Speed- and Circuit-Based High-Intensity Interval Training on Recovery Oxygen Consumption

Area of Science:

• Exercise Physiology
• Metabolic Health
• Weight Management

Background:

• The obesity epidemic necessitates effective strategies for increasing energy expenditure and promoting weight loss.
• High-intensity exercise, particularly high-intensity interval training (HIIT), is known to elevate Excess Post-Exercise Oxygen Consumption (EPOC) more than steady-state exercise.
• Limited research exists on the comparative effects of different HIIT modalities on Recovery Oxygen Consumption (ROC).

Purpose of the Study:

• To investigate the impact of circuit training (CT) and speed interval training (SIT) on ROC in both regularly exercising and sedentary populations.
• To compare the caloric expenditure and ROC between CT and SIT.
• To determine if exercise status influences the outcomes of these HIIT modalities.

Main Methods:

• Twenty-six participants were recruited and categorized into regularly exercising and sedentary groups.
• Oxygen consumption was measured during and after two HIIT sessions (CT and SIT) to estimate caloric expenditure.
• Recovery Oxygen Consumption (ROC) was analyzed to compare the effects of different HIIT modalities and exercise statuses.

Main Results:

• No significant differences in overall caloric expenditure or ROC were found between regularly exercising and sedentary individuals.
• There were no significant differences in ROC between SIT and CT.
• Speed interval training (SIT) resulted in significantly higher caloric expenditure compared to circuit training (CT), irrespective of participants' exercise status.

Conclusions:

• Individuals aiming to maximize caloric expenditure should opt for SIT over CT.
• Both SIT and CT are effective HIIT modalities for increasing post-exercise oxygen consumption, offering similar benefits for ROC.
• Exercise status does not appear to significantly alter the caloric expenditure or ROC outcomes between SIT and CT.