Differences in head accelerations and physiological demand between live and simulated professional horse racing

The purpose of this study was to determine if there are differences in mechanical and physiological demand between live and simulated racing. Fifteen male professional jockeys (31.8±9.5 years, 160.78±7.62 cm, 51.2±1.5 kg) were instrumented with inertial measurement units (IMUs) placed on their helmets to measure mechanical stress and a heart rate (HR) monitor. Head accelerations and HR were measured during a live race (between 5.5 and 6.5 furlongs) and a simulated race (equivalent of 6.5 furlongs or 1.5 min) on a race horse simulator. Paired t-tests were used to determine if there were differences between the two racing conditions for each dependent variable. Alpha level was set at P<0.05. Average HR and peak HR were significantly higher during live than simulated racing. The peak resultant linear acceleration, the average resultant linear acceleration, and the peak resultant rotational velocity were significantly higher in live racing than simulated racing. There were no significant differences in average resultant rotational velocity. Simulated racing trials had consistently lower values of head accelerations compared to live racing trials. These results may provide justification for the use of a race horse simulator as a tool capable of use in rehabilitating and returning jockeys to ride following injury as the accelerations and velocities measured on simulated racing trials were lower, suggesting a safer sports-specific exercise, while still approaching the physiological demands of live racing.

PERBANDINGAN NILAI BIOLOGIS PAKAN LOKAL DAN IMPOR PADA ANAK KUDA PACU INDONESIA

ABSTRACT COMPARISON OF BIOLOGICAL VALUE OF LOCAL AND IMPORT FEED IN INDONESIAN CHILD RACE HORSE. This research aims to determine the livestock child race horse's ability to digest feed, both local and imported feed. Digestibility of nutrients is a factor that determines the quality of feed ingredients or feed consumed by the livestock horses. This research used Statistics t-test method.Techniques of data retrieval are interviews and direct observations at sites of breeding racehorses. Data collected ie the type of local feed (corn, rice bran, fish meal, soybean, mung beans, coconut cake) and the types of imported feed (sustaina). The amount of feed (forage and concentrates) were given to livestock of child racehorse obtain the amount of feces (g / head / day) is then taken as many as 12 samples each of 8 racehorses using local feed and 4 racehorses use imported feed. The variables measured are digestibility of energy and protein digestibility. The results of the research are digestible energy (local feed ± 85.92 and imported feed ± 87.58) and protein digestibility (local feed ± 75.86 and imported feed 86.89 ±). T test, showed that the energy digestibility of feed imports give effect not significantly different (P> 0.05) compared to local feed while the digestibility of protein feed imports significantly different (P <0.01) in comparison with the local feed. Based on these results it can be concluded that the digestibility of protein for imported feed better than the local feed. Keywords: livestock horses, local feed, imported feed, digestibility