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Comparison of ventilation during exercise in horses wearing half- and full-face masks

Published online by Cambridge University Press:  09 March 2007

D.J. Marlin ,
V. Adams ,
A. Greenwood ,
E. Case ,
M. Roberts  and
C.M. Deaton
D.J. Marlin*
Affiliation:
Equine Centre, Faculty of Medical and Veterinary Sciences, University of Bristol, Langford, UK
V. Adams
Affiliation:
Preventive Medicine, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk CB8 7UU, UK
A. Greenwood
Affiliation:
Writtle College, Lordship Lane, Writtle, Essex, UK
E. Case
Affiliation:
Writtle College, Lordship Lane, Writtle, Essex, UK
M. Roberts
Affiliation:
Writtle College, Lordship Lane, Writtle, Essex, UK
C.M. Deaton
Affiliation:
Equine Centre, Faculty of Medical and Veterinary Sciences, University of Bristol, Langford, UK
*
*Corresponding author: [email protected]
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Abstract

Several studies have shown that the placement of a face mask on a horse can have effects on ventilation, gas exchange and the cardiovascular system during exercise. The aim of the present study was to determine if airflow and ventilation measured with the same ultrasonic flowmeters were different during exercise between horses wearing half- (HM) and full-face (FM) masks. Five clinically healthy Thoroughbred horses with no history of respiratory disease were studied in an unbalanced crossover design. They were exercised on a treadmill at speeds between 1.7 and 11ms−1 on a 3° incline wearing both masks. The following variables were recorded: peak inspired (PIF) and peak expired flow rates (PEF), inspiratory tidal volume (VT), respiratory rate (fR ), inspiratory minute ventilation (VE), inspiratory time, (TI), expiratory time (TE ), total breath time (TT), end tidal oxygen (ETO2), end tidal carbon dioxide (ETCO2) and heart rate (HR). A mask by speed of exercise interaction term was not significant for any of the models. The PEF (mean difference 12.91s−1; lower and upper 95% CI 7.6 and 18.21s−1, respectively; P<0.0001) and ETO2 (mean difference 0.77%; lower and upper 95% CI 0.48 and 1.00%, respectively; P<0.0001) were significantly greater and ETCO2 was significantly lower (mean difference −1.3%; lower and upper 95% CI −2.0 and 0.7%, respectively; P<0.0001) with the FM compared with the HM. There was also a trend for inspired VE to be higher with the FM compared with the HM (mean difference 1021min−1; lower and upper 95% CI 26 and 1781 min−1, respectively; non-significant). We conclude that the HM may impair ventilation in the horse during exercise compared with the FM, despite the latter having a greater deadspace.

Keywords

treadmillThoroughbredflowmetersultrasonicmask design
Type
Research Article
Information
Equine and Comparative Exercise Physiology , Volume 3 , Issue 3 , August 2006 , pp. 131 - 136
Copyright
Copyright © Cambridge University Press 2006

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