Relationships Between Weekly Dynamic Stress Load Volume and Match-Play External and Internal Load: Half-Specific and Full-Competition Analyses in Professional Soccer Players.

The aim of the current study was to examine whether weekly dynamic stress load (DSL) volume could be associated with competition internal and external load outcomes in professional soccer players. Weekly DSL volume was recorded across standardized one-match microcycles. Match outcomes included total distance covered (TDC), high-speed running distance (HSRD), sprint distance (SPRD), high-intensity accelerations (HIACC), high-intensity decelerations (HIDEC), high-metabolic-load distance (HMLD), time spent > 85% of maximum heart rate (HRmax), and Edwards training impulse (Edwards' TRIMP). Analyses of our results revealed that higher weekly DSL volume was associated with greater time > 85%HRmax in the first half (β = 0.00647; p = 0.002) and second half (β = 0.00764; p = 0.026). In the second half, weekly DSL was negatively associated with HSRD (β = -0.3068; p < 0.001) and SPRD (β = -0.0619; p < 0.001), and positively with HMLD (β = 0.3532; p = 0.002). Across the full match, weekly DSL was negatively associated with TDC (β = -0.5080; p = 0.002), HSRD (β = -0.4159; p < 0.001), SPRD (β = -0.0988; p < 0.001), HIACC (β = -0.0265; p = 0.003), and Edwards' TRIMP (β = -0.2251; p = 0.001). Weekly DSL volume may represent an important monitoring tool providing useful information for practitioners aiming to manage fatigue and support competition performance maintenance; however, these findings should be interpreted cautiously until confirmed in larger samples.