under what conditions does heart rate change?

Found inside – Page 233They recorded heart rate changes following gentle air blasts to the abdomen. When the resting heart rate was at the high extreme of ... Found inside – Page 29The literature therefore does indicate that , when an increase in air temperature causes change in pulse rate , the result is a decrease and on this evidence Findlay ( 1950 ) suggested that , in contrast to man , increasing the blood flow and ... Found inside – Page 59Heart rate.-a. When an individual ascends passively to 14,000 feet , for example , the rate of the heart does not increase immediately . Found inside – Page 387The augmentation of coronary inflow is frequently accompanied by simultaneous elevation of aortic blood pressure and / or heart rate . However , observations that the inflow increases when these variables either do not increase ... Found inside – Page 492These mean increases over the entire tilt for the five subjects are given in Table I and are not significantly different between conditions . TABLE I. MEAN CHANGES IN BLOOD PRESSURE ( mm . Hg ) AND HEART RATE ( BEATS / MIN ) WHEN ... Found inside – Page 239... pressure did not change until CSF pressures reached 100-200mm Hg , with increase in aortic , pulmonary and arterial wedge and right atrial pressures , as well as increase in cardiac output , heart rate and stoke volume . Under conditions of ... Found inside – Page 81For example, we know that the skin conductance of most people increases markedly under conditions of psychological stress. Experimenters have studied such changes, as well as heart rate, tension in the muscles, blood flow in various parts of the body, and brain ... Once the person has adapted to having electrodes pasted on the arm, for example, measurement of heart rate does not interfere with many ... This is a short reference on the physiologic benefits, instrumentation, application and interpretation of fetalheart rate monitoring. Found inside – Page 180in cardiac output per beat up to five - fold ( Mc stroke - volume and , therefore , to a slight systolic Michael and Sharpey - Schafer , 1944 ) . residue ; this residue added to the ... with However , under conditions of maintained ve exercise , the stroke - output may greatly increase , nous pressure , the decreasing diastolic time does yet the diastolic volume of the heart may be no not reduce cardiac filling since ... Found inside – Page 296One of the channels records the fetal heart rate , whereas the second channel records the uterine contractions . ... because the same pattern can appear quite different when the chart speed or signal amplitude is changed . as well as the ... Found inside – Page 68Some murmurs are functional and do not seriously interfere with operation of the heart . Heartbeat and ... Any increase in heart rate is made at the expense of the rest time , thus increasing the demands on the heart muscle . ... Under conditions of rest , an average SV is about 75 milliliters , and the average heart rate is about 72 , resulting in an average MV of ( 75 x 72 ) 5 , 400 milliliters of blood , 5 . 4 liters ... Found inside – Page 370Under conditions of morphin anesthesia ( 0.5 mg / kg ) both with adding a tropin ( 0.03 mg / kg ) and without it ( Fig.2 ) direct ... Heart rate varies slightly in inverse dependence on av independently on its initial value . researches on human beings ( cited by Guyton ( 4 ) ) . ... it is realized by means of pumping heart capacity ( coefficient a ) changes , while total peripheral resistance almost does not change . Found inside – Page 24MEAL FREQUENCY AND ISCHAEMIC HEART - DISEASE 1133 men , aged 60-64 , were grouped according to the ... researcher described “ extraordinary " heart rate changes recorded when both healthy drivers and heart patients drove ... Found inside – Page 163in the latter a moderate increase of certain lipid fractions , especially cholesterol and prebeta lipoproteins , are more frequently encountered . ... Thus , the present study does not show any relation between the intracardiac second component of the first heart sound ... 1973 34/6 ( 795-798 ) Heart rate to 40 sec of apnea was monitored under conditions which would selectively alter alveolar po and pco 163. Found inside – Page 971Heart Rate Response to Square Wave Breathing: One G Compared to Zero G Philip C. Richardson, Ashley J. Welch ... A transient change in beat-by-beat heart rate occurs in the human when sudden inspiratory or expiratory efforts are effected. ... The opinions expressed do not necessarily reflect those of the U. S. Air Force. Found insideOver the last decades, assessment of heart rate variability (HRV) has increased in various fields of research. Do or Die explains how to get out of denial and discover the inspiration and willpower to create life-changing renewal and a healthy lifestyle. Do or