scholarly journals Physiological Responses to Two Hypoxic Conditioning Strategies in Healthy Subjects

2017 ◽  
Vol 7 ◽  
Author(s):  
Samarmar Chacaroun ◽  
Anna Borowik ◽  
Shawnda A. Morrison ◽  
Sébastien Baillieul ◽  
Patrice Flore ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Physiological Responses

Psychophysiological Responses During the Anticipation of Emotional Pictures

2015 ◽  
Vol 29 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Sonja Schumacher ◽  
Uwe Herwig ◽  
Volker Baur ◽  
Christoph Mueller-Pfeiffer ◽  
Chantal Martin-Soelch ◽  
...  
Keyword(s):  
Heart Rate ◽  
Brain Imaging ◽  
Skin Conductance ◽  
Healthy Subjects ◽  
Physiological Responses ◽  
Negative Bias ◽  
Imaging Studies ◽  
Psychophysiological Responses ◽  
Emotional Pictures

The present study sought to investigate peripheral physiological responses to the anticipation of explicitly and ambiguously cued emotional pictures. Emotionally positive and negative as well as neutral pictures were presented to 32 healthy subjects. At the beginning of an anticipation period they were cued about the valence of the upcoming picture (neutral, positive, negative, or ambiguous). Skin conductance, heart rate, and zygomaticus and corrugator electromyogram responses were measured during anticipation and perception. Responses specific to the emotional conditions were observed during anticipation as well as during perception. During the anticipation of ambiguously cued pictures, responses were similar to responses elicited by anticipating negative pictures. In line with results from brain imaging studies, peripheral physiological responses could be interpreted to reflect a negative bias for ambiguous events.

scholarly journals Physiological Responses of Different Carriage during Level Walking on a Treadmill by Healthy Subjects

2010 ◽  
Vol 25 (6) ◽  
pp. 909-912 ◽  
Author(s):  
Haruka OZAWA ◽  
Takashi MATSUZAKI ◽  
Yuito NAKAYAMA ◽  
Hideto NAKAYAMA ◽  
Noriaki TAKAHASHI ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Physiological Responses ◽  
Level Walking

Physiological responses to emotional excitement in healthy subjects and patients with coronary artery disease

2013 ◽  
Vol 177 (2) ◽  
pp. 280-285 ◽  
Author(s):  
Olli-Pekka Piira ◽  
Johanna A. Miettinen ◽  
Arto J. Hautala ◽  
Heikki V. Huikuri ◽  
Mikko P. Tulppo
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Healthy Subjects ◽  
Physiological Responses ◽  
Emotional Excitement ◽  
Artery Disease

scholarly journals See red? Turn pale? Unveiling Emotions through Cardiovascular and Hemodynamic Changes

2005 ◽  
Vol 8 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Pedro Montoya ◽  
J. Javier Campos ◽  
Rainer Schandry
Keyword(s):  
Blood Pressure ◽  
Cardiac Output ◽  
Total Peripheral Resistance ◽  
Healthy Subjects ◽  
Impedance Cardiography ◽  
Documentary Film ◽  
Physiological Responses ◽  
Peripheral Resistance ◽  
Subjective Ratings ◽  
Hemodynamic Changes

Cardiodynamic and hemodynamic reactions to emotion-eliciting film sequences were investigated. Thirty-two healthy subjects (12 women, 20 men) were randomly assigned to one of two groups. In the first group, anger was induced using selected scenes of the film “Ragtime.” In the second group, scenes of the film “The Shining” were chosen to elicit fear. A documentary film was used as a baseline stimulus in both groups. EKG, impedance cardiography, and blood pressure were continuously monitored. The two emotional conditions elicited significant differential changes in subjective ratings and cardiovascular indices. Fear was associated with decreased cardiac output, increased total peripheral resistance, and a reduction in stroke volume and myocardial contractility. Anger was associated with an increase of cardiac output and small changes in total peripheral resistance. These results support the hypothesis that discrete emotions such as fear and anger elicit differential patterns of physiological responses.

scholarly journals Physiological Responses of Healthy Subjects to Holding Two Kinds of Objects in front of the Chest and Wearing Belts on the Wrists during Level Walking on a Treadmill

2011 ◽  
Vol 26 (2) ◽  
pp. 231-234
Author(s):  
Haruka OZAWA ◽  
Takashi MATSUZAKI ◽  
Yuito NAKAYAMA ◽  
Hideto NAKAYAMA ◽  
Noriaki TAKAHASHI ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Physiological Responses ◽  
Level Walking

scholarly journals Are Physiological Changes Experienced by Healthy Subjects during Acu-Tens Associated with Acupuncture Point Sensations?

