Visual heart rate estimation and negative feedback control for fitness exercise

2020 ◽  
Vol 56 ◽  
pp. 101680 ◽  
Author(s):  
Changchen Zhao ◽  
Chun-Liang Lin ◽  
Weihai Chen ◽  
Ming-Kun Chen ◽  
Jianhua Wang
Keyword(s):  
Heart Rate ◽  
Feedback Control ◽  
Negative Feedback ◽  
Rate Estimation ◽  
Negative Feedback Control ◽  
Heart Rate Estimation

Sinoaortic denervation abolishes pressure resetting for daily physical activity in rabbits

2002 ◽  
Vol 282 (3) ◽  
pp. R649-R657 ◽  
Author(s):  
Yasuhiro Nishida ◽  
Qing Hui Chen ◽  
Ming-Sheng Zhou ◽  
Jouji Horiuchi
Keyword(s):  
Physical Activity ◽  
Heart Rate ◽  
Feedback Control ◽  
Negative Feedback ◽  
Peripheral Resistance ◽  
Pressure Level ◽  
Daily Physical Activity ◽  
Shift Map ◽  
Negative Feedback Control ◽  
Map Data

It has been speculated that if baroafferent signals are only related to the negative feedback control of arterial pressure (AP), then physical activity would increase the range of AP fluctuation in baroafferent-denervated animals. Mean AP (MAP), heart rate (HR), and cardiac output (CO) were measured for 24 h in free-moving conscious rabbits. On the basis of hydrostatic pressure and electromyogram, MAP data taken during periods of physical activity and rest were selected from the overall 24-h MAP data and then converted into histograms. During physical activity, the mode of MAP histogram increased in intact rabbits and was unchanged in sinoaortic-denervated (SAD) rabbits. Movement increased the mode of total peripheral resistance (TPR) but did not significantly change CO in intact rabbits. Conversely in SAD rabbits, movement slightly decreased TPR and slightly increased CO. These findings indicate that arterial baroafferent signals are required to shift MAP to a higher pressure level by an increase in TPR but not in CO during a moving phase. These results suggest that baroafferent signals may not only minimize the fluctuating range of MAP through negative feedback control but also be involved in actively resetting MAP toward a higher pressure level during daily physical activity.

scholarly journals A 172 $\mu$W Compressively Sampled Photoplethysmographic (PPG) Readout ASIC With Heart Rate Estimation Directly From Compressively Sampled Data

2017 ◽  
Vol 11 (3) ◽  
pp. 487-496 ◽  
Author(s):  
Venkata Rajesh Pamula ◽  
Jose Manuel Valero-Sarmiento ◽  
Long Yan ◽  
Alper Bozkurt ◽  
Chris Van Hoof ◽  
...  
Keyword(s):  
Heart Rate ◽  
Sampled Data ◽  
Rate Estimation ◽  
Heart Rate Estimation
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