Effects of systems of play on the heart rate response and the contribution of aerobic-anerobic systems during selection football match play
This study was conducted on state level Indian footballers (N=20; 2 Goalkeepers and 6 each were Defenders, Midfielders, and Forwards) during selection matches. This study highlights the effects of two systems of play (4-3-3 and 4-4-2) on the heart rate (HR) of the Midfielders. Relative contribution of the aerobic and anerobic systems was also evaluated during matches. Results show that in both the systems, mean HR of the Midfielders were almost identical (169.4±13.8 beats/min and 170.3±14.1 beats/min respectively). The overall cardiovascular stress, as indicated by Maximum Heart Rate Reserve (MHRR), is highest on the Midfielders (75.2±2.2%) followed by Forwards (73.1±3.5%), Defenders (65.9±4.2%) and Goalkeepers (28.5±0.4%). Outfield footballers played majority of the time in the aerobic zone (76±5.9%, 79.8±4.1%, and 92.5±3.3% of the total time of play in Forwards, Midfielders and Defenders respectively) whereas the Goalkeepers played almost exclusively in the aerobic zone. The study concludes that (a) overall cardiovascular stress on the Midfielders does not vary in the 4-3-3 and 4-4-2 systems of play, (b) Midfielders and Forwards play with higher workload than Defenders and Goalkeepers, and (c) majority of the energy is derived aerobically during selection trail football match play.
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