Cardiovascular Responses During Hypoventilation at Exercise

Abstract This study aimed to determine the cardiovascular responses during a prolonged exercise with voluntary hypoventilation (VH). 7 men performed 3 series of 5-min exercise at 65% of normoxic maximal O 2 uptake under 3 conditions: (1) normal breathing (NB) in normoxia (NB 0.21 ), (2) VH in normox...

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Bibliographic Details
Published in:International journal of sports medicine 2011-06, Vol.32 (6), p.438-445
Main Authors: Woorons, X., Bourdillon, N., Lamberto, C., Vandewalle, H., Richalet, J.-P., Mollard, P., Pichon, A.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Cardiac Output - physiology
Exercise Test
Fundamental and applied biological sciences. Psychology
Heart Rate - physiology
Humans
Hypoventilation - metabolism
Male
Oxygen - blood
Oxygen Consumption
Stroke Volume - physiology
Training & Testing
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Young Adult
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Summary:Abstract This study aimed to determine the cardiovascular responses during a prolonged exercise with voluntary hypoventilation (VH). 7 men performed 3 series of 5-min exercise at 65% of normoxic maximal O 2 uptake under 3 conditions: (1) normal breathing (NB) in normoxia (NB 0.21 ), (2) VH in normoxia (VH 0.21 ), (3) NB in hypoxia (NB 0.157 , inspired oxygen fraction=0.157). In both VH 0.21 and NB 0.157 , there was a similar drop in arterial oxygen saturation and arterial O 2 content (CaO 2 ) which were lower than in NB 0.21 . Heart rate (HR), stroke volume, and cardiac output (–) were higher in VH 0.21 than in NB 0.21 during most parts of exercise whereas there was no difference between NB 0.157 and VH 0.21 or NB 0.21 . HR variability analysis suggested an increased sympathetic modulation in VH 0.21 only. O 2 transport and oxygen uptake were generally not different between interventions. Mixed venous O 2 content (C–O 2 ) was lower in NB 0.157 than in both VH 0.21 and NB 0.21 and not different between the latter. CaO 2 –C–O 2 was not different between NB 0.157 and NB 0.21 but lower in VH 0.21 . This study shows that a prolonged exercise with VH leads to a greater cardiac activity, independent from the hypoxic effect. The greater – in VH compared to normal breathing seems to be the main factor for compensating the drop of arterial oxygen content.
ISSN:0172-4622
1439-3964
DOI:10.1055/s-0031-1271788