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Literature DB >> 1185679

Mean and breath-by-breath pattern of breathing in man during steady-state exercise.

J D Kay, E S Petersen, H Vejby-Christensen.

Abstract

1. The breathing pattern, that is the relation between tidal volume (VT) and the inspiratory (TI) and expiratory (TE) durations, has been studied for individual breaths (forty in each steady state). 2. Five healthy subjects were studied in steady-state exercise on a bicycle ergometer breathing air; three of them were also studied in hypercapnia, at rest and during exercise, and two of them also during exercise on a treadmill. 3. Tidal volume and respiratory frequency both increased with work load. The increase in frequency was largely due to a progressive decrease in TE; TI also decreased. 4. At any constant level of respiratory drive (constant work load or chemical load) VT was positively correlated with both TI and TE in more than 95% of cases. 5. A simple model of the respiratory cycle which fits both the observed mean and breath-by-breath patterns and which involves no new assumptions is presented.

Entities: Disease Species

Mesh：

Substances：
Carbon Dioxide

Year: 1975 PMID： 1185679 PMCID： PMC1348409 DOI： 10.1113/jphysiol.1975.sp011114

Source DB: PubMed Journal: J Physiol ISSN： 0022-3751 Impact factor: 5.182

17 in total

9. The relation between tidal volume and inspiratory and expiratory times during steady-state carbon dioxide inhalation in man.

Authors: W N Gardner
Journal: J Physiol Date: 1977-11 Impact factor: 5.182

10. A quantitative description of the pattern of breathing during steady-state CO2 inhalation in man, with special emphasis on expiration.

Authors: D J Cunningham; W N Gardner
Journal: J Physiol Date: 1977-11 Impact factor: 5.182

Mean and breath-by-breath pattern of breathing in man during steady-state exercise.

1. An analysis of some short-term patterns of breathing in man at rest.

2. The correlation of intercostal muscle activity with respiratory air flow in concious human subjects.

3. Role of the diaphragm in breathing in conscious normal man: an electromyographic study.

4. Mechanical compliance and resistance of the lung-thorax calculated from the flow recorded during passive expiration.

5. Proceedings: The duration of inspiration during changing states of ventilation in man.

6. Laryngeal regulation of respiratory airflow.

7. On the regulation of depth and rate of breathing.

8. Control mechanisms determining rate and depth of respiratory movements.

9. Breath-to-breath variations of pulmonary gas exchange in resting man.

10. Studies of the pulmonary vagal control of central respiratory rhythm in the absence of breathing movements.

1. Patterns of breathing in response to alternating patterns of alveolar carbon dioxide pressures in man.

2. Role of the rapid neurogenic component and its constituents in the organization of effort hyperpnea.

3. Human hypoglossal motor unit activities in exercise.

4. The effect of lung inflation on the control of respiratory frequency in the neonate.

5. The effects of locomotor-respiratory coupling on the pattern of breathing in horses.

6. The entrainment of ventilation frequency to exercise rhythm.

7. Stride frequency and ventilation at constant carbon dioxide output.

8. Locomotor behaviours and respiratory pattern of the Mediterranean fin whale (Balaenoptera physalus).

9. The relation between tidal volume and inspiratory and expiratory times during steady-state carbon dioxide inhalation in man.

10. A quantitative description of the pattern of breathing during steady-state CO2 inhalation in man, with special emphasis on expiration.