Abstract
Purpose: To examine the relationship of external:internal training load ratios with fitness and assess the impact of fatigue. Method: Ten soccer players performed a lactate threshold test followed by two soccer simulations (BEAST90mod) 48 h apart. Recovery (TQR) and muscle soreness (DOMS) was measured before each trial. Internal Training load (TL) (iTRIMP) and external load total distance (TD), high intensity distance (HID), PlayerLoad™ (PL) mean metabolic power (MMP) high metabolic power distance (HP) were collected for each trial and external:internal ratios produced. The relationships between ratios and velocity at lactate threshold (vLT) and velocity at Onset of Blood Lactate Accumulation (vOBLA) were examined in both trials along with changes in ratios. Results: Total Quality of Recovery and DOMS showed large changes. There were trivial to large decreases in TL from trial 1 to 2. Moderate increases in ratios for TD:iTRIMP, PL:iTRIMP and MMP:iTRIMP were seen but only small/trivial for HP:iTRIMP and HID:iTRIMP. In rested conditions all ratios show large relationships with vLT and vOBLA. However vLT vs. HID:iTRIMP; PL:iTRIMP; HP:iTRIMP and vOBLA vs. TD:iTRIMP; PL:iTRIMP; MMP:iTRIMP became weaker under fatigue. Conclusions: Acute changes in the ratios have implications forthe use of ratios as fitness measures but also as indicators of fatigue.
Highlights
The frequent assessment of fitness is important in sports to determine performance capability. frequent fitness testing in sports with high competition density such as soccer is difficult due to the conflicting requirements and time demands of technical and physical training [1]
One recent development that may be used for the frequent assessment of fitness is the use of an integrated external:internal training load ratio
Barrett and Abt [3] demonstrated that combining the individualized training impulse with the total distance (TD) and high intensity distance
Summary
The frequent assessment of fitness is important in sports to determine performance capability. Frequent fitness testing in sports with high competition density such as soccer is difficult due to the conflicting requirements and time demands of technical and physical training [1]. There is the scarcity of periods where fatigue is not a factor in preventing players demonstrating their maximal performance capability during testing. Performance measures of physical output are prone to high variability in game-play making meaningful inferences difficult [2]. One recent development that may be used for the frequent assessment of fitness is the use of an integrated external:internal training load ratio. Barrett and Abt [3] demonstrated that combining the individualized training impulse (iTRIMP) with the total distance (TD) and high intensity distance
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