Eye surface infrared thermography usefulness as a noninvasive method of measuring stress response in sheep during shearing: Correlations with serum cortisol and rectal temperature values

Arfuso, Francesca; Acri, Giuseppe; Piccione, Giuseppe; Sansotta, Carlo; Fazio, Francesco; Giudice, Elisabetta; Giannetto, Claudia

doi:10.1016/j.physbeh.2022.113781

Cited by 28 publications

(30 citation statements)

References 45 publications

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“…In the literature, some contradictory results have been obtained regarding the increase or decrease in OT values in response to physical exercise. It is likely that differences in data collection methodologies between studies, such as the time of sampling, may account for these differences [ 30 ]. Infrared thermography is able to effectively measure OT changes during exercise, which may be related to stress levels in show-jumping horses during daily training [ 2 ].…”

Section: Discussionmentioning

confidence: 99%

“…Both core and surface temperature of the body can reveal how animals cope with the surrounding environmental changes. Animals’ adaptation mechanisms to changes in environmental conditions consist of the activation of the HPA axis, causing the redistribution of blood and possibly promoting dilation of the blood vessels of the periocular musculature, with a consequent increase in body temperature, which has led to its association with the body’s response following acute stress of short duration [ 30 , 32 ].…”

Section: Discussionmentioning

confidence: 99%

“…Our findings suggest that OT may be considered as an alternative tool for non-invasive central temperature measurement as an indicator of horses’ physical fitness after a day of work. The superficial areas of the eye are rich in capillary beds, innervated by the sympathetic system, thus representing an ideal place to measure local changes in blood flow as a consequence of the activation of the autonomic nervous system [ 1 , 6 , 12 , 30 , 35 , 36 ].…”

Section: Discussionmentioning

confidence: 99%

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Correlation between Ocular and Rectal Temperature with Intra Ocular Pressure in Horse during Exercise

Aragona

Pietro

Arfuso

et al. 2022

Animals

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The aim of the present study was to investigate the response to physical exercise of some ocular physiological variables (ocular temperature and intraocular pressure) in horses performing a jumping course in the morning (a.m.) or in the afternoon hours (p.m.), before and after the exercise, in correlation with the rectal temperature. Data collection was carried out on 14 clinical healthy Italian saddle horses. All horses were trained from 9:00 to 10:00 a.m. and from 19:00 to 20:00 p.m. according to a specific training program. Ocular temperature (OT), rectal temperature (RT) and intraocular pressure (IOP) were determined. Statistical analysis showed no differences between the results for the left and the right eyes. The application of two-way repeated-measures analysis of variance (ANOVA) showed a statistically significant effect of time (before vs. after) on IOP (p = 0.0001). RT and OT were statistically influenced by time of day and by experimental conditions (a.m. vs. p.m.) (p = 0.0001). Bland–Altman (B-A) testing showed an agreement between the values of RT and OT. Our results showed a correlation between increased body temperatures and IOP variations during exercise, so they can probably be considered indicators of athletic horses’ physical fitness during exercise.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Correlation between Ocular and Rectal Temperature with Intra Ocular Pressure in Horse during Exercise

Aragona

Pietro

Arfuso

et al. 2022

Animals

Self Cite

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“…Under stressful conditions, the activation of the sympathetic system and the hypothalamic-pituitary-adrenal axis (HPA) releases effector hormones such as catecholamine and glucocorticoids, respectively. Stress-induced hyperthermia, a condition triggered by the sympathetic system, consists of increasing core body temperature and the consequences on the thermoregulatory mechanism of animals ( 5 ).…”

Section: Introductionmentioning

confidence: 99%

Thermoregulation mechanisms and perspectives for validating thermal windows in pigs with hypothermia and hyperthermia: An overview

et al. 2022

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Specific anatomical characteristics make the porcine species especially sensitive to extreme temperature changes, predisposing them to pathologies and even death due to thermal stress. Interest in improving animal welfare and porcine productivity has led to the development of various lines of research that seek to understand the effect of certain environmental conditions on productivity and the impact of implementing strategies designed to mitigate adverse effects. The non-invasive infrared thermography technique is one of the tools most widely used to carry out these studies, based on detecting changes in microcirculation. However, evaluations using this tool require reliable thermal windows; this can be challenging because several factors can affect the sensitivity and specificity of the regions selected. This review discusses the thermal windows used with domestic pigs and the association of thermal changes in these regions with the thermoregulatory capacity of piglets and hogs.

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“…Thermographic imaging has been recently applied in different disciplines of biomedicine [11][12][13] as a potential diagnostic and preventive device to evaluate stress reactions. Infrared (IR) thermography has been used to detect changes in surface temperature across a range of anatomical regions, the eye being where this method fits better [14,15]. The ocular surface (OST) evaluation through IR thermography is gaining importance as a potential non-invasive method to assess the ocular surface [11,16].…”

Section: Introductionmentioning

confidence: 99%

Ocular Surface Temperature in DED under Natural Non-Controlled Blinking Conditions

Rico-del-Viejo¹,

Llorens‐Quintana

Martínez-Alberquilla³

et al. 2022

Applied Sciences

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Infrared (IR) thermography is a tool to non-invasively assess the tear film temperature. The aim was to analyze ocular surface temperature (OST) variations in dry eye disease (DED) and control eyes under natural non-controlled blinking conditions. Imaging was performed with a thermal camera (FLIR Systems Inc.) at 30 Hz framerate in 79 participants (39 DED (62.5% women, average age 48 ± 20 years) and 40 control (46.2 % women, average age 38 ± 13 years)) using non-contact IR thermography camera. Data acquisitions were performed in natural blinking conditions for 40 s. IR images were analyzed using a custom algorithm that calculates the OST indexes: mean OST, OST at the start and at the end, minimum and maximum OST, and tear evaporation rate (TER). No significant differences were found between groups in any thermal parameter analyzed (paired comparisons t-test, p > 0.05). In conclusion, the findings of this study did not reveal significant differences between DED and control eyes under natural non-controlled blinking conditions. However, the presence of clinical signs in the control group may affect the results, highlighting the role of DED diagnosis criteria.

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Eye surface infrared thermography usefulness as a noninvasive method of measuring stress response in sheep during shearing: Correlations with serum cortisol and rectal temperature values

Cited by 28 publications

References 45 publications

Correlation between Ocular and Rectal Temperature with Intra Ocular Pressure in Horse during Exercise

Correlation between Ocular and Rectal Temperature with Intra Ocular Pressure in Horse during Exercise

Thermoregulation mechanisms and perspectives for validating thermal windows in pigs with hypothermia and hyperthermia: An overview

Ocular Surface Temperature in DED under Natural Non-Controlled Blinking Conditions

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