Heart rates of white-tailed deer fawns in response to recorded wolf howls

1978 ◽  
Vol 56 (5) ◽  
pp. 1207-1210 ◽  
Author(s):  
Aaron N. Moen ◽  
M. A. DellaFera ◽  
A. L. Hiller ◽  
B. A. Buxton
Keyword(s):  
Heart Rate ◽  
Heart Rate Response ◽  
Initial Response ◽  
Adaptive Strategy ◽  
Sign Test ◽  
Heart Rates

Weekly measurements of heart rate responses of a hand-reared white-tailed deer fawn to recorded wolf howls were completed through the age of 87 days, with occasional measurements of the responses of three other fawns. Alarm bradycardia was a very predictable initial response to the first howl through 45 days of age. Increased heart rates were observed in response to a chorus of howls 35 s into the 62-s sequence. A most interesting characteristic of the response was a highly significant (sign test) relationship between the direction of the heart rate response at 1-s intervals from one test to another, and from one week to the next, until the fawn was 45 days old. Heart rates varied from 86 to 225 beats per minute during the tests, within the ranges observed for transient stimuli such as horses, rain, machines, and other deer. The fawn remained bedded during the tests. A hiding response and alarm bradycardia in the first few weeks of life seems to be good adaptive strategy as the neonate has little chance to escape from a predator by running.

Anticipatory, exercise, and recovery heart rates of girls as affected by four running events

1964 ◽  
Vol 19 (5) ◽  
pp. 853-856 ◽  
Author(s):  
Vera Skubic ◽  
Jane Hilgendorf
Keyword(s):  
Heart Rate ◽  
Cardiac Function ◽  
Heart Rate Response ◽  
Heart Rates

The heart rate response to running various distances was studied using five highly trained girls as subjects. A telemetering instrument was employed so that the testing could be done under actual sport conditions. The findings indicated that 1) the anticipatory heart rate just prior to exercise represented 59% of the total adjustment to exercise, 2) the heart rates during exercise were 2.5 times the resting values, and 3) heart rates observed at the end of the 220-, 440-, 880-yard, and mile events were simila cardiac function; exercise Submitted on October 22, 1963

Specificity of Training as Indicated by Heart-Rate Response to Exercise

1973 ◽  
Vol 36 (2) ◽  
pp. 639-645 ◽  
Author(s):  
G. Harley Hartung
Keyword(s):  
Heart Rate ◽  
Endurance Training ◽  
Heart Rate Response ◽  
Specific Work ◽  
Distance Runners ◽  
Heart Rates ◽  
Significant Difference ◽  
Response To Exercise ◽  
Specificity Of Training ◽  
Better Than

Heart rates of 30 male Ss were monitored prior to, during, and in recovery from a standard treadmill walk. 10 Ss were trained distance runners and were considered trained in the specific work studied. 10 Ss were conditioned swimmers but were doing a type of work for which they were not trained. The runners had significantly better mean endurance times (time to heart rates 110, 130, 150, and 170) than the swimmers, even though both had previously undergone extensive endurance training. The swimmers did not perform significantly better than a group of nontrained Ss except to heart rate 130. In recovery to heart rate 130, there was no significant difference among the means of the three groups. The only significant difference among group means to final recovery heart rate was between the runners and the nontrained group.

Heart-Rate Response during Aversive Conditioning

1970 ◽  
Vol 27 (2) ◽  
pp. 651-658 ◽  
Author(s):  
Terry L. De Vietti ◽  
Paul B. Porter
Keyword(s):  
Heart Rate ◽  
Heart Rate Response ◽  
Aversive Conditioning ◽  
Specific Training ◽  
Heart Rates

36 rats were used to determine the effects of: (a) footshock before specific training, (b) CS duration (6 vs 60 sec.), and (c) form of aversive conditioning (CER vs CAR) on heart rate both during the presentation of the CS and between presentations. All three tested variables were effective in modifying the heart-rate response to the CS while only CS duration altered heart rates between CS presentations.

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

scholarly journals Heart Rate–Induced Myocardial Ca 2+ Retention and Left Ventricular Volume Loss in Patients With Heart Failure With Preserved Ejection Fraction

2020 ◽  
Vol 9 (17) ◽  
Author(s):  
Daniel N. Silverman ◽  
Mehdi Rambod ◽  
Daniel L. Lustgarten ◽  
Robert Lobel ◽  
Martin M. LeWinter ◽  
...  
Keyword(s):  
Heart Failure ◽  
Heart Rate ◽  
Ejection Fraction ◽  
Sinus Rhythm ◽  
Left Ventricular ◽  
Atrial Pacing ◽  
Preserved Ejection Fraction ◽  
Volume Loss ◽  
Heart Rates ◽  
Patients With Heart Failure

Background Increases in heart rate are thought to result in incomplete left ventricular (LV) relaxation and elevated filling pressures in patients with heart failure with preserved ejection fraction (HFpEF). Experimental studies in isolated human myocardium have suggested that incomplete relaxation is a result of cellular Ca 2+ overload caused by increased myocardial Na + levels. We tested these heart rate paradigms in patients with HFpEF and referent controls without hypertension. Methods and Results In 22 fully sedated and instrumented patients (12 controls and 10 patients with HFpEF) in sinus rhythm with a preserved ejection fraction (≥50%) we assessed left‐sided filling pressures and volumes in sinus rhythm and with atrial pacing (95 beats per minute and 125 beats per minute) before atrial fibrillation ablation. Coronary sinus blood samples and flow measurements were also obtained. Seven women and 15 men were studied (aged 59±10 years, ejection fraction 61%±4%). Patients with HFpEF had a history of hypertension, dyspnea on exertion, concentric LV remodeling and a dilated left atrium, whereas controls did not. Pacing at 125 beats per minute lowered the mean LV end‐diastolic pressure in both groups (controls −4.3±4.1 mm Hg versus patients with HFpEF −8.5±6.0 mm Hg, P =0.08). Pacing also reduced LV end‐diastolic volumes. The volume loss was about twice as much in the HFpEF group (controls −15%±14% versus patients with HFpEF −32%±11%, P =0.009). Coronary venous [Ca 2+ ] increased after pacing at 125 beats per minute in patients with HFpEF but not in controls. [Na + ] did not change. Conclusions Higher resting heart rates are associated with lower filling pressures in patients with and without HFpEF. Incomplete relaxation and LV filling at high heart rates lead to a reduction in LV volumes that is more pronounced in patients with HFpEF and may be associated with myocardial Ca 2+ retention.

scholarly journals Genetic and Environmental Sources of Variation in Heart Rate Response to Infused Nicotine in Twins

2007 ◽  
Vol 16 (6) ◽  
pp. 1057-1064 ◽  
Author(s):  
Gary E. Swan ◽  
Christina N. Lessov-Schlaggar ◽  
Ruth E. Krasnow ◽  
Kirk C. Wilhelmsen ◽  
Peyton Jacob ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Response ◽  
Sources Of Variation
Sign in / Sign up

Export Citation Format

Share Document