Die reviews seven midlife chronic conditions that reduce life expectancy and life quality. Found inside – Page 576 - 8 Three pressure - volume loops under three different preload conditions are shown in Figure 6 – 2 . ... These conditions do not apply precisely in vivo . It is rare that isolated changes in preload , afterload , contractile state , or heart rate occur , because these changes are usually a response to , or in themselves result in ... Found inside – Page 320Brener, J., and Hothersall, D. Heart rate control under conditions of augmented sensory feedback. ... Headrick, M. W. , Feather, B. W., and Wells, D. T. Undirectional and large magnitude heart rate changes with augmented sensory feedback. Found inside – Page 307POSITIVE FEEDBACK LOW | HIGH EXTRAVERTS INTROVERTS EXTRAVERTS HEART RATE CHANGE LOW HIGH POSITIVE ... Apparently , nonneutral ratings of annoyance under conditions of high positive feedback are indicators of noise ... Found inside – Page 36Parallel heart rate changes occurred in the response to the CS and in the response to the stimulation of the cardiac nerves . ... Not only did the dog show a reversal when the vagus was stimulated , but it was also the only dog whose heart rate acceleration to the CS did ... Operantly conditioned heart rate responses do occur independently of overt movement , and these responses would probably be seen ... The relationship that exists between heart rate and respiration rate was investigated. Found inside – Page 30Estimates of quality for success and failure conditions do not differ until success and failure levels are quite high. ... decisions which were strategically related (a second decision was planned for the future when an original decision was planned ... The study was designed to assess the relationship between detection efficiency and beat-to-beat changes in heart rate around task stimuli in a vigilance task. Found insideThe majority of these investigations were made on the frog's heart , but under conditions which are never to be found in vivo , in ... Since these conditions do not correspond to the physiological conditions the conclusions drawn from these experiments cannot be entirely convincing . ... by the effect produced on the nervous system , which might change the heart rate , with a resulting change in the output . This practical book provides a concise tutorial of all the essential aspects of cardiovascular hemodynamics and the techniques used to assess cardiovascular performance. Found inside – Page 191No drugs caused a significant change in Mg . This study demonstrates that B agonists administered by nebuliser do not ... F , under conditions of normoxia significantly increased heart rate ( HR ) , prolonged the QTc interval on the ECG and ... Found inside – Page 68ventilation under normoxic aquatic conditions, with a coupling of ventilation ... There is no significant change in heart rate in G. cobitis under hyperoxia ... Found inside... differences in previously expressed fear of a specific stress condition related to heart rate change and performance impairment under this stressor . Found inside – Page 240These medications do not always interfere with sudomotor responses, ... When testing heart rate variability to deep breathing, if the patient does not take ... Found inside – Page 4636tolic blood pressure response to graded bicycle ergometry : ( 1 ) greatest change in systolic blood pressure during ... of the linear regression of exercise elicited changes in systolic blood pressure on concurrent changes in heart rate ( SLOPE ) . ... reactions among EX + reactors ( SBPMAX , SBP100 , SBPMEAN ) when change scores were collapsed across tasks . ... the hippocampus appears to be necessary for tasks which require learning complex rules , but does not appear to be ... Found inside – Page iThis book reviews the research pertaining to nutrient requirements for working in cold or in high-altitude environments and states recommendations regarding the application of this information to military operational rations. Found inside – Page 256The 24-hr cycle in I, although more apparent in 8-day-old than in 25-day-old animals, could not account for these increases. ... The correlation of these biochemical changes and histological observations is discussed. II. ... This is the time when food deprivation seemed to be most effective in controlling levels of RNase through regulation of its inhibitor. ... The basa cell areas show desmosomes or hemidesmosomes. suggesting tha these cells do not originate from the epithelium. In aviation occupations, performance impairment under stress conditions is particularly undesirable. This book summarizes recent advances in the field; it is the product of fruitful cooperation among international scientists who met in Japan in May, 1990 to discuss the regulation of coronary blood flow. Found inside – Page 672When we were recording tion on breathing as well as heart rate was breathing movements and ECG , submergence ... Marked changes in the weather conditions , although freMethods quently disturbing to the operators , appeared to be of ... Found inside – Page 3115 ) that Lombard and Cope's formula holds fairly accurately in dogs whose heart rate is less than 150 per minute . ... 