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Training and competition load can cause neuromuscular fatigue (NMF) and modified movement strategy such as an increase in the contribution of the medio-lateral [PlayerLoad TM  ML (%)] and decrease in the % vertical [PlayerLoad TM  V (%)] vectors, to total PlayerLoad TM  (accelerometer derived measurement in vertical, medio-lateral, and anterior-posterior planes) in matches. NMF assessment involves expensive equipment, however, given the modification of match movement strategy with NMF, this may be present in a standardized drill. The aim of this study was to determine the utility of a small sided game (SSG) for the measurement of NMF.   Materials and Methods:  Data was collected throughout a competitive football season. External load was quantified using global positioning system (GPS) and accelerometry, and internal load by session rating of perceived exertion (sRPE). A 5 vs. 5 SSG and countermovement jump (CMJ), for determination of flight time:contraction time (FT:CT), were performed the day prior to each match. Weekly volume from GPS, PlayerLoad TM  and sRPE were calculated across the season. Weekly SSG activity profile and FT:CT was compared between “high” and “low” load weeks determined relative to season average. SSG activity profile was assessed between weeks where FT:CT was above or below pre-season baseline. Impact on match activity profile was examined between weeks where FT:CT and SSG activity profile were higher or lower than baseline. The difference (high vs. low load and < or > pre-season baseline) was calculated using the effect size (ES) ± 90% CI and practically important if there was a >75% likelihood of exceeding an ES of 0.2.   Results:  All weekly load metrics increased SSG PlayerLoad TM ⋅m⋅min -1  when above season average, however, the impact on FT:CT was trivial. Reduced weekly FT:CT compared to baseline resulted in lower SSG PlayerLoad TM ⋅min -1  and PlayerLoad TM Slow⋅min -1 . FT:CT below baseline increased match PlayerLoad TM  ML (%) and decreased PlayerLoad TM  V (%) during subsequent match play. Similarly, a reduction in SSG PlayerLoad TM ⋅m⋅min -1  was followed by increased match PlayerLoad TM  ML (%).   Conclusion:  Changes in select match activity profile variables following a reduction in SSG PlayerLoad TM  m.min -1 , mirror those seen when FT:CT is reduced. Increased PlayerLoad TM  ML (%) during matches likely represents fatigue driven modification to movement strategy. Small-sided games may be a useful tool to detect NMF.

A Standardized Small Sided Game Can Be Used to Monitor Neuromuscular Fatigue in Professional A-League Football Players