scholarly journals Dynamic Modelling of Heart Rate Response Under Different Exercise Intensity

2010 ◽  
Vol 4 (1) ◽  
pp. 81-85 ◽  
Author(s):  
Steven W Su ◽  
Weidong Chen ◽  
Dongdong Liu ◽  
Yi Fang ◽  
Weijun Kuang ◽  
...  
Keyword(s):  
Heart Rate ◽  
Time Constant ◽  
Heart Rate Response ◽  
Cardiovascular Response ◽  
Dynamic Modelling ◽  
Healthy Male Subject ◽  
Step Response ◽  
Rate Variation ◽  
Response Dynamics ◽  
Non Invasive

Heart rate is one of the major indications of human cardiovascular response to exercises. This study investigates human heart rate response dynamics to moderate exercise. A healthy male subject has been asked to walk on a motorised treadmill under a predefined exercise protocol. ECG, body movements, and oxygen saturation (SpO2) have been reliably monitored and recorded by using non-invasive portable sensors. To reduce heart rate variation caused by the influence of various internal or external factors, the designed step response protocol has been repeated three times. Experimental results show that both steady state gain and time constant of heart rate response are not invariant when walking speed is faster than 3 miles/hour, and time constant of offset exercise is noticeably longer than that of onset exercise.

Differences in heart rate response at feeding between stall housed and group housed sows

1993 ◽  
Vol 1993 ◽  
pp. 17-17
Author(s):  
J.N. Marchant ◽  
A.R.Rudd
Keyword(s):  
Heart Rate ◽  
Small Groups ◽  
Heart Rate Response ◽  
Housing Conditions ◽  
Farm Animal Welfare ◽  
Heart Rate Monitor ◽  
Heart Rate Monitors ◽  
Non Invasive ◽  
Applied Physiology ◽  
Improved Technology

The scientific assessment of farm animal welfare requires an amalgam of different measures of both physiology and behaviour. Behavioural measures are relatively easy to obtain but non-invasive measures of internal physiology are somewhat harder to achieve. An increase in the use of applied physiology in training regimes of human athletes, has led to an improved technology of heart rate monitors, making the measurement of heart rates painless and easy to record.The objective of this experiment was to use a human heart rate monitor to investigate differences in heart rate response at feeding between sows housed in three different dry sow housing conditions. Schouten et al (1991) have demonstrated differences in heart rate response at feeding between loose-housed and tethered sows. In the study reported here, stall-housed sows were compared with sows housed in small groups and sows housed in a large group with an Electronic Feeder System (EFS).

NON-INVASIVE ESTIMATION OF THE LACTATE THRESHOLD FROM HEART RATE RESPONSE TO SUBMAXIMAL EXERCISE

1992 ◽  
Vol 24 (Supplement) ◽  
pp. S166
Author(s):  
J. C. Gonzalez ◽  
A. Oliveira ◽  
F. Cheaello ◽  
E. Grassi ◽  
J. P. Hiboiro
Keyword(s):  
Heart Rate ◽  
Lactate Threshold ◽  
Heart Rate Response ◽  
Submaximal Exercise ◽  
Non Invasive

Autonomic mechanisms in the initial heart rate response to standing

1980 ◽  
Vol 49 (5) ◽  
pp. 809-814 ◽  
Author(s):  
D. J. Ewing ◽  
L. Hume ◽  
I. W. Campbell ◽  
A. Murray ◽  
J. M. Neilson ◽  
...  
Keyword(s):  
Heart Rate ◽  
Response Pattern ◽  
Heart Rate Response ◽  
Muscular Activity ◽  
Normal Subjects ◽  
Quiet Standing ◽  
Rate Variation ◽  
Normal Pattern ◽  
Vagal Control ◽  
Standing Up

