Ventilatory responses to exercise and carbon dioxide in elderly and younger humans |
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Authors: | A K McConnell E S G Semple C T M Davies |
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Institution: | (1) Department of Human Sciences, Loughborough University of Technology, LE11 3TU Loughborough, Leicestershire, England;(2) School of Sport and Exercise Sciences, University of Birmingham, P.O. Box 363, B15 2TT Birmingham, England |
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Abstract: | Summary The present investigation examined the relationship between CO2 sensitivity at rest (S
R) and during exercise (S
E)] and the ventilatory response to exercise in ten elderly (61–79 years) and ten younger (17–26 years) subjects. The gradient of the relationship between minute ventilation and CO2 production (
E/
CO2) of the elderly subjects was greater than that of the younger subjects mean (SEM); 32.8 (1.6) vs 27.3 (0.4); P<0.01]. At rest, S
R was lower for the elderly than for the younger group 10.77 (1.72) vs 16.95 (2.13) 1 · min–1 · kPa–1; 1.44 (0.23) vs 2.26 (0.28) 1 · min–1 · mmHg–1; P<0.05], but S
E was not significantly different between the two groups 17.85 (2.49) vs 19.17 (1.62) l · min–1 · kPa–1; 2.38 (0.33) vs 2.56 (0.21) 1 · min–1 · mmHg–1]. There were significant correlations between both S
R and S
E, and
E/
CO2 (P<0.05; P<0.001) for the younger group, bot none for the elderly. The absence of a correlation for the elderly supports the suggestion that
E/
CO2 is not an appropriate index of the ventilatory response to exercise for elderly humans. |
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Keywords: | Ageing Carbon dioxide Exercise Hypercapnia Ventilatory |
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