Metabolic and ventilatory responses during very low level exercise

S. A. Goldstein, C. Weissman, J. Askanazi, Michael Rothkopf, J. Milic-Emili, J. M. Kinney

Research output: Contribution to journalArticle

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Abstract

1. Nine male and six female healthy subjects were studied during supine bicycle exercise at workloads of 12 and 37 W; pedalling rates varied between 30 and 50 cycles/min at each workload. Measurements were made of oxygen consumption (V̇O2), carbon dioxide production (V̇CO2), minute ventilation (V̇(E)), tidal volume (V(T)), respiratory frequency (f(R)), inspiratory and expiratory time (T(I),T(E) and mean inspiratory flow (V(T)/T(I) using a non-invasive canopy-computer-spirometer system. 2. At rest, males and greater values of V̇(E), V(T), T(I), inspiratory duct cycle (T(I)/T(TOT)), V̇CO2 and V̇O2, and a lower f(R), than females. 3. At the lower workload, V̇O2, V̇CO2, V̇(E), V(T) and V(T)/T(I) increased linearly with increasing pedalling rate, whereas at the higher workload there was a decrease in V̇O2 and little or no change in ventilatory parameters from 30 to 50 cycles/min except for an increase in f(R) in females. 4. While performing supine exercise, there was an effect of pedalling rate on ventilatory and metabolic parameters at the low workload (12 W) which diminished at the higher workload (37 W). An increase in pedalling rate appears to enhance efficiency at these low workloads. 5. Differences between the sexes during exercise generally include: (a) a higher breathing frequency, (b) a greater mechanical efficiency, and (c) lower ventilatory equivalents of O2 and CO2 (V̇(E)/V̇O2 and V̇(E)/V̇CO2) during the higher workload in females than males.

Original languageEnglish (US)
Pages (from-to)417-424
Number of pages8
JournalClinical Science
Volume73
Issue number4
DOIs
StatePublished - Jan 1 1987

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Workload
Exercise
Foot
Tidal Volume
Computer Systems
Carbon Dioxide
Oxygen Consumption
Sex Characteristics
Ventilation
Healthy Volunteers
Respiration

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Goldstein, S. A., Weissman, C., Askanazi, J., Rothkopf, M., Milic-Emili, J., & Kinney, J. M. (1987). Metabolic and ventilatory responses during very low level exercise. Clinical Science, 73(4), 417-424. https://doi.org/10.1042/cs0730417
Goldstein, S. A. ; Weissman, C. ; Askanazi, J. ; Rothkopf, Michael ; Milic-Emili, J. ; Kinney, J. M. / Metabolic and ventilatory responses during very low level exercise. In: Clinical Science. 1987 ; Vol. 73, No. 4. pp. 417-424.
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Goldstein, SA, Weissman, C, Askanazi, J, Rothkopf, M, Milic-Emili, J & Kinney, JM 1987, 'Metabolic and ventilatory responses during very low level exercise', Clinical Science, vol. 73, no. 4, pp. 417-424. https://doi.org/10.1042/cs0730417

Metabolic and ventilatory responses during very low level exercise. / Goldstein, S. A.; Weissman, C.; Askanazi, J.; Rothkopf, Michael; Milic-Emili, J.; Kinney, J. M.

In: Clinical Science, Vol. 73, No. 4, 01.01.1987, p. 417-424.

Research output: Contribution to journalArticle

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Goldstein SA, Weissman C, Askanazi J, Rothkopf M, Milic-Emili J, Kinney JM. Metabolic and ventilatory responses during very low level exercise. Clinical Science. 1987 Jan 1;73(4):417-424. https://doi.org/10.1042/cs0730417