scholarly journals Suitability of Ultra-Short-Term Heart Rate Variability in Military Trainees

Healthcare ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 409
Author(s):  
Mubarak J. Alalyan ◽  
Shaea A. Alkahtani ◽  
Syed Shahid Habib ◽  
Andrew A. Flatt
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Male Students ◽  
Short Term ◽  
Suitable Alternative ◽  
Status Monitoring ◽  
Rr Interval ◽  
Resting Heart Rate Variability ◽  
Interval Ratio ◽  
Stabilization Period

We aimed to (a) evaluate the agreement between ultra-short-term and criterion resting heart rate variability (HRV) measures in military trainees, and (b) compare associations between HRV recording lengths and body composition. HRV recordings were performed for 10 min in 27 military male students. Mean RR interval, the root-mean square of successive differences (RMSSD), RMSSD:RR interval ratio, standard deviation of normal-to-normal RR intervals (SDNN), and SDNN:RR interval ratio were determined from the last 5 min of the 10-min recording and considered the criterion. Parameters were also recorded in successive 1-min epochs from the 5-min stabilization period. No differences were observed between criterion values and any of the 1-min epochs (p > 0.05). Effect sizes ranged from −0.36–0.35. Intra-class correlations ranged from 0.83–0.99. Limits of agreement ranged from 38.3–78.4 ms for RR interval, 18.8–30.0 ms for RMSSD, 1.9–3.1 for RMSSD:RR, 24.1–31.4 ms for SDNN, and 2.5–3.0 for SDNN:RR. Body fat% was associated (p < 0.05) with all HRV parameters at varying time segments. A 1-min HRV recording preceded by a 1-min stabilization period seems to be a suitable alternative to criterion measures. Ultra-short procedures may facilitate routine HRV tracking in tactical populations for status-monitoring purposes.

Heart rate variability measures: a fresh look at reliability

2007 ◽  
Vol 113 (3) ◽  
pp. 131-140 ◽  
Author(s):  
Gian Domenico Pinna ◽  
Roberto Maestri ◽  
Antoni Torunski ◽  
Ludmila Danilowicz-Szymanowicz ◽  
Malgorzata Szwoch ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Sample Size ◽  
Random Error ◽  
Short Term ◽  
Worst Case ◽  
Paced Breathing ◽  
Relative Reliability ◽  
Rr Interval ◽  
Random Variation

Despite its extensive use in physiological and clinical research, the analysis of HRV (heart rate variability) is still poorly supported by rigorous reliability studies. The main aim of the present study was to perform an in-depth assessment of absolute and relative reliability of standard indexes of HRV from short-term laboratory recordings. In 39 healthy subjects [mean age (min–max): 38 (26–56) years; 18 men and 21 women] we recorded 5 min of supine ECG during spontaneous and paced (15 breaths/min) breathing. The test was repeated on the next day under the same conditions. From the RR intervals we computed standard indexes of HRV: SDNN (S.D. of RR interval values), RMSSD (root-mean-square of successive RR interval differences), LF (low frequency) and HF (high frequency) power (absolute and normalized units) and LF/HF. Absolute reliability was assessed by 95% limits of random variation; relative reliability was assessed by the ICC (intraclass correlation coefficient). The sample size needed to detect a mean difference ≥30% of the between-subject S.D. was also estimated. Although there was no significant mean change between the two tests, we found that in individual subjects the second measurement was as high/low as 1.9/0.5 times (SDNN, best case) and 3.5/0.3 times (LF/HF, worst case) the first measurement, due to pure random variation. For most parameters the ICC was >0.8 (range 0.65–0.88). The estimated sample size ranged from 24–98 subjects. Reliability indexes tended to improve during paced breathing. We conclude that short-term HRV parameters are subject to large day-to-day random variations. Random error, however, represents a limited part of the between-subject variability; therefore observed differences between individuals mostly reflect differences in the subjects' error-free value rather than random error. Overall, paced breathing improves reliability.

Association between RR interval and high-frequency heart rate variability acquired during short-term, resting recordings with free and paced breathing

2008 ◽  
Vol 29 (7) ◽  
pp. 795-802 ◽  
Author(s):  
Gavin Sandercock ◽  
Valerie Gladwell ◽  
Samantha Dawson ◽  
David Nunan ◽  
David Brodie ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
High Frequency ◽  
Short Term ◽  
Paced Breathing ◽  
Rr Interval

Reliability of heart rate variability measurements in patients with a history of myocardial infarction

2010 ◽  
Vol 118 (3) ◽  
pp. 195-201 ◽  
Author(s):  
Roberto Maestri ◽  
Grzegorz Raczak ◽  
Ludmila Danilowicz-Szymanowicz ◽  
Antoni Torunski ◽  
Adam Sukiennik ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Left Ventricular ◽  
Left Ventricular Ejection ◽  
Short Term ◽  
Worst Case ◽  
Ventricular Ejection Fraction ◽  
Paced Breathing ◽  
Rr Interval

