Journal of Bioengineering & Biomedical Science

Zaidi SN

Publications

• Research Article
  Orthostatic Stress Induced Changes in Heart Rate Variability, Pulse Transit Time and QRS Duration
  Author(s): Zaidi SN and Collins SMZaidi SN and Collins SM
  
  Studies have shown the application of non-invasive cardiovascular parameters like heart rate variability (HRV), pulse transit time (PTT) and QRS duration. However no information is available about effects of orthostatic stress on these parameters. Our objective was to study the changes in HRV, PTT and QRS duration caused by orthostatic stress. Electrocardiogram (ECG) and photoplethysmogram (PPG) data was collected from 22 subjects in supine and upright positions. Comparison of parameters in supine and upright positions revealed that every parameter was effected by orthostatic stress. High frequency power of HRV showed the largest response (75%), while QRS duration had the smallest response of (7%). We found that gender played a significant role in PTT, R-R interval and QRS duration values, with male subjects showing higher values of all three parameters. Subject height also played a d.. Read More»
  DOI: 10.4172/2155-9538.1000194

  Abstract PDF