Spencer, KN, Paget, N, Farley, ORL, and Kilding, AE. Activity profile of elite netball umpires during match play. J Strength Cond Res 34(10): 2832-2839, 2020-The study aimed to determine activity profiles of officials in elite netball. Physical demands of Load·min (au) representing accumulated accelerations by triaxial accelerometers during matches and exercise-to-rest ratio were measured using global positioning systems (Catapult, MinimaxX S4). Physiological demands were quantified by estimated equivalent distance and heart rate (HR) (MeanHR, percentage HRpeak, and HRzones) and movement variables (frequency, mean time, and percentage of total time) were coded using Sportscode Elite (Version 10, Hudl, Lincoln, Nebraska). Differences were analyzed by periods (Q1-Q4). Load·min (au) (M = 407 ± 66) significantly varied with time (F [3, 55] = 3.42, p = 0.02) and the highest percentage of exercise-to-rest performed in Q1 (21 ± 5%). Estimated equivalent distance (3,839 ± 614 m) varied significantly with time (F [3, 56] = 3.18, p = 0.03), the umpires spent longest duration of time (35%) in HRzone 3 (75-85% of HRpeak). Mean HR significantly decreased with time (p < 0.01; Q1 [157 ± 13], quarter 2 [156 ± 12], and Q4 [153 ± 14]). Umpires spent 77% in rest-recovery ratio movements and 23% of time exercise-to-rest ratio. In summary, netball umpiring is characterized by intermittent, short, high-intensity activity (sprinting, sidestepping, and turn to change direction), with increasing periods of rest-recovery (walking and standing).