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Increased body fat content in horses alters metabolic and physiological exercise response, decreases performance, and increases locomotion asymmetry

Jansson, Anna and Gunnarsson, Vikingur Th and Ringmark, Sara and Ragnarsson, Sveinn and Söderroos, Denise and Asgeirsson, Einar and Jóhannsdòttir, Tanja and Liedberg, Charlotta and Stefánsdóttir, Gudrún (2021). Increased body fat content in horses alters metabolic and physiological exercise response, decreases performance, and increases locomotion asymmetry. Physiological Reports. 9 , e14824
[Research article]

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Abstract

This study examined the effect of altered body weight (BW) and body fat content on exercise performance and recovery. Nine horses were divided into two groups, and changes in BW and fat content were induced by feeding a high (HA) or restricted (RA) energy allowance for 36 days in a cross-over design. In the last week of each treatment, BW and body condition score (BCS) were recorded, body fat percentage was estimated using ultrasound, and a standardized incremental treadmill exercise test (SET) and competition-like field test were performed (scored by judges blinded to treatments). Blood samples were collected, and heart rate (HR), rectal temperature (RT), and respiratory rate (RR) were also recorded. Objective locomotion analyses were performed before and after the field test. Body weight, body fat percentage, and BCS were higher (5-8%) in HA than in RA horses (p < 0.05). In SET, HA horses showed higher HR, plasma lactate concentration, RR, and RT than RA horses (p < 0.05), and lower VLa4, hematocrit (Hct), plasma glucose, and plasma NEFA concentrations (p < 0.05). Hct was also lower in HA horses in the field test, while RA horses showed higher scores (p < 0.05). After both tests, resting plasma lactate concentrations were reached faster in RA than in HA horses (p < 0.05). Objective locomotion asymmetry was higher in HA than in RA (p < 0.05). These results clearly show that increased BW and body fat content in horses lower physiological fitness in terms of VLa4, plasma lactate removal, Hct levels, plasma glucose availability and reduce true performance evaluated by blinded judges.

Authors/Creators:Jansson, Anna and Gunnarsson, Vikingur Th and Ringmark, Sara and Ragnarsson, Sveinn and Söderroos, Denise and Asgeirsson, Einar and Jóhannsdòttir, Tanja and Liedberg, Charlotta and Stefánsdóttir, Gudrún
Title:Increased body fat content in horses alters metabolic and physiological exercise response, decreases performance, and increases locomotion asymmetry
Series Name/Journal:Physiological Reports
Year of publishing :2021
Volume:9
Article number:e14824
Number of Pages:12
ISSN:2051-817X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Medical Bioscience
Keywords:body fat, hematocrit, lactate threshold, locomotion symmetry, performance
URN:NBN:urn:nbn:se:slu:epsilon-p-112775
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112775
Additional ID:
Type of IDID
DOI10.14814/phy2.14824
Web of Science (WoS)000661525400006
ID Code:24865
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Anatomy, Physiology and Biochemistry
Deposited By: SLUpub Connector
Deposited On:16 Jul 2021 00:25
Metadata Last Modified:16 Jul 2021 05:01

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