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This research investigates how different training methods impact the internal load and fatigue in male cross-country skiers during summer training.

Internal Load and Fatigue Characteristics in Male Cross-Country Skiers During Summer Training

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Observational study measures internal load and fatigue in male cross-country skiers, suggesting varied training impacts.

This research investigates how different training methods impact the internal load and fatigue in male cross-country skiers during summer training.
Longitudinal observational design with twelve male cross-country skiers.
Measurement of internal load using Firstbeat sport devices based on the bTRIMP model.
Assessment of fatigue through resting heart rate (RHR) and quick recovery test percentage (QRT%).
Maximum oxygen consumption (V̇o2max) evaluated as a physiological performance indicator.
Statistical analysis with significance set at p < 0.05.
Internal load decreased progressively over the 3-week training period.
bTRIMP values were significantly higher during competition sessions compared to routine training.
Strength-related training sessions showed the lowest bTRIMP values, while roller skiing produced the highest.
Post-competition QRT% was significantly lower than post-training values.
No significant differences in RHR and QRT% were found across various training modalities.

Du et al. (2026) studied this question.

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