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Figure 4. Mean±SD HR (Heart rate) responses during the first 45-min half of the soccer-specific intermittent protocol under AH (Active Heating), PH (Passive Heating), and Cont (Control) conditions. N=6. Significant difference (P<0.05):-b, between AH and Cont. Table 1. Metabolic responses to exercise under AH (Active Heating), PH (Passive heating) and Cont (Control) conditions.
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The data from the current investigation demonstrate that active (AH) and passive prewarming (PH) strategies increase the short-term thermoregulatory strain during soccerspecific intermittent exercise in ambient temperatures of 19°C, compared with preexercise rest. Current findings also indicate that the effects of pre-warming on the physiological response to soccer-specific intermittent exercise are independent of the prewarming strategy utilised. The present observations suggest that the physiological changes arising as a result of pre-warming strategies are unlikely to have detrimental

effects on the performance of a 90-min soccer-specific simulation under the current environmental temperatures.