Autonomic mechanisms underlying the initial heart rate response to standing were analyzed in nine normal subjects. The normal pattern of response was altered by atropine to a small and gradual R-R interval shortening over 30 beats, with no rebound R-R interval lengthening. With additional propranolol, R-R interval shortening was even less and confined to the first 15-20 beats, whereas propranolol alone did not affect the normal response pattern, showing that this is under vagal control with increased cardiac sympathetic activity occurring only if the vagus is blocked. The response was reproducible in 23 normal subjects. Heart rate variation during quiet standing was almost completely abolished by atropine, but unaffected by propranolol, confirming that it is also under vagal control. In four normal subjects no rebound R-R interval lengthening occurred during either "fast" or "slow" tilt, whereas it was present during both "slow" and "fast" standing. The rebound R-R interval lengthening is determined by the muscular activity involved in standing up, rather than by the speed of the maneuver.

The discriminative control of a conditioned heart rate response.

1957 ◽  
Author(s):  
Philip J. Bersh ◽  
Joseph M. Notterman ◽  
William N. Schoenfeld
Keyword(s):  
Heart Rate ◽  
Heart Rate Response ◽  
Discriminative Control ◽  
Conditioned Heart Rate

Effect of human galanin on the response of circulating catecholamines to hypoglycemia in man

1995 ◽  
Vol 133 (6) ◽  
pp. 723-728 ◽  
Author(s):  
Ettore C degli Uberti ◽  
Maria R Ambrosio ◽  
Marta Bondanelli ◽  
Giorgio Transforini ◽  
Alberto Valentini ◽  
...  
Keyword(s):  
Heart Rate ◽  
Healthy Subjects ◽  
Sympathetic Nerve Activity ◽  
Heart Rate Response ◽  
Statistical Significance ◽  
Inhibitory Effect ◽  
Amino Acid Residues ◽  
Nerve Activity ◽  
Receptor Stimulation

degli Uberti EC, Ambrosio MR, Bondanelli M, Trasforini G, Valentini A, Rossi R, Margutti A, Campo M. Effect of human galanin on the response of circulating catecholamines to hypoglycemia in man. Eur J Endocrinol 1995;133:723–8. ISSN 0804–4643 Human galanin (hGAL) is a neuropeptide with 30 amino acid residues that has been found in the peripheral and central nervous system, where it often co-exists with catecholamines. In order to clarify the possible role of hGAL in the regulation of sympathoadrenomedullary function, the effect of a 60 min infusion of hGAL (80 pmol·kg−1 · min−1) on plasma epinephrine and norepinephrine responses to insulin-induced hypoglycemia in nine healthy subjects was investigated. Human GAL administration significantly reduced both the release of basal norepinephrine and the response to insulin-induced hypoglycemia, whereas it attenuated the epinephrine response by 26%, with the hGAL-induced decrease in epinephrine release failing to achieve statistical significance. Human GAL significantly increased the heart rate in resting conditions and clearly exaggerated the heart rate response to insulin-induced hypoglycemia, whereas it had no effect on the blood pressure. We conclude that GAL receptor stimulation exerts an inhibitory effect on basal and insulin-induced hypoglycemia-stimulated release of norepinephrine. These findings provide further evidence that GAL may modulate sympathetic nerve activity in man but that it does not play an important role in the regulation of adrenal medullary function. Ettore C degli Uberti, Chair of Endocrinology, University of Ferrara, Via Savonarola 9, I-44100 Ferrara, Italy

Calculation of Heart Rate Variation Owing to the Effect of Electromagnetic Fields Waves (EMF)

2018 ◽  
Vol 10 (2) ◽  
pp. 48-53 ◽  
Author(s):  
Mohammed Yahya H. ◽  
◽  
Ali Adil Turki ◽  
Ali H. F. Alnasraui ◽  
Qasim shaker K ◽  
...  
Keyword(s):  
Heart Rate ◽  
Electromagnetic Fields ◽  
Rate Variation ◽  
Heart Rate Variation
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