Key result
Night-shift work increases sympathetic influences on heart rate variability, though many studies omitted important methodological details such as ECG sampling rates and R-R segment durations.
Why the study?
Night-shift workers may develop poor cardiovascular health, and studies evaluating heart rate variability methodologies are needed to identify risk factors and assess interventions.
Does night-shift work alter heart rate variability metrics in night-shift workers?
Systematic Review
Does night-shift work alter heart rate variability metrics in night-shift workers?
Night-shift work appears to increase sympathetic modulation of heart rate variability, though future studies require better methodological standardization to identify therapeutic targets.
Answers are grounded in this paper and cite their sources.
Night-shift work may increase sympathetic HRV modulation; leaves open need for standardized ECG methods before clinical adoption.
Night-shift workers may develop poor cardiovascular health. Studies about heart rate variability (HRV) metrics could identify risk factors in this population and be used to examine the effectiveness of interventions for optimizing the health of night-shift workers. The purpose of this review was to examine the use of HRV methodologies in studies about night-shift work. Overall, 34 articles met the selection criteria and underwent a methodological critique. The main conclusion across these studies was that night-shift work could increase the sympathetic influences on the variability between heartbeats. In many cases, however, important methodological details were omitted (e.g., the number and duration of electrocardiogram recordings, sampling rates, R-R segment duration, wavelet transform methods). Recommendations include adding measures of disease outcomes, using ≥250 Hz sampling rates and 600-s R-R segments, and measuring sleep and circadian rhythms. With these approaches, researchers can design investigations that identify therapeutic targets for improving the health of night-shift workers. Int J Occup Med Environ Health. 2020;33(4):409-25.
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Anne M. Fink (2020) conducted a systematic review in Cardiac autonomic modulation in night-shift workers. Night-shift work vs. Day-shift work or off-duty periods was evaluated on Heart rate variability (HRV) metrics (frequency-domain and time-domain). Night-shift work increases sympathetic influences on heart rate variability, though many studies omitted important methodological details such as ECG sampling rates and R-R segment durations.
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