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The effects of a cooling strategy following repeated high-intensity running (RHIR) on soccer kicking performance in a hot environment (&gt;30ºC) were investigated in youth soccer players. Fifteen academy under-17 players participated. In Experiment 1, players completed an all-out RHIR protocol (10×30 m, with 30s intervals). In Experiment 2 (cross-over design), participants performed this running protocol under two conditions: (1) following RHIR 5 minutes of cooling where ice packs were applied to the quadriceps/hamstrings, (2) a control condition involving passive resting. Perceptual measures [ratings of perceived exertion (RPE), pain and recovery], thigh temperature and kick-derived video three-dimensional kinematics (lower limb) and performance (ball speed and two-dimensional placement indices) were collected at baseline, post-exercise and intervention. In Experiment 1, RHIR led to small-to-large impairments ( p  &lt; 0.03;d = −0.42–-1.83) across perceptual, kinematic and performance measures. In experiment 2, RPE ( p  &lt; 0.01; Kendall’s W = 0.30) and mean radial error ( p  = 0.057; η 2  = 0.234) increased only post-control. Significant small declines in ball speed were also observed post-control ( p  &lt; 0.05; d = 0.35). Post-intervention foot centre-of-mass velocity was moderately faster in the cooling compared to control condition ( p  = 0.04; d = 0.60). In youth soccer players, a short cooling period was beneficial in counteracting declines in kicking performance, in particular ball placement, following intense running activity in the heat.

journal of sports sciences

Recovery of kicking kinematics and performance following repeated high-intensity running bouts in the heat: Can a rapid local cooling intervention help young soccer players?