RT info:eu-repo/semantics/article T1 Match physical and physiological response of amateur soccer referees: A comparison between halves and match periods A1 Ozaeta, Eñaut A1 Fernandez Lasa, Uxue A1 Martínez Aldama, Inmaculada A1 Cayero, Ruth A1 Castillo Alvira, Daniel K1 Referees K1 Arbitraje K1 Soccer K1 Soccer - Training K1 Fútbol K1 Fútbol - Entrenamiento K1 Soccer - Tournaments K1 Sports K1 Football - Rules K1 Deporte K1 Reglamento K1 External load K1 Heart Rate K1 Ritmo cardíaco K1 Public Health K1 2411.06 Fisiología del Ejercicio K1 3212 Salud Publica AB The aim of this paper was to examine the differences in the external and internal load in amateur match officials between the 1st and 2nd half and among different 15 min periods. Twenty-three field referees (FRs) and 46 assistant referees (ARs) from the Spanish División de Honor participated in this study. Match external and internal loads were monitored showing that FRs recorded a lower Powermean, Speedmean, Cadencemean and Stiffnessmean (p < 0.05; d = 0.52 to 0.57) during the 2nd half and they also recorded a lower HRmean, and HRpeak, and spent less time in zone 5 (p < 0.05; d = 0.50 to 0.62). The FRs’ match load decreased during the match but they performed higher Powermean and covered more distance in the last 15 min of the match (p < 0.01; d = 0.87 to 4.28). The ARs external load did not show significant variations between halves, but ARs recorded a lower HRmean and spent less time in zone 5 (p < 0.01; d = 0.41 to 0.63), and the highest values of Powermean, Speedmean, Cadencemean and Vertical oscillationmean during the first 15 min of the match (p < 0.05; d = 0.45 to 0.75). The highest values of HRmean and distance covered were in the 0–15 min period. Results suggest that match load decreases as the match progresses because of the neuromuscular fatigue but increases in the last 15 min. PB MDPI SN 1660-4601 YR 2022 FD 2022 LK https://uvadoc.uva.es/handle/10324/63108 UL https://uvadoc.uva.es/handle/10324/63108 LA eng NO International Journal of Environmental Research and Public Health, 2022, Vol. 19, Nº. 3, 1306 NO Producción Científica DS UVaDOC RD 10-jun-2024