Covert Neuromuscular Activity of the Dominant Forearm during Visualization of a Motor Task

1998 ◽  
Vol 86 (2) ◽  
pp. 371-374 ◽  
Author(s):  
Jerry R. Livesay ◽  
Michael R. Samaras
Keyword(s):  
Heart Rate ◽  
Experimental Test ◽  
Motor Task ◽  
Single Subject ◽  
The Sun ◽  
Neuromuscular Activity ◽  
Comparison Test ◽  
Hand Size ◽  
Rubber Ball ◽  
Significant Change

This study evaluated specific covert neuromuscular activity during a silent visualization exercise. 30 subjects participated in a dual-baseline single-subject procedure. The experimental test condition required the subjects to visualize themselves squeezing a hand-size rubber ball as tightly as possible for 1 min. In the comparison test condition, subjects were asked to imagine the ‘sun setting on the horizon’ for 1 min. Visualization of the motor task brought about significant ( p < .05) increases in dominant forearm EMG (μV) and heart-rate activity (bpm) from rest to the experimental test condition. Nondominant forearm activity showed no significant changes from rest to either test condition, and heart-rate activity (bpm) showed no significant change from rest to the comparison visualization task.

Experimental Studies of a Perceptual Anomaly. II. Confirmatory and Explanatory Experiments

1952 ◽  
Vol 98 (413) ◽  
pp. 605-617 ◽  
Author(s):  
M. B. Shapiro
Keyword(s):  
Experimental Test ◽  
Block Design ◽  
Experimental Studies ◽  
Single Subject ◽  
Measurable Change

The first paper in this series described a number of experiments on a single subject, carried out to investigate an anomaly observed during performance of the Kohs Blocks test. This anomaly consisted of making the model correctly but rotated. (Illustration 1.)The first hypothesis adopted to explain this observation was that anomalies of perception are functions of disturbed figure-ground relations (Goldstein and Scheerer, 1941). This hypothesis is not precise enough to permit a deduction which would make possible an exact experimental test, i.e., a deduction defining the conditions which would produce a measurable change in the rotation phenomenon. It was therefore necessary to arrive at more definite ideas about figure-ground relations. Such ideas were found in three hypotheses developed by Goldstein and Scheerer (1941) to account for variations in speed of carrying out the Block Design test. The first of these is that the square orientation (e.g., Cards a and b in Illustration 2) of a figure would tend to diminish the frequency of appearance of the anomaly, while the diamond orientation would increase it (e.g., Cards c and d in Illustration 2).

Effect of Noise on Blood Pressure and ‘Stress’ Hormones

1982 ◽  
Vol 62 (2) ◽  
pp. 137-141 ◽  
Author(s):  
L. Andrén ◽  
G. Lindstedt ◽  
M. Björkman ◽  
K. O. Borg ◽  
L. Hansson
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Growth Hormone ◽  
Mean Arterial Pressure ◽  
Arterial Pressure ◽  
Systolic Blood Pressure ◽  
Stress Hormones ◽  
Significant Change ◽  
Male Subjects ◽  
Venous Plasma

1. Noise stimulation (95 dBA) for 20 min caused a significant increase in diastolic (12%, P < 0.001) and mean arterial pressure (7%, P < 0.001) in 15 healthy normotensive male subjects. 2. There was no significant change in systolic blood pressure or heart rate during exposure to noise. 3. Adrenaline, noradrenaline, prolactin, cortisol and growth hormone concentrations in venous plasma were not affected during noise stimulation.

Adherence to the Mediterranean dietary pattern and heart rate in the SUN project

2012 ◽  
Vol 21 (4) ◽  
pp. 521-527 ◽  
Author(s):  
M García-López ◽  
MA Martínez-González ◽  
FJ Basterra-Gortari ◽  
MT Barrio-López ◽  
A Gea ◽  
...  
Keyword(s):  
Heart Rate ◽  
Dietary Pattern ◽  
The Sun ◽  
Mediterranean Dietary Pattern ◽  
The Mediterranean ◽  
Sun Project

Gender Differences in the Causal Elements of Self-Efficacy on a High Avoidance Motor Task

1988 ◽  
Vol 10 (2) ◽  
pp. 151-166 ◽  
Author(s):  
Deborah L. Feltz
Keyword(s):  
Heart Rate ◽  
Path Analysis ◽  
Self Efficacy ◽  
Motor Task ◽  
Reciprocal Relationship ◽  
Lower State ◽  
Subsequent Performance ◽  
Autonomic Perception ◽  
Males And Females ◽  
And Performance

This investigation contrasted path analysis models for 40 males and 40 females based on the predictions of Feltz's (1982) respecification model of Ban-dura' s (1977) self-efficacy theory in the approach/avoidance of two trials of a modified back dive. The hypothesized (respecified) model proposed that previous related experiences, self-efficacy, and heart rate predicted initial back-diving performance and that previous performance and self-efficacy predicted subsequent performance. The hypothesized model also proposed that self-efficacy mediates the influence of autonomic perception of arousal on performance. Results indicated that males had lower state anxiety and autonomic perception scores than females on the first trial. No differences occurred for back-diving performance, self-efficacy, or heart rate. Path analysis results indicated that the hypothesized model fit the data better for females than for males, though it left much unexplained variance for both males and females. Females showed a reciprocal relationship between self-efficacy and performance, whereas males showed a reciprocal relationship between autonomic perception and heart rate. Previous performance and self-efficacy were strong predictors of subsequent performance for both males and females.

