4 Research on the change of heart rate variability under strong noise stimulation

• Published in: Journal of investigative medicine Vol. 67; no. Suppl 1; p. A2
• Main Authors: Lu, L, Zhuang, HW, Zhang, YL
• Format: Journal Article
• Language: English
• Published: London Sage Publications Ltd 01-03-2019
• Subjects: Ears & hearing; Heart rate; Noise; Physiology
• ISSN: 1081-5589; 1708-8267
• DOI: 10.1136/jim-2019-000994.4

ObjectiveTo investigate the effect of different strong noise stimuli on heart rate variability (HRV) in 5 min.Methods120 students aged 19–22 years with no diseases were selected; they had not done strenuous exercise within 24 hours. The subjects were divided into four groups of 30 people. Each group was stimulated by white noise for 5 min as follows: group A 105 dB, group B 100 dB, group C 115 dB, group D was the control group. A 1 hour ambulatory ECG was conducted in the four groups. The 5 min average HR, SDNN, PNN50, HF, LF and VLF were measured or calculated.ResultsThe levels of SDNN, PNN50, LF and VLF of groups A, B and C were significantly lower than those in the control group, while HR was significantly higher than that in the control group (p<0.05). For PNN50, LF and VLF, group C had the lowest values and group A had the highest values.ConclusionHRV of people exposed to noise appears blunted significantly, which suggests that long-term and regular exposure to strong noise not only harms the auditory system, but also may result in impairment of cardiac autonomic nerve activity.