Effects of mobile phone radiation on heart rate variability of healthy young subjects

Abstract Study Objectives The present study investigated the hypothesis that subjects with primary sleep bruxism (SB) exhibit masseter and cortical hyperactivities during quiet sleep periods that are associated with a high frequency of rhythmic masticatory muscle activity (RMMA). Methods Fifteen SB and ten control participants underwent polysomnographic recordings. The frequencies of oromotor events and arousals and the percentage of arousals with oromotor events were assessed. Masseter muscle tone during sleep was quantified using a cluster analysis. Electroencephalography power and heart rate variability were quantified and then compared between the two groups and among sleep stages. Results The frequency of RMMA and percentage of arousals with RMMA were significantly higher in SB subjects than in controls in all stages, while these variables for non-rhythmic oromotor events did not significantly differ between the groups. In SB subjects, the frequency of RMMA was the highest in stage N1 and the lowest in stages N3 and R, while the percentage of arousals with RMMA was higher in stage N3 than stages N1 and R. The cluster analysis classified masseter activity during sleep into two clusters for masseter tone and contractions. Masseter muscle tone showed typical stage-dependent changes in both groups, but did not significantly differ between the groups. Furthermore, no significant differences were observed in electroencephalography power or heart rate variability between the groups. Conclusion Young SB subjects exhibited sleep stage-dependent increases in the responsiveness of RMMA to transient arousals, but did not show masseter or cortical hyperactivity during sleep.

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Dynamics of heart rate variability analysed through nonlinear and linear dynamics is already impaired in young type 1 diabetic subjects

Cardiology in the Young ◽

10.1017/s104795111500270x ◽

2016 ◽

Vol 26 (7) ◽

pp. 1383-1390 ◽

Cited By ~ 3

Author(s):

Naiara M. Souza ◽

Thais R. Giacon ◽

Francis L. Pacagnelli ◽

Marianne P. C. R. Barbosa ◽

Vitor E. Valenti ◽

...

Keyword(s):

Diabetes Mellitus ◽

Heart Rate ◽

Heart Rate Variability ◽

Type 1 Diabetes ◽

Nervous System ◽

Autonomic Nervous System ◽

Type 1 Diabetes Mellitus ◽

Autonomic Nervous ◽

Young Subjects

AbstractBackgroundAutonomic diabetic neuropathy is one of the most common complications of type 1 diabetes mellitus, and studies using heart rate variability to investigate these individuals have shown inconclusive results regarding autonomic nervous system activation.AimsTo investigate the dynamics of heart rate in young subjects with type 1 diabetes mellitus through nonlinear and linear methods of heart rate variability.MethodsWe evaluated 20 subjects with type 1 diabetes mellitus and 23 healthy control subjects. We obtained the following nonlinear indices from the recurrence plot: recurrence rate (REC), determinism (DET), and Shanon entropy (ES), and we analysed indices in the frequency (LF and HF in ms2 and normalised units – nu – and LF/HF ratio) and time domains (SDNN and RMSSD), through analysis of 1000 R–R intervals, captured by a heart rate monitor.ResultsThere were reduced values (p<0.05) for individuals with type 1 diabetes mellitus compared with healthy subjects in the following indices: DET, REC, ES, RMSSD, SDNN, LF (ms2), and HF (ms2). In relation to the recurrence plot, subjects with type 1 diabetes mellitus demonstrated lower recurrence and greater variation in their plot, inter-group and intra-group, respectively.ConclusionYoung subjects with type 1 diabetes mellitus have autonomic nervous system behaviour that tends to randomness compared with healthy young subjects. Moreover, this behaviour is related to reduced sympathetic and parasympathetic activity of the autonomic nervous system.

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Analysis of the mobile phone effect on the heart rate variability by the calculation of correlation dimension

2009 14th National Biomedical Engineering Meeting ◽

10.1109/biyomut.2009.5130290 ◽

2009 ◽

Cited By ~ 1

Author(s):

Derya Yilmaz ◽

Metin Yildiz

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Mobile Phone ◽

Correlation Dimension

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Effects of increased training load on vagal-related indexes of heart rate variability: a novel sleep approach

AJP Heart and Circulatory Physiology ◽

10.1152/ajpheart.00490.2004 ◽

2004 ◽

Vol 287 (6) ◽

pp. H2813-H2818 ◽

Cited By ~ 53

Author(s):

M. Buchheit ◽

C. Simon ◽

F. Piquard ◽

J. Ehrhart ◽

G. Brandenberger

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Slow Wave Sleep ◽

Training Load ◽

Vagal Activity ◽

Lower Heart Rate ◽

Sleep Parameters ◽

Recording Conditions ◽

Young Subjects ◽

Better Than

There is little doubt that moderate training improves cardiac vagal activity and thus has a cardioprotective effect against lethal arrhythmias. Our purpose was to learn whether a higher training load would further increase this beneficial effect. Cardiac autonomic control was inferred from heart rate variability (HRV) and analyzed in three groups of young subjects (24.5 ± 3.0 yr) with different training states in a period free of stressful stimuli or overload. HRV was analyzed in 5-min segments during slow-wave sleep (SWS, a parasympathetic state that offers high electrocardiographic stationarity) and compared with data collected during quiet waking periods in the morning. Sleep parameters, fatigue, and stress levels checked by questionnaire were identical for all three groups with no signs of overtraining in the highly trained (HT) participants. During SWS, a significant ( P < 0.05) increase in absolute and normalized vagal-related HRV indexes was observed in moderately trained (MT) individuals compared with sedentary (Sed) subjects; this increase did not persist in HT athletes. During waking periods, most of the absolute HRV indexes indistinctly increased in MT individuals compared with controls ( P < 0.05) but did not increase in HT athletes. Normalized spectral HRV indexes did not change significantly among the three groups. Heart rate was similar for MT and Sed subjects but was significantly ( P < 0.05) lower in HT athletes under both recording conditions. These results indicate that SWS discriminates the state of sympathovagal balance better than waking periods. A moderate training load is sufficient to increase vagal-related HRV indexes. However, in HT individuals, despite lower heart rate, vagal-related HRV indexes return to Sed values even in the absence of competition, fatigue, or overload.

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