Physiological Measurement REPLY Reply to ‘Comment on Photoplethysmography sampling frequency: pilot assessment of how low can we go to analyze pulse rate variability with reliability?’ To cite this article: Ahyoung Choi and Hangsik Shin 2017 Physiol. Meas. 38 2252 View the article online for updates and enhancements. Related content Photoplethysmography sampling frequency: pilot assessment of how low can we go to analyze pulse rate variability with reliability? A Choi and H Shin - Comment on ‘Photoplethysmography sampling frequency: pilot assessment of how low can we go to analyze pulse rate variability with reliability?’ László Hejjel - Interchangeability between heart rate and photoplethysmography variabilities during sympathetic stimulations K Charlot, J Cornolo, J V Brugniaux et al. - This content was downloaded from IP address 172.245.220.218 on 05/10/2019 at 12:37