The aim of this investigation was to observe the association in the time course in recovery between multiple heart rate variability
(HRV) metrics and neuromuscular performance, as assessed by mean bar velocity
) in the back squat, over a 72-hr period following an exhaustive back squat protocol.
Eight resistance trained males completed five laboratory visits within a 7-day period. The first visit involved short-term HRV recordings followed by a familiarization of BVM
procedures and a one-repetition max test of the back squat. Forty-eight hours later, participants returned to the laboratory for pre-stimulus measurements, immediately followed by a back squat protocol (8-sets of 10-repetitions at 70% of 1-repetition max with 2-min rest). The HRV and BVM
measurements were replicated at 0.5, 24, 48, and 72 hours post-squat protocol. A multivariate profile analysis and repeated measures correlation between recovery scores [(new/ pre-stimulus)*100] for each HRV metric and BVM
All log transformed (ln) HRV metrics, except low frequency (lnLF) (p
= 0.051), had a significant interaction with BVM
over time (p
< 0.05) indicating recovery scores in BVM
and HRV were not parallel. Additionally, recovery scores in all HRV metrics significantly differed from BVM
0.05) in at least one time point across the 72-hr period. Furthermore, repeated measures correlation analysis indicated a lack of intra-individual association (p
> .05) between the change in BVM
and all HRV measurements over time.
The time course in recovery in HRV measurements following an exhaustive bout of lower-body resistance exercise
was not associated with neuromuscular performance recovery.