Abstract
PURPOSE: The aim of this study was to investigate the physiological demands of a match under the new rules as compared to the old rules. METHODS: Four matches analyzing 16 elite Chinese field hockey players (Height:178±4.41cm:, Weight:76.50±6.12kg) were record by using global positioning system (SPI Elite, GPSports, Australia) and analyzed using Team AMS (v2014.11) software during 2015 Chinese National Tournament. All the matches were filmed by using two high definition cameras (HDR-SR12E, Sony, Japan), which were placed on the top of the stadium and filmed each half field respectively. Exact timing, including beginning and ending of each quarter, timing and details of substitutions, playing time of each player and positional changes, were reviewed post-match and used to edit the GPS data. Multiple paired t-tests were used to compare data between different positions and different quarters. Significance was set at P≤0.05. Average values were used to compare differences between new rules’ and old rules’ hockey matches. RESULTS: The mean total distance covered by each player was 5788±1710m, and overall mean playing time was 37.8±14.0min. Compared with other positions, strikers had a significantly greater high-intensity activity (>14km/h) percentage (strikers: 29.7±4.8%; midfielders:25.6±5.8%; defenders: 17.9±3.3%; P<0.01). Average sprint (defined as speed >19km/h, interval of at least 1 second) counts for each player was 25.5±9.9 per match, with an average duration of 2.5±0.3s. About 75% of sprint distances were between 5-20m, with recovery times varying greatly, however the two most frequently observed recovery times were >120s (36%) and 0-40s (35%). The average repeated-sprint (defined as time interval between two sprints was less than 60s) counts were 11.4±6.9, and the average percentage of repeated-sprint counts and average recovery interval of repeated-sprints were 40.1±16.8% and 23.0±8.3s respectively. CONCLUSIONS: These results suggest that players are required to complete more high intensity bouts in a shorter time period (37.8±14.0 vs. 51.9±17.8 min) however average total distance was less under the new IHF rules. Supported by NSSFC and Xinmiao Project through key project 13BTY049 and 2016R40593.
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