Using minute ventilation for ambulatory estimation of additional heart rate

Area of Science:

• Physiology
• Psychophysiology
• Behavioral Science

Background:

• Physical activity and emotional states both elicit physiological activation.
• Existing methods for estimating the emotional component of heart rate (HR) rely on oxygen consumption, which may not be suitable for all stress-inducing situations.

Purpose of the Study:

• To introduce and validate a novel method for estimating the emotional component of heart rate (HR) by substituting minute ventilation (V) for oxygen consumption.
• To assess physiological responses, including HR and V, in individuals with flight phobia compared to controls during various conditions, including physical activity and simulated flight.

Main Methods:

• Developed a method to calculate additional heart rate (aHR) based on the relationship between minute ventilation (V) and HR during an exercise test.
• Physiologically monitored 28 flight phobics and 15 non-anxious controls during walking and simulated flight scenarios.
• Compared raw HR, aHR, and V between phobics and controls across different conditions.

Main Results:

• While raw HR did not significantly differ between groups, the calculated aHR was significantly higher in flight phobics when entering the plane, indicating heightened anxiety.
• Minute ventilation (V) did not differ between groups, suggesting the absence of hyperventilation in phobics.
• The novel aHR method accurately reflected increased subjective anxiety in flight phobics during physically active stress.

Conclusions:

• The developed method using minute ventilation (V) to estimate additional heart rate (aHR) is a useful tool for analyzing physiological stress responses.
• This approach is particularly effective for individuals experiencing stress during physical activity, such as those with specific phobias.
• The findings highlight the utility of psychophysiological measures in understanding anxiety responses in active individuals.