Does smartphone-derived heart-rate variability reflect changes in training load in a women's soccer team?
Smartphone-derived heart-rate variability, specifically the supine lnRMSSDx20 CV, is a sensitive marker for tracking changes in training load in female soccer players.
This study supports the use of the mean and CV of lnRMSSD measured across at least 5 d for reflecting weekly values. The supine lnRMSSDx20 CV as measured across 7, 5, and 3 d was the most sensitive marker to the changes in TL in the 3-wk period.
Flatt et al. (Tue,) studied this question.