Cardiac Autonomic Functions Derived From Short-Term Heart Rate Variability Recordings Associated With Nondiagnostic Results of Treadmill Exercise Testing

Abstract Background : Heart rate variability (HRV) provides an opportunity to capture the tiny but early signs that may predict the future cardiovascular risk in healthy individuals and further, helps understand how well the cardiovascular autonomic system works. Aims of this study were to elucidate short-term recovery of HRV and its relationship with blood pressure recovery after different intensity treadmill exercise. Methods : Fifteen healthy participants performed four different conditions (REST; speed 6km/h; speed 8km/h; speed 10km/h), systolic and diastolic blood pressure per 30s (SBP, DBP) and 5-mins consecutive heart beats intervals were measured after each trial. Autonomic nervous regulation was evaluated using HRV time-frequency domain indices and heart rate asymmetry (HRA) indices. Each index was calculated using 5 mins electrocardiogram (ECG) series and consecutive 30-s windows in 5 mins. Results : the vagally related indices (RMSSD, pNN50 and HF) decreased and the indices representing overall variability (SDNN, LF) had different trends as intensity increasing. The sympathetic-vagal balance parameter LF/HF increased, too. HRV indices had strong correlations with DBP but weak with SBP. Meanwhile, heart rate asymmetry vanished after each trial. Conclusions : The findings suggested a vagal withdrawal as soon as the end of treadmill exercise. It could be concluded that sympathetic modulation was stronger as intensity increasing. During recovery period, DBP was mediated by vagal activation and sympathetic withdrawal. The diminished asymmetry in Poincaré plot was the result of sympathetic acceleration and vagal reduction.

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Early heart rate response during treadmill exercise testing is mainly determined by cardiorespiratory fitness

European Journal of Cardiovascular Prevention & Rehabilitation ◽

10.1097/00149831-200605001-00137 ◽

2006 ◽

Vol 13 (Supplement 1) ◽

pp. S35

Author(s):

A Kalogeropoulos ◽

P Mylona ◽

B Kommata ◽

J Chiladakis ◽

D Alexopoulos

Keyword(s):

Heart Rate ◽

Cardiorespiratory Fitness ◽

Exercise Testing ◽

Heart Rate Response ◽

Treadmill Exercise ◽

Treadmill Exercise Testing

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Comparison between standard short-term, very-short and ultra-short-term heart rate variability analysis in healthy subjects during exercise testing

European Heart Journal ◽

10.1093/eurheartj/eht309.p3384 ◽

2013 ◽

Vol 34 (suppl 1) ◽

pp. P3384-P3384 ◽

Cited By ~ 4

Author(s):

D. Brisinda ◽

A. Venuti ◽

A. R. Sorbo ◽

C. Cataldi ◽

E. Iantorno ◽

...

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Exercise Testing ◽

Healthy Subjects ◽

Heart Rate Variability Analysis ◽

Short Term ◽

Variability Analysis

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CHRONIC OBSTRUCTIVE PULMONARY DISEASE: GRADING OF SEVERITY AS REFLECTED BY SHORT TERM HEART RATE VARIABILITY.

10.36106/ijsr/8431417 ◽

2021 ◽

pp. 51-53

Author(s):

Somsubhra Sarkar ◽

Jayanta Bhattacharya

Keyword(s):

Chronic Obstructive Pulmonary Disease ◽

Heart Rate ◽

Heart Rate Variability ◽

Pulmonary Disease ◽

Chronic Obstructive ◽

Short Term ◽

Autonomic Functions ◽

Obstructive Pulmonary Disease ◽

Copd Patients ◽

Hrv Analysis

Chronic obstructive pulmonary disease (COPD) is a broad spectrum respiratory illness where there are structural and functional changesin the lungs. According to WHO, COPD is a leading global burden and by 2030 it will be the third leading cause of death worldwide. The structural and functional changes in the lungs in COPD patients tend to inuence the cardiac autonomic functions and heart rate variability (HRV). Previousstudiesshow that there is decrease in heart rate variability in COPD patients. In many previousstudies, it isfound that results ofshort term HRV analysis of 5minutes is comparable to standard 24hours HRV analysis and is very patient friendly and reproducible procedure to analyse the cardiac autonomic functions. So determination of parameters of cardiac autonomic functions with the help of short term HRV analysis in COPD patients is helpful in determining the pathophysiology and subsequent management of such patients. A Descriptive and observational study was conducted upon 100 previously diagnosed COPD patients at the Autonomic function research Laboratory, Department of Physiology, R G Kar Medical College and Hospital, Kolkata, West Bengal. The study includes short term (5min) HRV analysis in COPD patients between the age group 18years and 60years after fullling appropriate inclusion and exclusion criteria and the results were analyzed using proper statistical software. After analysis of different data it was found that there is decrease in heart rate variability (in both Time domain and Frequency domain analysis) in case of COPD and also the decrease is more in case of increasing severity grading of COPD. Sympathetic activity increases and vagal or parasympathetic activity upon heart rate decreases with the increase in COPD grading. Further studies with more number of subjects will be helpful in assessing pathophysiology and management of COPD patients with the help of HRV analysis.

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