Key result
Hydration status indicators are not associated with morning resting HRV in athletes.
Why the study?
The study was conducted to examine the relationship between resting morning heart rate variability metrics and indirect markers of hydration status in elite male athletes.
Are indirect indicators of morning hydration status (urine specific gravity and day-to-day body mass changes) associated with resting morning supine and standing heart rate variability metrics in elite male field hockey players?
Observational (n=22)
No
Are indirect indicators of morning hydration status (urine specific gravity and day-to-day body mass changes) associated with resting morning supine and standing heart rate variability metrics in elite male field hockey players?
Resting morning supine and standing heart rate variability metrics are not confounded by normal day-to-day variations in morning hydration status (measured via urine specific gravity and body mass changes) in elite male field hockey players.
Answers are grounded in this paper and cite their sources.
HRV metrics may be interpreted without hydration adjustment in elite athletes; hypothesis-generating and leaves broader applicability open.
The aim of this study was to examine the relationship between resting morning heart rate variability (HRV) metrics and indirect markers of hydration status in elite male athletes. Twenty-two field hockey players (age 26.8 ± 3.4 yr; height 178.4 ± 6.3 cm; body mass 76.2 ± 7.4 kg) were monitored over 10-d during a pre-Olympic training camp. Measurement of heart rate variability (HRV) during an orthostatic challenge, urine specific gravity (Usg, first morning void) and body mass were captured on seven of the mornings. Individual generalized linear mixed models evaluated the relationships between supine and standing HRV metrics with Usg and day-to-day change in body mass. No meaningful relationships were identified between supine (estimates −0.002 to 0.001) or standing (−0.002 to 0.003) HRV metrics and Usg as well as between supine (−0.003 to 0.016) or standing (−0.004 to 0.006) HRV metrics and changes in body mass. These outcomes indicate that supine and standing HRV metrics are not influenced by indirect indices of hydration status in elite male field hockey players.
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Vescovi et al. (2021) conducted an observational in Hydration status and resting morning heart rate variability in elite male athletes (n=22). Indirect indicators of morning hydration status (first morning void urine specific gravity and day-to-day percent change in morning body mass) was evaluated on Resting morning supine and standing heart rate variability (HRV) metrics during a 10-minute orthostatic challenge (including LnRMSSD, LnLF power, LnHF power, LnLF:HF ratio, LnTP, Ln stress score, and Lnstress score:SD1 ratio) (GLMM estimate 0.000 for supine LnRMSSD vs Usg, 95% CI -0.002 to 0.002, p=0.934). Indirect indicators of hydration status (urine specific gravity and body mass changes) showed no meaningful relationship with supine or standing HRV.
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