Muscular tension as an indicator of acute stress in horses.

Autor: Rankins EM; Equine Science Center, Department of Animal Science, Rutgers The State University of New Jersey, New Brunswick, New Jersey, USA., Manso Filho HC; Departamento de Zootecnia, Universidade Federal Rural de Pernambuco (UFRPE), Recife-PE, Brasil., Malinowski K; Equine Science Center, Department of Animal Science, Rutgers The State University of New Jersey, New Brunswick, New Jersey, USA., McKeever KH; Equine Science Center, Department of Animal Science, Rutgers The State University of New Jersey, New Brunswick, New Jersey, USA.
Jazyk: angličtina
Zdroj: Physiological reports [Physiol Rep] 2022 Mar; Vol. 10 (6), pp. e15220.
DOI: 10.14814/phy2.15220
Abstrakt: Horses' muscular tension during acute stress remains unexplored. Our aim was to assess muscular, behavioral, cortisol, and hematocrit responses to social isolation (ISO), novel object exposure (NOV), and sham clipping (CLIP). Altered stress responses were expected. Eight mature Standardbred horses (four mares and four geldings) were exposed to acute stressors and a control period (CON) in a balanced, replicated 4×4 Latin Square experimental design with 3 min treatment periods and 10 min washout periods. Surface electromyography collected from the masseter, brachiocephalas, cervical trapezius, and longissimus dorsi was processed to derive average rectified value (ARV) and median frequency (MF) during the initial, middle, and final 30 s of treatments. ARV and MF data were log transformed then analyzed using a mixed model, repeated measures ANOVA along with plasma cortisol and hematocrit. Behavior data were analyzed using a negative binomial distribution mixed model ANOVA. CLIP resulted in greater (p < 0.05) log ARV in the masseter (1.5 + 1.5%, mean + SD) and brachiocepahlas (2.2 + 2.0%) than CON (-1.2 + 1.4%, 0.1 + 1.5%). ISO resulted in greater (p < 0.05) log ARV in the masseter (0.2 + 1.3%) and cervical trapezius (0.6 + 1.3%) than CON (-1.2 + 1.4%, -1.0 + 1.7%). ISO increased (p < 0.05) the total number of stress-related behaviors and hematocrit. No changes in cortisol were observed. We suggest that muscular tension can be used as an indicator of acute stress in horses. Incorporating muscle activity into an array of measurements may provide a more nuanced understanding of stress responses.
(© 2022 The Authors. Physiological Reports published by Wiley Periodicals LLC on behalf of The Physiological Society and the American Physiological Society.)
Databáze: MEDLINE
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