The dose–response relationship between training-load measures and aerobic fitness in elite academy soccer players

Matthew Ellis, Ryan Penny, Ben Wright, Mark Noon, Tony Myers, Ibrahim Akubat

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12 Citations (Scopus)
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The aim of the current study is to examine the dose–response relationships between training load (TL) measures and the consequent changes in aerobic fitness. Data were collected over the 6-week pre-season period in elite youth soccer players. Participants completed a lactate threshold test to identify changes in treadmill speed at 2 mmol · l−1 (S2) and 4 mmol · l−1 (S4). Internal TL was quantified with the following training impulse (TRIMP) methods: Banister TRIMP, Edwards TRIMP, Lucia TRIMP, individual TRIMP (iTRIMP) and rate of perceived exertion was also collected. External TL measures were total distance, PlayerLoad, high speed running (14.4–19.8 km · h−1), very high-speed running (19.8–25.2 km · h−1) and maximal sprint distance (>25.2 km · h−1). Individual high-speed distance was derived from each participants treadmill speed at S4. Different Bayesian regression models were run with different likelihood functions. The best-fitting models with both the lowest out-of-sample prediction error and the highest variance explained (R 2) were used. iTRIMP had the strongest relationships with changes in S2 (r = 0.93, R2 = 0.90) and S4 (r = 0.88, R2 = 0.82). Explained variance ranged from 10%–69% and 11%–38% for all other internal TL measures and external measures, respectively. In summary, the iTRIMP method demonstrates a dose–response relationship with changes in aerobic fitness in elite youth soccer players.
Original languageEnglish
Pages (from-to)128-136
Number of pages9
JournalScience and Medicine in Football
Issue number2
Early online date9 Sept 2020
Publication statusPublished - 2021

Bibliographical note

This is an Accepted Manuscript of an article published by Taylor & Francis in Science and Medicine in Football, on 09/09/2021, available online:

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  • iTRIMP
  • GPS
  • monitoring


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