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- W4387444934 abstract "Introduction: Rugby league is a contact sport played at amateur, semi-professional and professional levels. The typical game includes intense bouts of running, tackling, and short periods of recovery. Previous work has developed physiological and anthropometric profiles of professional rugby league players but to date there is sparse data on semi-professional players. The aim of the current study is to investigate the physiological and anthropmetric characteristics of semi-professional rugby league players across a typical season, including pre- and post-season data. Methods: Thirty-five semi-professional rugby league players (16 Backs and 17 forwards) were measured for height, body mass, sum of skinfolds, and speed (20m sprint). Skinfold data was collected at beginning of pre-season, 2mths into pre-season and week season started. Global positioning system (GPS) data, sampling at 10 Hz, were collected during three Queensland Cup rugby league matches for 10 players (backs and forwards), looking at total distance (km), sprint distance (m), power plays, energy expenditure (kcal), player load, top speed (m/s) and distance and time in speed zone 1 (0-1m/s), zone 2 (1-3m/s), zone 3 (3-5m/s), zone 4 (5-7m/s) and zone 5 (7-12m/s). Results: Compared with forwards the backs had significantly (p= 0.19)) lower body mass (99.4kg SD 10.5 vs 90.8kg SD 7.3), and significantly (p=0.005) greater speed during 20m sprint (3.00sec SD .07 vs 3.1sec SD .11. Values for sum of skinfolds were not significantly different (p>0.05) between backs and forwards across the three time points, time 1 (104.2mm vs 106.2mm), time 2 (103.9mm vs 110.9mm) and time 3 (93.8mm vs 108.1mm). Reviewing the GPS data across the three cup games revealed a number of significant differences between forwards and backs, backs covered greater overall distance throughout the games (6.3km vs 4.9km), sprint distance (354.6m vs 215.9m), power plays (30 vs 21), energy expenditure (958 vs 740kcal), player load (310 vs 264), top speed (7.5m/s vs 7.0m/s). Distance in speed zone was significantly greater for the backs vs forwards for zone 1(1.09km vs 0.90km), zone 2 (3.6km vs 2.7km), zone 3 (1.3km vs 1.1km), and zone 4 (0.33km vs 0.21km) and not significant for zone 5 (196m vs 55m) Time in speed zone was significantly greater for the backs vs forwards for zone 2 (37min vs 27min), zone 3 (5.7min vs 5min), and zone 4 (59sec vs 37sec). For zone 1 the forwards spent significantly more time here than backs (52min vs 40min) and no significant difference for zone 5. Discussion: Comparing our present findings to other QC data, the distance travelled in a game for both forwards and backs is significantly lower, backs (7.5km vs 6.3km) and forwards (6.7km vs 4.9km). The sprints during a game showed a similar trend to previous work with backs covering significantly more sprint distance and this was also reflected in the 20m sprint test. However, it is still important to develop speed and acceleration and a focus of short sprints is a priority. Anthropometric data indicated higher sum of skinfolds in our cohort compared to other semi-elite players, but interestingly across the three testing times backs skinfolds did show a decrease but forwards stayed relatively stable. These data indicate that whilst high body mass is important in rugby league, low body fat is vital so performance is not compromised. Low sum of skinfolds is associated with improved sprint times, vertical jump and maximum aerobic power. Tracking this data across the season will give vital information to the coach and strength and conditioning, so they can tailor training and ensure appropriate nutrition strategies are in place. This should then be reflected in the data set that is collected. Impact/Application to the field: The findings show that the physiological and anthropometric characteristics in the current study are below that of similar level players. Therefore, a focus needs to be on higher physical demands in training to build muscle mass and decrease body fat, which in turn will be reflected in increased sprint times and endurance of the sprints as well as endurance capacity to perform at a similar level in both halves of the game. Declaration: My co-authors and I acknowledge that we have no conflict of interest of relevance to the submission of this abstract." @default.
- W4387444934 created "2023-10-10" @default.
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- W4387444934 date "2023-10-01" @default.
- W4387444934 modified "2023-10-11" @default.
- W4387444934 title "Anthropometric and physical qualities of semi-professional rugby league players" @default.
- W4387444934 doi "https://doi.org/10.1016/j.jsams.2023.08.050" @default.
- W4387444934 hasPublicationYear "2023" @default.
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