No effect of skin temperature on human ventilation response to hypercapnia during light exercise with a normothermic core temperature |
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| Authors: | Jesse G Greiner Miriam E Clegg Michael L Walsh Matthew D White |
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| Institution: | (1) Laboratory for Exercise and Environmental Physiology, Department of Biomedical Physiology and Kinesiology, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada; |
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| Abstract: | Hyperthermia potentiates the influence of CO2 on pulmonary ventilation (
(V)\dot]\textE \dot{V}_{\text{E}} ). It remains to be resolved how skin and core temperatures contribute to the elevated exercise ventilation response to CO2. This study was conducted to assess the influences of mean skin temperature (
`(T)]\textSK \overline{T}_{\text{SK}} ) and end-tidal PCO2 (PETCO2) on
(V)\dot]\textE \dot{V}_{\text{E}} during submaximal exercise with a normothermic esophageal temperature (T
ES). Five males and three females who were 1.76 ± 0.11 m tall (mean ± SD), 75.8 ± 15.6 kg in weight and 22.0 ± 2.2 years of
age performed three 1 h exercise trials in a climatic chamber with the relative humidity (RH) held at 31.5 ± 9.5% and the
ambient temperature (T
AMB) maintained at one of 25, 30, or 35°C. In each trial, the volunteer breathed eucapnic air for 5 min during a rest period
and subsequently cycle ergometer exercised at 50 W until T
ES stabilized at ~37.1 ± 0.4°C. Once T
ES stabilized in each trial, the volunteer breathed hypercapnic air twice for ~5 min with PETCO2 elevated by approximately +4 or +7.5 mmHg. The significantly (P < 0.05) different increases of PETCO2 of +4.20 ± 0.49 and +7.40 ± 0.51 mmHg gave proportionately larger increases in
(V)\dot]\textE \dot{V}_{\text{E}} of 10.9 ± 3.6 and 15.2 ± 3.6 L min−1 (P = 0.001). This hypercapnia-induced hyperventilation was uninfluenced by varying the
`(T)]\textSK \overline{T}_{\text{SK}} to three significantly different levels (P < 0.001) of 33.2 ± 1.2°C, to 34.5 ± 0.8°C to 36.4 ± 0.5°C. In conclusion, the results support that skin temperature between
~33 and ~36°C has neither effect on pulmonary ventilation nor on hypercapnia-induced hyperventilation during a light exercise
with a normothermic core temperature. |
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