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The monitoring of the high intensity activity-demands profile during official matches (OMs) and training sessions (TSs) provides a deeper understanding of the relationship between training and competition loads as well as players' fitness characteristics. The aims of this study were to: 1) describe the training and match high intensity activity-demands profile in U-19 soccer players; 2) compare the profile depending on the type of session (OM or TS) throughout match-weeks; and 3) differentiate between profiles depending on the match location (home or away). Twenty-five U-19 Spanish soccer players were monitored during TSs and OMs for a one-month competitive period using a WIMU PRO TM wearable inertial device. The variables of the study were: high speed running distance (HSRD), total sprints (SPs), maximum speed (MS) and player load (PL). OMs required higher demands than TSs in HSRD (460.99 ± 206.18 vs. 315.45 ± 180.12 m; p &lt; 0.01; d = 0.75), SPs (10.86 ± 6.64 vs. 7.23 ± 4.82; p &lt; 0.01; d = 0.69), MS (29.99 ± 2.54 vs. 28.50 ± 2.4 km/h; p &lt; 0.01; d = 0.59) and PL (103.08 ± 24.15 vs. 83.18 ± 17.96 a.u.; p &lt; 0.01; d = 0.94). The interaction between the type of session and mean week's demands presented differences with medium effect size in MS (p &lt; 0.01; ω p  2 = 0.06) and small effect size in HSRD (p = 0.04; ω p  2 = 0.03), and SP (p = 0.05; ω p  2 = 0.03), but there were no differences in PL (p = 0.18; ω p  2 = 0). Finally, no differences were found in the match location comparison (p &gt; 0.33; d = 0.22-0.33). Therefore, the profiles presented could be useful for future scientific purposes and serve as valid information for coaches trying to optimize performance.

Match and Training High Intensity Activity-Demands Profile during a Competitive Mesocycle in Youth Elite Soccer Players