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Ventilatory and occlusion-pressure responses to incremental-load exercise.

C M Hesser, F Lind

Respiration Physiology

|March 1, 1983

Summary

Mouth occlusion pressure (P0.1) better reflects respiratory drive during exercise than minute ventilation. As exercise intensity increases, P0.1 rises faster, compensating for increased respiratory impedance.

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Area of Science:

Exercise Physiology
Respiratory Physiology

Background:

Understanding respiratory control during exercise is crucial for assessing cardiorespiratory fitness.
Mouth occlusion pressure (P0.1) is a measure of respiratory drive, while minute ventilation (V) and flow rates reflect respiratory output.

Purpose of the Study:

To investigate the relationship between respiratory drive (P0.1) and ventilatory responses (V, flow rates) during incremental exercise.
To determine if P0.1 is a more accurate index of respiratory drive than V or flow rates at higher exercise intensities.

Main Methods:

Eight healthy subjects performed incremental cycle ergometry up to 200 W.
Mouth occlusion pressure (P0.1), minute ventilation (V), and inspiratory/expiratory flows were measured at rest and during exercise.

Main Results:

P0.1, V, and flow rates increased curvilinearly with exercise load.
The ratio of P0.1 to V and mean inspiratory flow increased with work load above 40 W.
This divergence suggests P0.1 increased disproportionately faster than ventilatory output at higher exercise levels.

Conclusions:

Increased respiratory impedance due to higher respiratory frequency and resistance likely caused the divergence between P0.1 and ventilatory responses.
An active load-compensating response enhanced respiratory drive (P0.1) with increasing work load.
P0.1 is a more representative index of respiratory drive than V or mean inspiratory flow during moderate to heavy exercise.

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