Why the study?
The study was conducted to report changes in training characteristics, performance, and heart-rate variability in the world's most successful male biathlete of the last decade.
In an elite endurance athlete, performance improvement was strongly correlated with increased low-intensity training volume and parasympathetic activity markers.
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High-volume LIT training correlated with performance and parasympathetic HRV in one elite case; leaves open generalizability and causality for athletes or patients.
Schmitt et al. (2020) studied this question.
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