Ultra-short-term (30 s or 1 min) records of LnRMSSDmean and short-term (≥2 min) records of LnRMSSDcv showed nearly perfect reliability and small bias compared to standard 5-minute HRV recordings.
Observational (n=14)
Does ultra-short-term heart rate variability recording provide reliable measures compared to standard 5-minute recording in U-20 national futsal players?
Ultra-short-term HRV recording (30s or 1 min for LnRMSSDmean, and at least 2 min for LnRMSSDcv) is a reliable alternative to standard 5-minute recording in U-20 futsal players.
The aim of this study was to examine ultra-short-term and short-term heart rate variability (HRV) in under-20 (U-20) national futsal players during pre-tournament training camps and an official tournament. Fourteen male U-20 national futsal players (age = 18.07 ± 0.73 yrs; height = 169.57 ± 8.40 cm; body weight = 64.51 ± 12.19 kg; body fat = 12.42% ± 3.18%) were recruited to participate in this study. Early morning 10 min resting HRV, Borg CR-10 scale session rating of perceived exertion (sRPE), and general wellness questionnaire were used to evaluate autonomic function, training load, and recovery status, respectively. Log-transformed root mean square of successive normal-to-normal interval differences (LnRMSSD) was used to compare the first 30 s, first 1 min, first 2 min, first 3 min, and first 4 min with standard 5 min LnRMSSD. Mean (LnRMSSDmean) and coefficient of variation (LnRMSSDcv) of LnRMSSD were used to compare the different time segments of HRV analysis. The result of LnRMSSDmean showed nearly perfect reliability and relatively small bias in all comparisons. In contrast, LnRMSSDcv showed nearly perfect reliability and relatively small bias from 2-4 min time segments in all study periods. In conclusion, for accuracy of HRV measures, 30 s or 1 min ultra-short-term record of LnRMSSDmean and short-term record of LnRMSSDcv of at least 2 min during the training camps are recommended in U-20 national futsal players.
Chen et al. (Sun,) conducted a observational in U-20 national futsal players (n=14). Ultra-short-term and short-term HRV recording vs. Standard 5 min HRV recording was evaluated on Reliability and bias of ultra-short-term and short-term LnRMSSDmean and LnRMSSDcv compared to standard 5 min recording. Ultra-short-term (30 s or 1 min) records of LnRMSSDmean and short-term (≥2 min) records of LnRMSSDcv showed nearly perfect reliability and small bias compared to standard 5-minute HRV recordings.