Resisted and Endurance High Intensity Interval Training for Combat Preparedness.

Area of Science:

• Exercise Physiology
• Military Science
• Sports Medicine

Background:

• High-intensity interval training (HIIT) models are increasingly recognized for superior athletic performance gains compared to traditional methods.
• Soldier populations may particularly benefit from HIIT, with studies suggesting enhanced physical improvements.
• This research investigates the psychophysiological effects of two distinct HIIT protocols in soldiers.

Purpose of the Study:

• To analyze the psychophysiological response of soldiers undergoing resisted high-intensity interval training (RHIIT) and endurance high-intensity interval training (EHIIT).
• To determine which HIIT protocol most closely replicates the psychophysiological demands experienced in operational combat environments.
• To compare the effectiveness of RHIIT and EHIIT in eliciting specific physiological and psychological stress markers.

Main Methods:

• Twenty-one professional soldiers from the Spanish Army participated in the study.
• HIIT protocols were designed to simulate actual military scenarios, including high ambient temperatures (36-38°C).
• Psychophysiological responses were measured, including blood lactate, perceived exertion, heart rate, strength, and cortical arousal.

Main Results:

• Both RHIIT and EHIIT significantly increased blood lactate, perceived exertion, heart rate, and lower limb explosive strength.
• Significant decreases in skin temperature and body weight were observed in both groups.
• Endurance high-intensity interval training (EHIIT) uniquely elevated cortical arousal and isometric hand-grip strength, aligning with combat stress responses.

Conclusions:

• Both RHIIT and EHIIT protocols induce significant psychophysiological stress in soldiers.
• EHIIT demonstrates a greater psychophysiological similarity to actual combat situations than RHIIT.
• Findings suggest EHIIT may be a more suitable training modality for preparing soldiers for operational demands.