Abstract
The aim of this study was to analyze metabolic responses, energy expenditure per systems (EE, %) and total energy expenditure (TEE, kcal) after an acute session of continuous endurance training (ET) and high-intensity interval training (HIIT). Eleven healthy young men (21 ± 3 years; BMI: 21 ± 3 kg.m-2), performed three experimental sessions in random order: ET (40 min at 70% of heart rate reserve - HRR), HIIT (40 min, 5 min of warm-up + 5 sets of 4 min at 90% HRR, with 3 min at 50% HRR); and control session (CO, 40 min sitting at rest). Venous blood samples were collected Pre and Post each experimental session to through metabolomics (H1 NMR spectroscopy); and blood from the distal surface of the finger Pre and Post 1, 3, 5 e 7 min of each session to analyse energic systems and energy expenditure (EE) through the GEDAE-LaB software. Discriminant metabolites of metabolic responses between each session were identified using specifics softwares. ET and HIIT presented similarly higher TEE compared to CO (P < 0.01), however, ET presented higher relative contribution of aerobic metabolism compared to HIIT (P < 0.01), while HIIT presented higher relative contribution of anaerobic lactic. These findings demonstrate the role of manipulating exercise intensity and alter the relative contribution of metabolism to produce energy (e.g.: increase anaerobic lactic metabolism during HIIT and aerobic metabolism during ET) to increase the overall metabolic response after work exercise.
Highlights
Continuous endurance training (ET) has been reported as a strategy for health maintenance
ET and high-intensity interval training (HIIT) presented higher TEE compared to CO (P
Selected metabolites from VIP score (>1) were: alanine, methylsuccinate, guanidoacetate, lactate, 3-hydroxybutyrate, pyruvate, methanol, succinate, propylene glycol, hypoxanthine, O-acetylcarnitine, glycerol. These findings demonstrate the role of manipulating exercise intensity and alter the relative contribution of metabolism to produce energy to increase the overall metabolic response after matched energy expenditure and work exercise
Summary
Continuous ET has been reported as a strategy for health maintenance. Recent studies have suggested HIIT (repeated high intense bouts vs periods of recovery at low intensity) as an alternative method to produce cardiorespiratory fitness gains comparable or superior to ET exposure. ENERGETIC AND METABOLIC RESPONSES AFTER ACUTE SESSIONS OF CONTINUOUS ENDURANCE TRAINING AND HIGH-INTENSITY INTERVAL TRAINING Abstract The aim of this study was to analyze metabolic responses, energy expenditure per systems (EE, %) and total energy expenditure (TEE, kcal) after an acute session of continuous endurance training (ET) and high-intensity interval training (HIIT).
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