Cluster Headache: Heart Rate and Blood Pressure Changes During Spontaneous Attacks

Cephalalgia ◽  
1982 ◽  
Vol 2 (2) ◽  
pp. 61-70 ◽  
Author(s):  
David Russell ◽  
Are von der Lippe
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Cluster Headache ◽  
Diastolic Blood Pressure ◽  
Head Pain ◽  
The Mean ◽  
Significant Change ◽  
Pressure Changes ◽  
Change In Mean ◽  
Mean Heart Rate

The ECG findings before, during and following 81 spontaneous attacks of cluster headache in 24 patients have been recorded using a Holter cardiography system. No significant change in mean heart rate was found during attacks, when all attacks were considered as a group. Attacks which began when patients were awake differed from those which began during sleep as regards changes in mean heart rate. The mean heart rate decreased during the majority (61%) of attacks which began when patients were awake, whereas it remained unchanged or increased during the majority (67.5%) of attacks which began during sleep. The attacks which began when patients were awake also had higher absolute mean heart rate values before, during and following attacks compared to similar values for those attacks which began during sleep. Blood pressure was measured during 11 attacks and showed a significant increase in both systolic and diastolic blood pressure. The heart rate and blood pressure in six patients usually increased during induced head pain.

scholarly journals Temporal contribution of body movement to very long-term heart rate variability in humans

2000 ◽  
Vol 278 (4) ◽  
pp. H1035-H1041 ◽  
Author(s):  
Naoko Aoyagi ◽  
Kyoko Ohashi ◽  
Shinji Tomono ◽  
Yoshiharu Yamamoto
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Wigner Distribution ◽  
Body Movement ◽  
Ambulatory Monitoring ◽  
Coarse Graining ◽  
Single Subject ◽  
Activity Levels ◽  
Time Frequency

A newly developed, very long-term (∼7 days) ambulatory monitoring system for assessing beat-to-beat heart rate variability (HRV) and body movements (BM) was used to study the mechanism(s) responsible for the long-period oscillation in human HRV. Data continuously collected from five healthy subjects were analyzed by 1) standard auto- and cross-spectral techniques, 2) a cross-Wigner distribution (WD; a time-frequency analysis) between BM and HRV for 10-s averaged data, and 3) coarse-graining spectral analysis for 600 successive cardiac cycles. The results showed 1) a clear circadian rhythm in HRV and BM, 2) a 1/ f β-type spectrum in HRV and BM at ultradian frequencies, and 3) coherent relationships between BM and HRV only at specific ultradian as well as circadian frequencies, indicated by significant ( P < 0.05) levels of the squared coherence and temporal localizations of the covariance between BM and HRV in the cross-WD. In a single subject, an instance in which the behavioral (mean BM) and autonomic [HRV power >0.15 Hz and mean heart rate (HR)] rhythmicities were dissociated occurred when the individual had an irregular daily life. It was concluded that the long-term HRV in normal humans contained persistent oscillations synchronized with those of BM at ultradian frequencies but could not be explained exclusively by activity levels of the subjects.

Impact of Anti-Hepatitis C Therapy on Cardiac rhythm

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Mohamed Medhat Awad ◽  
Ahmed Ibrahim El Desoky ◽  
Azza Ahmed Omran ◽  
Ghada Abdelrahman Mohamed ◽  
Ahmed Mohamed El Missiry ◽  
...  
Keyword(s):  
Heart Rate ◽  
Hepatitis C ◽  
Cardiac Rhythm ◽  
Holter Monitoring ◽  
Interval Duration ◽  
Hepatitis C Therapy ◽  
Pr Interval ◽  
The Mean ◽  
Significant Change ◽  
Post Therapy

Abstract Background The use of direct-acting antiviral (DAA) has raised some concerns about the possibilities of cardiac toxicity after US Food and Drug Administration (FDA) issued a safety announcement of serious slowing of the heart rate when Amiodarone was used with hepatitis C treatment . Aim The aim of the present study was to assess the impact of Anti-Hepatitis C Therapy on cardiac rhythm using 24 hours Holter monitoring. Methods The current study was conducted on fifty consecutive adult patients with chronic hepatitis C infection eligible for DAA therapy supplied in the outpatient clinic of Ain shams University Virology Center .Patients have received Sofosbuvir 400 mg and Daclatasvir 60 mg / day for 12 weeks. All patients underwent 24 hour Holter monitoring before and after the completion of therapy. Both recordings were compared as regards: heart rate, minimum and maximum heart rate, the presence and frequency of ectopic atrial or ventricular activity. The measurement of QRS intervals such PR, corrected QT intervals in msec. Results The pre and post analysis of the Holter recording was done with comparing different baseline and post therapy parameters, The pre and post therapy mean average heart rates were 79.44±10.14 bpm vs.79.96±8.77 bpm respectively (p = 0.534) which are non-significant changes. There is also non-significant change was observed in mean maximum and mean minimum heart rate 129.08±20.07 bpm 128.98±16.89 bpm (p = 0.964), 55.88±9.20 bpm 56.66±9.45 bpm (p = 0.457) respectively. And as regard corrected QT duration and PR interval duration, the mean pre-therapy PR interval was 154.00 ± 25.95 ms as compared to the mean post-medication PR interval duration 151.40 ± 23.82 ms (p = 0.124) and The mean premedication Corrected QT duration was 397.34 ± 29.38ms vs. post therapy 395.04 ± 30.23ms ( p = 0.403) Which showing a non-significant change of both intervals. And as regard the median pre-therapy and post medication PACs and PVCs numbers and the median pre-therapy and post medication attacks of tachycardia and bradycardia, they showed non-significant changes with P-value &gt; 0.05 . Conclusions Novel DAAs are safe to use as regards its effect on cardiac rhythm

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