensity are ineffective for exhaustive interval training.
Arthur Henrique Bossi1,2,3, Diana Cole4, Louis Passfield5
1School of Sport and Exercise Sciences, University of Kent, Canterbury, Kent, UK. a.bossi@napier.ac.uk.
European Journal of Applied Physiology
|March 29, 2023
Summary
Common methods for prescribing high-intensity interval training (HIIT) intensity do not effectively normalize individual performance or physiological responses. These training intensity normalization methods show high variability, making it difficult to predict acute HIIT outcomes for athletes.
Area of Science:
- Exercise Physiology
- Sports Science
- Training Methodology
Background:
- High-intensity interval training (HIIT) is a popular training modality.
- Accurate intensity prescription is crucial for optimizing training adaptations.
- Individual responses to standardized training protocols can vary significantly.
Purpose of the Study:
- To evaluate the effectiveness of different relative intensity prescription methods in normalizing performance and physiological responses during HIIT.
- To quantify the inter-individual variability in acute responses to HIIT when using common prescription techniques.
Main Methods:
- Sixteen cyclists completed an incremental test, a 3-minute all-out test, and a 20-minute time-trial to establish performance benchmarks.
- Four HIIT sessions (4 min work, 2 min rest) were performed to exhaustion using distinct intensity prescription methods.
- Inter-individual variability in time to exhaustion, physiological, and perceptual responses was analyzed.
Main Results:
- High inter-individual variability was observed across all measured outcomes, including time to exhaustion.
- Confidence intervals for the dependent variables substantially overlapped between the different prescription methods.
- Coefficients of variation for time to exhaustion ranged from 44.2% to 59.1%, indicating poor predictability of acute HIIT responses.
Conclusions:
- The investigated methods for prescribing relative exercise intensity do not adequately normalize acute responses to HIIT among individuals.
- Current prescription strategies may lead to inconsistent training stress and outcomes for athletes.
- Further research is needed to develop more reliable methods for individualizing HIIT intensity.
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