Hajime Ohmura

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OBJECTIVE To determine the frequency of epistaxis during or after racing among racehorses and identify factors associated with development of epistaxis. DESIGN Retrospective study. SAMPLE POPULATION 247,564 Thoroughbred and 4,045 Anglo-Arab race starts. PROCEDURE Race start information (breed, age, sex, racing distance, and race type) was obtained for(More)
OBJECTIVE To determine the effects of initial handling and training on autonomic nervous functions in young Thoroughbreds. ANIMALS 63 healthy Thoroughbreds. PROCEDURE All horses were trained to be handled and initially ridden in September of the yearling year and then trained until the following April by conventional training regimens. To obtain the(More)
OBJECTIVE To determine whether evaluation of heart rate (HR) and HR variability (HRV) during prolonged road transportation in horses provides a sensitive index of autonomic stimulation. ANIMALS Five 2-year-old Thoroughbreds. PROCEDURE ECGs were recorded as horses were transported for 21 hours in a 9-horse van. Heart rate, high-frequency (HF) power,(More)
Yearling horses are typically trained for more than a year before they begin racing; therefore, we questioned how relevant analyses of the initial responses to training are compared to physiological responses that occur over a year of training, and whether young horses with no history of training would respond the same as older horses that had been trained(More)
OBJECTIVE To determine the effects of immersion in warm springwater (38 degrees to 40 degrees C) on autonomic nervous activity in horses. ANIMALS 10 male Thoroughbreds. PROCEDURE Electrocardiograms were recorded from horses for 15 minutes during a warm springwater bath after being recorded for 15 minutes during stall rest. Variations in heart rate (HR)(More)
To investigate the effects of repeated atropine injection on heart rate (HR) variability in resting Thoroughbred horses, two microg/ kg of atropine as parasympathetic nervous blockade was injected intravenously every 6 min to a total of 8 microg/kg after intravenous administration of 0.2 mg/kg of propranolol as sympathetic nervous blockade. We recorded(More)
The present study aimed to clarify changes of oxidative stress and antioxidative functions in treadmill-exercised Thoroughbred horses (n=5, 3 to 7 years old), using recently developed techniques for measurement of serum d-ROMs for oxidative stress, and BAP for antioxidative markers. Also, the effect of nasogastric administration of hydrogen-rich water (HW)(More)
REASONS FOR PERFORMING STUDY Although the main cause of injury to the superficial digital flexor tendon (SDFT) is assumed to be high intensity loading of the tendon, to date the forces exerted on the SDFT during cantering have never been measured. OBJECTIVE To measure the force exerted on the SDFT at walk, trot and canter on a treadmill. METHODS(More)
Hypoxic training is believed to increase endurance capacity in association with hypoxia inducible factor-1α (HIF-1α), a modulator of vascular endothelial growth factor-A (VEGF-A), and to influence activation of satellite cells (SCs). However, the effect of hypoxic training on SC activation and its relation to angiogenesis has not been thoroughly(More)
OBJECTIVE To determine whether withholding of food affects autonomic nervous system balance by analysis of heart rate (HR), HR variability (HRV), and frequency of second-degree atrioventricular block in horses. ANIMALS 5 healthy Thoroughbreds. PROCEDURES For two 24-hour periods in a crossover study, food was withheld from horses or horses were(More)