5 , where the actual systole - cycle ratios of several dogs under standard conditions were compared with the ratio calculated ... The plot shows that the actual results do not agree with the ratio calculated from his curve , making it obvious that the ... ( a ) Relation During Changing Heart Rate : It is interesting to further determine how the duration of systole and diastole alter ... Found inside – Page 117Introduction We learn from the daily press that young school teachers are under stress when dealing with fractious ... upset if its beat did not vary , since there are perfectly reasonable mechanisms which are intended to ensure that it does so . Found inside – Page 78Baseline cularly if fresh ( when it has a bright green colour ) , or heart rate variability , which is a close approximation to when it ... may be discerned from the change in rate with each breech presentation ) , or when thick and associated with beat recorded by the pen of the chart recorder . ... heart block , and occasionally occurs The effect on the FHR does not reach its maximum until in the postterm fetus . Ideal for cardiologists who need to keep abreast of rapidly changing scientific foundations, clinical research results, and evidence-based medicine, Braunwald’s Heart Disease is your indispensable source for definitive, state-of-the-art ... Found inside – Page 258With the A B exception of the inotropic agent , the changes in pressure and stroke volume do not reflect changes in intrinsic cardiac function . ... + 1 / Ees ) , where I is the duration of the cardiac cycle ( i.e. , T = 60 / HR ) , HR is heart rate , and EDV is end - diastolic volume . ... When compared with the baseline pressure - volume loop , the loop obtained with increased TPR ( but a similar preload volume ) ... Found inside – Page 33Because one does not catch a fish every time a line is cast into the water , fishing behavior is usually encouraged by ... For example , a shy young girl was deliberately ignored by her teachers when she played alone but flattered with their ... Sometimes , but not always , people who monitor their own heart rate or blood presbiofeedback sure can change it by using the principles of 40 Review a When a ... New editor William G. Stevenson, highly regarded in the EP community, brings a fresh perspective to this award-winning text. Found inside – Page 102Peak H1 indicates the heart rate crease in CBF and CVC is dramatically vari - related frequency component and H2 is the ... The averaged BF pulse from the effect may account for some of the increase in same animal under the same conditions and at CBF . ... This may indicate that a local ability does not occur in the ear contralateral to vascular response in the cochlea has occurred . the stimulation . Found inside – Page 229no - incentive subjects in maintaining slowing performance when feedback was removed . ... When instructed to slow heart rate , information frequency had no effect on the amount of heart rate change . ... that a heart - time display can facilitate speeding in systematic ways while a real - time feedback of heart rate does not . Found inside – Page 1141110 A 100 Hypoxia Hyperoxia 90 130 А # 120 110 HR ( bpm ) 80 100 70 # 90 Hypoxia Hyperoxia 60 Condition Effect : P ... In humans , MSNA does not increase when Pet CO2 is elevated only 5 mmHg above eucapnia ( Shoemaker et al . Found inside – Page 36219 - 10 When cardiac output is suddenly increased , the arterial compliance ( Ca ) determines the rate at which the ... It does not matter whether changes in cardiac output are accomplished by an alteration of heart rate , stroke volume , or both . Found inside – Page 19When multiple measures are not employed , researchers should at least keep a record of yowns , coughs , vocalizations , cries , and laughs of the infant so that in some cases artifactual heart rate changes can be excluded . ( See Sroufe ... Found inside – Page 401BRIEF COMMUNICATIONS CHANGES IN THE HEART RATE DURING MENTAL WORK OF INCREASING INTENSITY T. N. ... rate of correct work ) and when the task fell outside these limits , and the subjects were working under conditions ... Between heart rate change and performance impairment under this stressor HRV ) has increased in various fields of.... Across tasks across tasks the correlation of these biochemical changes and histological observations is.. Volume loop, the rate of the increase in same animal under the same and. 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