Despite a well-established prognostic value in cardiac patients, HRV (heart rate variability) indexes have been used little in the clinical setting. Poor reliability of the measurements might be a possible explanation for this. In the present study, we assessed the reliability of short-term HRV indexes in post-MI (myocardial infarction) patients. We studied 61 MI patients [50 males; age, 59±8 years; and LVEF (left ventricular ejection fraction), 46±6%; values are means±S.D.], who underwent a 5+5 min ECG recording during spontaneous and paced breathing on two consecutive days. Standard time-domain [SDNN (S.D. of RR interval values) and RMSSD (root-mean-square of successive RR interval differences)] and frequency-domain [LF (low-frequency) and HF (high-frequency) power, and LF/HF] indexes of HRV were computed. Absolute and relative reliability were assessed by the 95% limits of random variation and by the ICC (intra-class correlation coefficient). The agreement between the two measurements in classifying patients at low or high risk, according to different cut-points, and the sample size needed to detect a clinically relevant change, were also assessed. During spontaneous breathing, individual changes in test–retest measurements ranged from −41 to +61% (SDNN; best case) and from −76 to +316% (LF/HF; worst case). The ICC ranged from 0.72 to 0.81. Most patients (79–90%) were assigned to the same class by the two measurements. Paced breathing did not improve reliability. In conclusion, short-term HRV parameters in MI patients may have large day-to-day variations, making the detection of treatment effects in individual patients difficult; however, the ICC values and the analysis of the consistency of classification between repeated tests indicate that HRV measurements fulfil the criteria required to be used for diagnostic or classification purposes.

scholarly journals Agreement of Ultra-Short-Term Heart Rate Variability Recordings During Overseas Training Camps in Under-20 National Futsal Players

2021 ◽  
Vol 12 ◽  
Author(s):  
Yung-Sheng Chen ◽  
Jeffrey C. Pagaduan ◽  
Pedro Bezerra ◽  
Zachary J. Crowley-McHattan ◽  
Cheng-Deng Kuo ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Correlation Coefficients ◽  
Early Morning ◽  
Short Term ◽  
National Team ◽  
Natural Logarithm ◽  
Overseas Training ◽  
Postural Stabilization ◽  
Resting Heart Rate Variability

Background: Monitoring the daily change in resting heart rate variability (HRV) can provide information regarding training adaptation and recovery status of the autonomic nervous system (ANS) during training camps. However, it remains unclear whether postural stabilization is essential for valid and reliable ultra-short-term (HRVUST) recordings in short-term overseas training camps.Design: Observational and longitudinal study.Purpose: This study aimed to investigate ultra-short-term heart rate variability recordings under stabilization or post-stabilization periods in four overseas training camps.Participant: Twenty-seven U-20 male national team futsal players voluntarily participated in this study.Method: Resting HRV was evaluated for 10 min during the early morning of each training camp. The natural logarithm of the root mean square of successive normal-to-normal interval differences (LnRMSSD) was used for comparisons. Time segments of HRV were divided into two periods with three measures within each: (1) the first 30-s (1st_30 s LnRMSSD), the first 60-s (1st_60 s LnRMSSD), and the 5-min standard (1st_5 min LnRMSSD) during stabilization; (2) the first 30-s (2nd_30 s LnRMSSD), the first 60-s (2nd_60 s LnRMSSD), and the 5-min standard (2nd_5 min LnRMSSD) after stabilization.Result: The results demonstrated trivial to small ES (−0.03; 0.46), very large to nearly perfect ICC (0.76; 0.98), and narrow range of SEM (0.06; 0.31) when all time segments of HRVUST were compared to the 1st_5 min and 2nd_5 min HRV. Furthermore, the magnitude of the correlation coefficients ranged from very high to nearly perfect for all the time segments (r = 0.83; 0.97). The HRVUST posted excellent agreement in all time segments (bias = −0.05; 0.12) with/without postural stabilization. Trivial to small levels of effect size in all time segments of LnRMSSDmean (0.02; 0.41 ES) and LnRMSSDcv (−0.49; −0.02 ES) across overseas training camps was identified.Conclusion: The first 30 or 60-s LnRMSSD recordings can be used to evaluate daily cardiac-autonomic function during overseas training camps in futsal players. The process for stabilization seems to be unnecessary for measuring the morning resting LnRMSSD in overseas training camps among young adult futsal players.

Regional Frontal Lobe Response Magnitudes During Affective Shifting Covary With Resting Heart Rate Variability in Healthy Volunteers

2016 ◽  
Vol 30 (4) ◽  
pp. 165-174 ◽  
Author(s):  
Ryan Smith ◽  
John J.B. Allen ◽  
Julian F. Thayer ◽  
Richard D. Lane
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Healthy Subjects ◽  
Emotional Reactivity ◽  
Bold Signal ◽  
Resting Heart Rate ◽  
Functional Magnetic Resonance ◽  
Absolute Value ◽  
Cardiac Vagal Control ◽  
Resting Heart Rate Variability

Abstract. We hypothesized that in healthy subjects differences in resting heart rate variability (rHRV) would be associated with differences in emotional reactivity within the medial visceromotor network (MVN). We also probed whether this MVN-rHRV relationship was diminished in depression. Eleven healthy adults and nine depressed subjects performed the emotional counting stroop task in alternating blocks of emotion and neutral words during functional magnetic resonance imaging (fMRI). The correlation between rHRV outside the scanner and BOLD signal reactivity (absolute value of change between adjacent blocks in the BOLD signal) was examined in specific MVN regions. Significant negative correlations were observed between rHRV and average BOLD shift magnitude (BSM) in several MVN regions in healthy subjects but not depressed subjects. This preliminary report provides novel evidence relating emotional reactivity in MVN regions to rHRV. It also provides preliminary suggestive evidence that depression may involve reduced interaction between the MVN and cardiac vagal control.

Short-term overtraining: effects on performance, circulatory responses, and heart rate variability

2000 ◽  
Vol 32 (8) ◽  
pp. 1480-1484 ◽  
Author(s):  
RIKARD HEDELIN ◽  
G??RAN KENTT?? ◽  
URBAN WIKLUND ◽  
PER BJERLE ◽  
KARIN HENRIKSSON-LARS??N
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Short Term
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