External mechanical work in the galloping racehorse

Self Davies, Z T; Spence, A J; Wilson, A M

Abstract

Horse locomotion is remarkably economical. Here, we measure external mechanical work of the galloping horse and relate it to published measurements of metabolic cost. Seven Thoroughbred horses were galloped (ridden) over force plates, under a racing surface. Twenty-six full strides of force data were recorded and used to calculate the external mechanical work of galloping. The mean sum of decrements of mechanical energy was −876 J (±280 J) per stride and increments were 2163 J (±538 J) per stride as horses were accelerating. Combination with published values for internal work and metabolic costs for galloping yields an apparent muscular efficiency of 37–46% for galloping, which would be reduced by energy storage in leg tendons. Knowledge about external work of galloping provides further insight into the mechanics of galloping from both an evolutionary and performance standpoint.

Citation

Self Davies, Z. T., Spence, A. J., & Wilson, A. M. (in press). External mechanical work in the galloping racehorse. Biology Letters, 1, https://doi.org/10.1098/rsbl.2018.0709

• Journal Article Type: Article
• Acceptance Date: Jan 29, 2019
• Deposit Date: Feb 26, 2019
• Publicly Available Date: Feb 26, 2019
• Journal: Biology Letters
• Print ISSN: 1744-9561
• Publisher: The Royal Society
• Peer Reviewed: Peer Reviewed
• Volume: 1
• DOI: https://doi.org/10.1098/rsbl.2018.0709
• Public URL: https://rvc-repository.worktribe.com/output/1383773