scholarly journals Effect of muscle mass and intensity of isometric contraction on heart rate

2000 ◽  
Vol 88 (2) ◽  
pp. 487-492 ◽  
Author(s):  
José M. Gálvez ◽  
Juan P. Alonso ◽  
Luis A. Sangrador ◽  
Gonzalo Navarro
Keyword(s):  
Heart Rate ◽  
Muscle Mass ◽  
Rate Increase ◽  
Isometric Exercise ◽  
Heart Rate Increase ◽  
Maximal Force ◽  
Wheel Turn ◽  
Obese Subjects ◽  
Energetic Expenditure ◽  
Handgrip Contractions

The purpose of this study was to determine the effect of muscle mass and the level of force on the contraction-induced rise in heart rate. We conducted an experimental study in a sample of 28 healthy men between 20 and 30 yr of age (power: 95%, α: 5%). Smokers, obese subjects, and those who performed regular physical activity over a certain amount of energetic expenditure were excluded from the study. The participants exerted two types of isometric contractions: handgrip and turning a 40-cm-diameter wheel. Both were sustained to exhaustion at 20 and 50% of maximal force. Twenty-five subjects finished the experiment. Heart rate increased a mean of 15.1 beats/min [95% confidence interval (CI): 5.5–24.6] from 20 to 50% handgrip contractions, and 20.7 beats/min (95% CI: 11.9–29.5) from 20 to 50% wheel-turn contractions. Heart rate also increased a mean of 13.3 beats/min (95% CI: 10.4–16.1) from handgrip to wheel-turn contractions at 20% maximal force, and 18.9 beats/min (95% CI: 9.8–28.0) from handgrip to wheel-turn contractions at 50% maximal force. We conclude that the magnitude of the heart rate increase during isometric exercise is related to the intensity of the contraction and the mass of the contracted muscle.

Effect of muscle mass on muscle mechanoreflex-mediated heart rate increase at the onset of dynamic exercise

2009 ◽  
Vol 108 (3) ◽  
pp. 429-434 ◽  
Author(s):  
Lauro C. Vianna ◽  
Ricardo B. Oliveira ◽  
Plínio S. Ramos ◽  
Djalma R. Ricardo ◽  
Claudio Gil S. Araújo
Keyword(s):  
Heart Rate ◽  
Muscle Mass ◽  
Rate Increase ◽  
Dynamic Exercise ◽  
Heart Rate Increase ◽  
Muscle Mechanoreflex

scholarly journals Monitoring athletic training status using the maximal rate of heart rate increase

2016 ◽  
Vol 19 (7) ◽  
pp. 590-595 ◽  
Author(s):  
Clint R. Bellenger ◽  
Rebecca L. Thomson ◽  
Peter R.C. Howe ◽  
Laura Karavirta ◽  
Jonathan D. Buckley
Keyword(s):  
Heart Rate ◽  
Athletic Training ◽  
Rate Increase ◽  
Training Status ◽  
Maximal Rate ◽  
Heart Rate Increase

scholarly journals Movement-induced heart rate changes in epileptic and non-epileptic seizures

2009 ◽  
Vol 67 (3b) ◽  
pp. 789-791 ◽  
Author(s):  
Gisele R. de Oliveira ◽  
Francisco de A.A. Gondim ◽  
Edward R. Hogan ◽  
Francisco H. Rola
Keyword(s):  
Heart Rate ◽  
Motor Activity ◽  
Rate Increase ◽  
Epileptic Seizures ◽  
Baseline Heart Rate ◽  
Heart Rate Increase ◽  
Event Duration ◽  
Rate Analysis ◽  
Heart Rate Analysis ◽  
Video Eeg

Heart rate changes are common in epileptic and non-epileptic seizures. Previous studies have not adequately assessed the contribution of motor activity on these changes nor have evaluated them during prolonged monitoring. We retrospectively evaluated 143 seizures and auras from 76 patients admitted for video EEG monitoring. The events were classified according to the degree of ictal motor activity (severe, moderate and mild/absent) in: severe epileptic (SE, N=17), severe non-epileptic (SNE, N=6), moderate epileptic (ME, N=28), moderate non-epileptic (MNE, N=11), mild epileptic (mE, N=35), mild non-epileptic (mNE, N=33) and mild aura (aura, N=13). Heart rate increased in the ictal period in severe epileptic, severe non-epileptic, moderate epileptic and mild epileptic events (p<0.05). Heart rate returned to baseline levels during the post ictal phase in severe non-epileptic seizures but not in severe epileptic patients. Aura events had a higher baseline heart rate. A cut-off of 20% heart rate increase may distinguish moderate epileptic and mild epileptic events lasting more than 30 seconds. In epileptic seizures with mild/absent motor activity, the magnitude of heart rate increase is proportional to the event duration. Heart rate analysis in seizures with different degrees of movement during the ictal phase can help to distinguish epileptic from non-epileptic events.

