Physiological comparison of intensity-controlled, isocaloric intermittent and continuous exercise
Adrien Combes1, Jeanne Dekerle2, Valérie Bougault1
1a Unité de Recherche Pluridisciplinaire Sport Santé Société - EA 7369 - URePSSS, Univ. Lille, Univ. Artois, Univ. Littoral Côte d'Opale , Lille , France.
European Journal of Sport Science
|July 6, 2018
Summary
Interval training induces greater metabolic fluctuations and may enhance mitochondrial adaptations compared to continuous exercise, despite similar intensity and energy expenditure. This suggests intermittent exercise could be more effective for long-term physiological changes.
Area of Science:
- Exercise Physiology
- Sports Science
- Metabolic Adaptations
Background:
- VO2 fluctuations are critical for chronic adaptations following interval training.
- Understanding exercise modality effects on physiological responses is key to optimizing training.
- Continuous (CON) vs. intermittent (INT) exercise impacts differ despite similar intensity.
Purpose of the Study:
- To compare the effects of continuous vs. intermittent exercise on electrical muscular activity, muscular oxygenation, and whole-body oxygen uptake.
- To investigate the physiological differences between CON and INT exercise at the same intensity and energy expenditure.
Main Methods:
- Twelve participants performed incremental tests and two randomized isocaloric exercises (30 min CON vs. 30x1 min INT with 1 min rest).
- Measurements included electromyography (EMG), oxygenation (NIRS), oxygen uptake (VO2), and blood lactate.
- Analysis focused on vastus lateralis EMG, metabolic fluctuation indices, and time spent above 90% VO2peak.
Main Results:
- Intermittent exercise showed higher metabolic fluctuations (Oxygen Fluctuation Index, HHb Fluctuation Index).
- Continuous exercise resulted in higher post-exercise blood lactate and greater time spent above 90% VO2 target.
- EMG changes were observed only in the vastus lateralis during continuous exercise.
Conclusions:
- Intermittent and continuous exercise elicit distinct physiological responses, even at similar intensity and energy expenditure.
- Intermittent exercise may recruit more fast-twitch fibers, potentially enhancing mitochondrial adaptations.
- Greater metabolic variations during intermittent exercise could stimulate mitochondrial development.
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