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Substrate use in horses during exercise : the 'fasted' compared to the postprandial state

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Abstract
Training in the fasted state has beneficial effects on performance in the human athlete. In the horse, training in the fasted state is associated with an increased mobilization of non-esterified fatty acids (NEFA) as an energy source. This is in contrast with postprandial (grain-fed) training, during which lipolysis is suppressed. A higher NEFA availability is thought to reduce muscle glycogen depletion and muscle acidification. This could aid in delaying muscle fatigue. The equine gastrointestinal tract and roughage rich diet do not allow a real 'fasted' state. Luckily, roughage does not induce high plasma insulin peaks, and therefore does not have the same negative effects as grain feeding. Furthermore, the roughage-containing hindgut serves as a fluid and electrolyte buffer and continuously provides the liver with propionic acid, a precursor used in gluconeogenesis. In horses, unlike in human athletes, there is still a lot to discover when it comes to optimal pre-exercise feeding management throughout competition and training. However, whatever approach is chosen, high quality roughage needs to be the key ingredient of the equine diet. In sport horses with high energy demands, feeding good quality roughage may be combined with fibre rich concentrates, pelleted roughages sources or vegetal oil instead of starch rich concentrates to reach the energy requirements for intensive work. Last but not least, feeding multiple small meals throughout the day is preferred over feeding a larger meal twice a day.
Keywords
EQUINE SKELETAL-MUSCLE, FORAGE-ONLY DIET, HIGH-FAT INTAKE, APPARENT DIGESTIBILITY, GLUCOSE-UTILIZATION, ENDURANCE EXERCISE, FEEDING MANAGEMENT, INSULIN-RESISTANCE, SUPPLEMENT USE, BETA-CELLS

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Citation

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MLA
Robyn, Julie, Lukas Plancke, Berit Boshuizen, et al. “Substrate Use in Horses During Exercise : the ‘Fasted’ Compared to the Postprandial State.” VLAAMS DIERGENEESKUNDIG TIJDSCHRIFT 86.5 (2017): 275–285. Print.
APA
Robyn, Julie, Plancke, L., Boshuizen, B., De mee ûs, C., de Bruijn, M., & Delesalle, C. (2017). Substrate use in horses during exercise : the “fasted” compared to the postprandial state. VLAAMS DIERGENEESKUNDIG TIJDSCHRIFT, 86(5), 275–285.
Chicago author-date
Robyn, Julie, Lukas Plancke, Berit Boshuizen, Constance De mee ûs, Marco de Bruijn, and Catherine Delesalle. 2017. “Substrate Use in Horses During Exercise : the ‘Fasted’ Compared to the Postprandial State.” Vlaams Diergeneeskundig Tijdschrift 86 (5): 275–285.
Chicago author-date (all authors)
Robyn, Julie, Lukas Plancke, Berit Boshuizen, Constance De mee ûs, Marco de Bruijn, and Catherine Delesalle. 2017. “Substrate Use in Horses During Exercise : the ‘Fasted’ Compared to the Postprandial State.” Vlaams Diergeneeskundig Tijdschrift 86 (5): 275–285.
Vancouver
1.
Robyn J, Plancke L, Boshuizen B, De mee ûs C, de Bruijn M, Delesalle C. Substrate use in horses during exercise : the “fasted” compared to the postprandial state. VLAAMS DIERGENEESKUNDIG TIJDSCHRIFT. 2017;86(5):275–85.
IEEE
[1]
J. Robyn, L. Plancke, B. Boshuizen, C. De meeûs, M. de Bruijn, and C. Delesalle, “Substrate use in horses during exercise : the ‘fasted’ compared to the postprandial state,” VLAAMS DIERGENEESKUNDIG TIJDSCHRIFT, vol. 86, no. 5, pp. 275–285, 2017.
@article{8552088,
  abstract     = {Training in the fasted state has beneficial effects on performance in the human athlete. In the horse, training in the fasted state is associated with an increased mobilization of non-esterified fatty acids (NEFA) as an energy source. This is in contrast with postprandial (grain-fed) training, during which lipolysis is suppressed. A higher NEFA availability is thought to reduce muscle glycogen depletion and muscle acidification. This could aid in delaying muscle fatigue. The equine gastrointestinal tract and roughage rich diet do not allow a real 'fasted' state. Luckily, roughage does not induce high plasma insulin peaks, and therefore does not have the same negative effects as grain feeding. Furthermore, the roughage-containing hindgut serves as a fluid and electrolyte buffer and continuously provides the liver with propionic acid, a precursor used in gluconeogenesis. In horses, unlike in human athletes, there is still a lot to discover when it comes to optimal pre-exercise feeding management throughout competition and training. However, whatever approach is chosen, high quality roughage needs to be the key ingredient of the equine diet. In sport horses with high energy demands, feeding good quality roughage may be combined with fibre rich concentrates, pelleted roughages sources or vegetal oil instead of starch rich concentrates to reach the energy requirements for intensive work. Last but not least, feeding multiple small meals throughout the day is preferred over feeding a larger meal twice a day.},
  author       = {Robyn, Julie and Plancke, Lukas and Boshuizen, Berit and De meeûs, Constance and de Bruijn, Marco and Delesalle, Catherine},
  issn         = {0303-9021},
  journal      = {VLAAMS DIERGENEESKUNDIG TIJDSCHRIFT},
  keywords     = {EQUINE SKELETAL-MUSCLE,FORAGE-ONLY DIET,HIGH-FAT INTAKE,APPARENT DIGESTIBILITY,GLUCOSE-UTILIZATION,ENDURANCE EXERCISE,FEEDING MANAGEMENT,INSULIN-RESISTANCE,SUPPLEMENT USE,BETA-CELLS},
  language     = {eng},
  number       = {5},
  pages        = {275--285},
  title        = {Substrate use in horses during exercise : the 'fasted' compared to the postprandial state},
  volume       = {86},
  year         = {2017},
}

Web of Science
Times cited: