title: The Influence of Changes in Acute Training Load on Daily Sensitivity of Morning-Measured Fatigue Variables in Elite Soccer Players.
abstract: OBJECTIVE
  To determine the sensitivity of a range of potential fatigue measures to daily training load accumulated over the previous 2, 3, and 4 d during a short in-season competitive period in elite senior soccer players (N = 10).
  
  
  METHODS
  Total highspeed-running distance, perceived ratings of wellness (fatigue, muscle soreness, sleep quality), countermovement-jump height (CMJ), submaximal heart rate (HRex), postexercise heart-rate recovery (HRR), and heart-rate variability (HRV: Ln rMSSD) were analyzed during an in-season competitive period (17 d). General linear models were used to evaluate the influence of 2-, 3-, and 4-d total high-speed-running-distance accumulation on fatigue measures.
  
  
  RESULTS
  Fluctuations in perceived ratings of fatigue were correlated with fluctuations in total high-speed-running-distance accumulation covered on the previous 2 d (r = -.31; small), 3 d (r = -.42; moderate), and 4 d (r = -.28; small) (P < .05). Changes in HRex (r = .28; small; P = .02) were correlated with changes in 4-d total high-speed-running-distance accumulation only. Correlations between variability in muscle soreness, sleep quality, CMJ, HRR%, and HRV and total high-speed-running distance were negligible and not statistically significant for all accumulation training loads.
  
  
  CONCLUSIONS
  Perceived ratings of fatigue and HRex were sensitive to fluctuations in acute total high-speed-running-distance accumulation, although sensitivity was not systematically influenced by the number of previous days over which the training load was accumulated. The present findings indicate that the sensitivity of morning-measured fatigue variables to changes in training load is generally not improved when compared with training loads beyond the previous day's training.
authors.forename: Robin T
authors.initials: RT
authors.lastname: Thorpe
authors.forename: Anthony J
authors.initials: AJ
authors.lastname: Strudwick
authors.forename: Martin
authors.initials: M
authors.lastname: Buchheit
authors.forename: Greg
authors.initials: G
authors.lastname: Atkinson
authors.forename: Barry
authors.initials: B
authors.lastname: Drust
authors.forename: Warren
authors.initials: W
authors.lastname: Gregson
mesh_terms: D056352:Athletes; D005221:Fatigue / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D063806:Myalgia; D064797:Physical Conditioning, Human; D012916:Soccer / Q000502:physiology*; D013997:Time Factors; D055815:Young Adult
keywords: performance; recovery; training; wellness