Related Experiment Video
Updated: Jun 19, 2025
Measuring Cardiac Autonomic Nervous System ANS Activity in Toddlers - Resting and Developmental Challenges
Published on: February 25, 2016
Reliability of an "At-Home" Method for Monitoring Resting and Reactive Autonomic Nervous System Activity in Children:
Rachel Venn1,2, Joseph M Northey1,2, Nenad Naumovski1,2,3,4
1School of Rehabilitation and Exercise Sciences, Faculty of Health, University of Canberra, Canberra, ACT 2617, Australia.
Insights
Home-based heart rate variability (HRV) testing is reliable for assessing autonomic nervous system (ANS) health in children. This study confirms that resting and exercise recovery HRV measures can be accurately monitored at home, offering a new way to track ANS development.
Area of Science:
- Pediatric autonomic nervous system (ANS) function.
- Cardiorespiratory fitness assessment in children.
- Biomedical signal analysis for health monitoring.
Background:
- Heart rate variability (HRV) reflects autonomic nervous system (ANS) status and can detect dysfunction.
- Low vagally-related HRV is linked to increased physical and mental illness risk.
- Environmental factors can influence ANS testing, impacting HRV interpretation.
Purpose of the Study:
- To determine the reliability of at-home resting and reactivity heart rate variability (HRV) tests.
- To assess HRV measures in children aged 4-9 years.
- To establish a reliable method for monitoring ANS health in children remotely.
Main Methods:
- Two home-based HRV tests were conducted 7 days apart with online supervision.
- Participants included 14 healthy children (8 female) aged 6.8 ± 1.5 years.
- Absolute and relative reliability of resting (5 min) and exercise recovery (4 × 30 s segments) HRV were calculated.
Main Results:
- Vagal activity HRV domains showed good-to-excellent relative reliability (r > 0.8) at rest and during recovery.
- Absolute reliability (CV) for resting vagal activity was 5.2%, 10.7% in early recovery, and 8.7% in later recovery.
- Reliability measures indicate consistency in HRV data collected at home.
Conclusions:
- At-home resting and exercise recovery HRV measures of vagal activity are reliable in children.
- This study introduces a novel "at-home" protocol for monitoring children's ANS health.
- Reliable home-based HRV testing can support ongoing assessment of pediatric ANS health and development.
Background:
Heart rate variability (HRV), an index of the functional status of the autonomic nervous system (ANS), provides an opportunity for early detection of ANS dysfunction. Lower resting, vagally related HRV parameters are associated with increased risk of physical and mental illness. External factors influencing the ANS, such as the testing environment, may impact the interpretation of HRV. This study's main aim was to determine the reliability of HRV resting and reactivity tests performed at home with children aged 4-9 years.
Methods:
Fourteen healthy children (female n = 8) aged 6.8 ± 1.5 years participated. Two HRV tests were performed at home via online supervision 7 days apart using a Polar H10 heart rate monitor. The absolute and relative reliability of the pre-exercise resting (5 min) and sub-maximal exercise step test recovery (4 × 30 s segments) HRV time and frequency domains were calculated.
Results:
The Pearson correlation coefficients for day 1 versus day 7 for the vagal activity HRV domains (RMSSD log) at rest and in the first 30 s and 30-60 s of recovery indicated good-to-excellent relative reliability (r > 0.8, p < 0.01). Absolute reliability was moderate for the resting RMSSD log, with a coefficient of variation (CV) of 5.2% (90% CI: 3.9, 7.8%), high for the first 30 s of standing recovery, with a CV of 10.7% (90% CI: 8.2, 15.7%), and moderate for 30-60 s of recovery, with a CV of 8.7% (90% CI: 6.6, 12.9%).
Conclusions:
The findings of this pilot study indicate that the resting and exercise recovery HRV measures of vagal activity can be measured reliably at home in children. This represents a novel "at-home" protocol for monitoring ANS health and development in children.
