Influence of Exercise and Emotional Stresses on Secretion of Prolactin and Growth Hormone in Thoroughbred Horses

Overview

Journal J Equine Sci

Date 2021 Jul 5

PMID 34220271

Citations 2

Authors

Tomoki Kitaura

Fumio Sato

Testuro Hada

Mutsuki Ishimaru

Rumi Kodama

Yasuo Nambo

Gen Watanabe

Kazuyoshi Taya

Affiliations

Soon will be listed here.

Abstract

The secretion of prolactin and growth hormone in response to exercise and emotional stresses was investigated in Thoroughbreds. Two experiments were performed: one with loading of only exercise stress and one with simultaneous loading of exercise and emotional stresses. Exercise stress was loaded in 4 steps using a treadmill for horses: pre-exercise period (5 min), walking period (6.5 min), galloping period (3 min), and cooling down period (10 min). Emotional stress was loaded by showing a loud video of an audience at a racetrack during the walking period. The results clearly demonstrated that exercise stress rapidly increased the secretion of prolactin and growth hormone and that secretion of them persisted for a specific period after the exercise. In addition, emotional stress promoted prolactin secretion.

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