Restricted nasal-only breathing during self-selected low intensity training does not affect training intensity...

Area of Science:

• Exercise Physiology
• Respiratory Physiology

Background:

• Low-intensity endurance training often exceeds prescribed intensity, shifting towards threshold training.
• Nasal breathing restriction may mitigate this intensity drift during exercise.

Purpose of the Study:

• To investigate the physiological effects of nasal-only breathing versus oro-nasal breathing during low-intensity endurance cycling.
• To determine if nasal breathing restriction influences training intensity distribution and physiological responses.

Main Methods:

• Nineteen healthy adults completed 60-minute cycling sessions at self-selected low intensity, with and without breathing restrictions (nasal-only vs. oro-nasal).
• Continuous monitoring of heart rate, respiratory gas exchange, and power output was performed.
• Capillary blood lactate concentrations and ratings of perceived effort were assessed.

Main Results:

• Nasal-only breathing resulted in significantly lower total ventilation, carbon dioxide release, oxygen uptake, and breathing frequency.
• Lower capillary blood lactate concentrations were observed towards the end of the nasal-only breathing condition.
• Despite marginally higher discomfort, perceived effort did not differ, and intensity distribution remained similar between conditions.

Conclusions:

• Nasal-only breathing is associated with physiological adaptations that could support endurance training.
• This breathing strategy did not prevent participants from exceeding intended low-intensity training levels.
• Further longitudinal research is needed to understand long-term adaptations to altered breathing patterns during exercise.