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. 2021 Sep 9;14(5):665–673. doi: 10.1177/19417381211044739

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© 2021 The Author(s)

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Figure 2. — Overview of the identified biomarkers and tools potentially diagnostic of overtraining syndrome (OTS). CPX, cardiopulmonary exercise test; EEG, electroencephalography; HRV, heart rate variability; ITT, insulin tolerance test; POMS, Profile of Mood State; psy. questionnaires, psychological questionnaires; TBE, 2-bout exercise test.