Heart rate increase predicts challenging behavior episodes in preschoolers with autism

Stress ◽  
2019 ◽  
Vol 22 (3) ◽  
pp. 303-311 ◽  
Author(s):  
Heather J. Nuske ◽  
Emma Finkel ◽  
Darren Hedley ◽  
Valentina Parma ◽  
Liza Tomczuk ◽  
...  
Keyword(s):  
Heart Rate ◽  
Challenging Behavior ◽  
Rate Increase ◽  
Heart Rate Increase

Arterial pressure-flow relations in the awake standing dog

1975 ◽  
Vol 229 (5) ◽  
pp. 1261-1270 ◽  
Author(s):  
W Enrlich ◽  
FV Schrijen ◽  
TA Solomon ◽  
E Rodriguez-Lopez ◽  
RL Riley
Keyword(s):  
Heart Rate ◽  
Arterial Pressure ◽  
Rate Increase ◽  
Diastolic Pressure ◽  
Aortic Pressure ◽  
Left Ventricular ◽  
Right Atrial ◽  
Heart Rate Increase ◽  
Underlying Mechanisms ◽  
The Right

The transient circulatory changes following paced heart rate increase are reported from 133 trials with 6 unanesthetized dogs with chronically implanted monitoring devices for heart rate, cardiac output, aortic blood pressure, and mean right atrial pressure. In 62 trials with 2 of the dogs, pulmonary artery, and left ventricular end-diastolic pressure, as well as left ventricular dP/dt were also studied. The sequence of changes in pressures and flows is analyzed in terms of probable underlying mechanisms, particularly with respect to the nature of vascular resistances. The rise in aortic pressure and flow during the first 3 s of paced heart rate increase, before arterial stretch receptor reflexes become active, is more consistent with an effective downstream pressure of about 49 mmHg, presumably at the arteriolar level, than with an effective downstream pressure close to 0 mmHg at the right atrial level. In the pulmonary circulation where vascular reflex effects are less prominent, the pattern of pulmonary arterial pressure and flow for the entire 30 s of observation is consistent with an effective downstream pressure of 9 mmHg, presumably at the alveolar or pulmonary arteriolar level, rather than at the level of the left ventricular end-diastolic pressure.

scholarly journals Differential effect of regadenoson versus dipyridamole on heart rate in patients with left bundle branch block: How does it affect the results of pharmacological nuclear stress testing?

2019 ◽  
Vol 8 ◽  
pp. 204800401982825 ◽  
Author(s):  
Mahmoud Assaad ◽  
Abeer Berry ◽  
Jaishree Palanisamy ◽  
Joseph Fenner ◽  
Marcel Zughaib
Keyword(s):  
Heart Rate ◽  
Myocardial Perfusion Imaging ◽  
Myocardial Perfusion ◽  
Left Bundle Branch Block ◽  
Rate Increase ◽  
Stress Test ◽  
Vasodilator Agents ◽  
Heart Rate Increase ◽  
Peak Heart Rate ◽  
Bundle Branch Block

Background Myocardial perfusion imaging (MPI) stress test is performed either using exercise as a stress modality or through the use of pharmacological vasodilator agents in those who cannot exercise. Regadenoson and dipyridamole are some of the most common vasodilator agents used. We aim to study the effect of these agents on the heart rate and the imaging results. Methods This was a retrospective study which included 187 patients with left bundle branch block. Patients received either dipyridamole or regadenoson during the myocardial perfusion imaging stress test. Charts were reviewed, and patient characteristics were recorded, as well as baseline heart rate, peak heart rate during stress, and angiographic data if available. Results Regadenoson increased peak, absolute and relative heart rates significantly more compared to dipyridamole. The peak heart rate for Regadenoson was 94.1 ± 17.36 and for dipyridamole it was 85.38 ± 16.48 BPM (P < 0.001). The relative and absolute heart rate increase in the regadenoson group were 40.75 ± 23.01% and 26.06 ± 13.44 BPM, respectively. The relative and absolute heart rate increase in the dipyridamole group were 24.61 ± 18.25% and 16.23 ± 10.97 BPM. The frequency of reversible septal defects was similar in both groups (54% for Regadenoson vs. 63% for Dipyridamole; P = 0.24). Conclusions There is a statistically significant increase in heart rate with the use of regadenoson for MPI compared to dipyridamole. However, the number of septal perfusion defects was similar between the two groups. The effect of this increase in heart rate, while statistically significant, is likely of no clinical significance.

Heart rate increase after pulmonary vein isolation predicts freedom from atrial fibrillation at 1 year

2019 ◽  
Vol 30 (12) ◽  
pp. 2818-2822 ◽  
Author(s):  
Zackary D. Goff ◽  
Balint Laczay ◽  
Gayane Yenokyan ◽  
Bhradeev Sivasambu ◽  
Sunil K. Sinha ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Heart Rate ◽  
Pulmonary Vein ◽  
Pulmonary Vein Isolation ◽  
Rate Increase ◽  
Heart Rate Increase
Sign in / Sign up

Export Citation Format

Share Document