Contribution à l'estimation de la dépense énergétique liée à l'exercice chez le cheval trotteur attelé : utilisation des mesures de consommation d'oxygène et de fréquence cardiaque en conditions de terrain

Abstract : Physical activity, commonly expressed as a multiple of basal metabolic requirements, induces an additional energy cost which varied with exercises and their characteristics. The objective of the present work was to estimate energy expenditure related to training exercises in the harnessed Standardbred trotters. Oxygen consumption (VO2) and heart rate (HR) were measured in field conditions in trotters maintained under controlled situation using a portable device measuring respiratory gas exchanges, the equine K4b² and the Equimask. Trotters were submitted to four exercises used in the trotter training: ‘promenade’, ‘jogging’, ‘parcours’ and ‘interval’. Preliminary to the quantification of the exercise energy expenditure, some methodological adaptations were needed. Our results showed that the use of portable analyzers provides consistent cardiorespiratory data even at high running speeds (12 m/s) and thus a good estimation of the exercise energy expenditure. However for practical application in the field, our results suggest that heart rate can be used to estimate VO2, particularly when individual VO2/HR curve was established previously. Our results confirm the interest of the investigation of the exercise energy expenditure which is directly related to the intensity, duration and type of exercise performed. Indeed, we proposed coefficients to increase total energy expenditure due to the exercise in multiple to the energy basal metabolism. Coefficients correspond to 1.26 - 1.23 to 1.39 and 1.39 times the maintenance requirements for ‘promenade’, ‘jogging’, ‘parcours’ and ‘interval’ exercises. A typical training week in trained trotter requires an increase of the energy 1.30 times maintenance requirements. Although this estimate needs to be completed by adding anaerobic contribution to the energy supply but also all additional physical activities performed by trained trotters, our work provides new evidence to quantify energy expenditure related to specific exercises in harnessed Standardbred trotter.
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Justine Fortier. Contribution à l'estimation de la dépense énergétique liée à l'exercice chez le cheval trotteur attelé : utilisation des mesures de consommation d'oxygène et de fréquence cardiaque en conditions de terrain. Biologie animale. Université de Bourgogne, 2014. Français. ⟨NNT : 2014DIJOS056⟩. ⟨tel-01141974⟩

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