Rebreathing equilibration of CO2 during exercise.

Jones, N L; Rěbuck, A. S.

doi:10.1152/jappl.1973.35.4.538

Cited by 38 publications

(16 citation statements)

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“…Accurate measurements are not available at higher work intensities. Because normal subjects may increase VT up to -60% of vital capacity during exercise (97), it is probable that VT encroaches on the less-compliant upper portion of the PV curve of the lung under these extreme circumstances, account.ing for some of the increase in the work of breathing (194).…”

Section: Power Output Of Ventilatory Pumpmentioning

confidence: 99%

Breathing During Exercise

Whipp

Pardy

1986

Comprehensive Physiology

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Section: Power Output Of Ventilatory Pumpmentioning

confidence: 99%

Breathing During Exercise

Whipp

Pardy

1986

Comprehensive Physiology

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“…They performed the hyperoxic rebreathing test previously described both at rest and during exercise at 25 W and, if possible, at 50 W. A 20 min rest period was taken between tests. The carbon dioxide concentration in the bag was increased to 9-5% for the 25 W load and 11.5% for the 50 W load; since the mixedvenous carbon dioxide level increases during exercise relative to the load (Jones & Rebuck, 1973). During the exercise test, the volunteers pedalled at the required load for the initial 5 min period breathing the 50% oxygen mixture, and for the period of rebreathing.…”

Section: Exercisementioning

confidence: 99%

The effects of hypercapnia, hypoxia, exercise and anxiety on the pattern of breathing in man.

Bechbache¹,

Chow²,

Duffin³

et al. 1979

The Journal of Physiology

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SUMMARY1. The pattern of breathing, defined as the relations between tidal volume and inspiratory and expiratory times, was measured during the stimulation of breathing by carbon dioxide (hyperoxic rebreathing at rest) in twenty-seven healthy, young volunteers.2. Most of the patterns (twenty) were divisible into two parts, for low (range 1) and high (range 2) tidal volumes. The relations were curved, inverse proportionalities for both inspiration and expiration in range 2, and for expiration in range 1. The relations for inspiration in range 1 were evenly divided between those with constant inspiratory times (type 1) and those with curved, inverse proportionalities (type 2).3. In four volunteers, direct proportionalities predominated and the patterns were scattered (type 3).4. Eight of the volunteers (four type 1, two type 2 and two type 3 patterns) repeated the measurements and one changed from a type 1 to a type 3 pattern.5. Nine of the volunteers also rebreathed during resting hypoxia. Two altered their patterns, and the others had patterns which were superimposed upon those measured during hyperoxic rebreathing at rest.6. Eighteen of the volunteers also rebreathed (hyperoxic) during light exercise (25 W). Five entrained their breathing frequency to the exercise rhythm and showed exercise patterns with constant inspiratory and expiratory times. The others had patterns which were extensions of those measured during hyperoxic rebreathing at rest.7. The pattern of breathing in range 1 was measured by steady-state methods in a further ten volunteers at rest with their eyes closed and open, and during mental arithmetic. The pooled average pattern showed that the stress of mental arithmetic shortened both inspiratory and expiratory times, and changed a type 2 pattern into a type 1 pattern.

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“…28 Three submaximal workloads of 30, 45, and 60 W (corresponding to ~40, 50, and 60% of peak work rate, respectively) were assessed. Stroke volume (SV; ml) was determined as Q divided by heart rate (HR; beats/min).…”

mentioning

confidence: 99%