2014 ◽  
Vol 32 (1) ◽  
pp. 28-36 ◽  
Author(s):  
David T W Yu ◽  
Alice Y M Jones
Keyword(s):  
Placebo Group ◽  
Healthy Subjects ◽  
Massachusetts General Hospital ◽  
Physiological Responses ◽  
Acupuncture Point ◽  
Control Group ◽  
Acupuncture Points ◽  
Physiological Changes ◽  
Arterial Blood ◽  
Experimental Group

Background Transcutaneous electrical nerve stimulation over acupuncture points (acu-TENS) has been reported to improve clinical outcomes. The objectives of the present study were to investigate whether acupuncture point sensations were experienced during acu-TENS, and whether such sensations were associated with any concomitant changes in autonomic nervous system activity. Methods This study adopted a single-blinded, randomised, controlled trial methodology. A total of 36 healthy subjects were randomly assigned to an experimental group (acu-TENS on right LI4 and LI11 points); control group (acu-TENS to bilateral kneecaps); or placebo group (sham acu-TENS on right LI4 and LI11 points). Heart rate (HR), mean arterial blood pressure (MAP), SD of the NN interval (SDNN) and low frequency to high frequency ratio (LF/HF) were measured before, during and after intervention. The Hong Kong Chinese version of the Massachusetts General Hospital Acupuncture Sensation Scale (C-MMASS) index was used for quantifying the acupuncture point stimulation sensations. Results The experimental group showed a significant increase in HR (mean (SD) 73.5 (6.3) to 75.9 (6.7) bpm, p=0.027), MAP (88.5 (4.5) to 91.0 (4.1) mm Hg, p=0.004), SDNN (143.36 (8.58) to 153.69 (7.64) ms, p=0.002) and LF/HF (1.26 (0.19) to 1.31 (0.21), p=0.037) during the intervention. The control group showed a significant increase in SDNN (140.21 (8.72) to 143.39 (9.47) ms, p=0.009) and LF/HF (1.21 (0.09) to 1.23 (0.12), p=0.033). There were no significant physiological changes in the placebo group. Overall C-MMASS indices for the experimental, control and placebo groups were 3.23 (0.3), 2.14 (0.6) and 0.29 (0.32), respectively. The between-group difference was statistically significant (F=139.24, df=2, p<0.05). However, correlation analysis did not support any association between sensation intensity and physiological responses in any groups (γ ranged from −0.36 to 0.25). Conclusions This study showed that ‘acupuncture point sensations’ were experienced during acu-TENS to LI4 and LI11, but such sensations were not associated with physiological responses induced during the stimulation.

Physiological responses to hypoxic constant-load and high-intensity interval exercise sessions in healthy subjects

2018 ◽  
Vol 119 (1) ◽  
pp. 123-134 ◽  
Author(s):  
S. Chacaroun ◽  
I. Vega-Escamilla y Gonzalez ◽  
P. Flore ◽  
S. Doutreleau ◽  
Samuel Verges
Keyword(s):  
High Intensity ◽  
Healthy Subjects ◽  
Physiological Responses ◽  
Constant Load ◽  
Interval Exercise ◽  
High Intensity Interval

scholarly journals Viewing garden scenes: Interaction between gaze behavior and physiological responses

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Congcong Liu ◽  
Karl Herrup ◽  
Seiko Goto ◽  
Bertram Shi
Keyword(s):  
Heart Rate ◽  
Healthy Subjects ◽  
Eye Gaze ◽  
Physiological Responses ◽  
Behavioral Responses ◽  
Gaze Behavior ◽  
Physiological Indicators ◽  
Spatial Entropy ◽  
Gaze Patterns ◽  
Transition Entropy

Previous research has shown that exposure to Japanese gardens reduces physiological measures of stress, e.g. heart rate, in both healthy subjects and dementia patients. However, the correlation between subjects’ physiological responses and their visual behavior while viewing the garden has not yet been investigated. To address this, we developed a system to collect simultaneous measurements of eye gaze and three physiological indicators of autonomic nervous system activity: electrocardiogram, blood volume pulse, and galvanic skin response. We recorded healthy subjects’ physiological/behavioral responses when they viewed two environments (an empty courtyard and a Japanese garden) in two ways (directly or as a projected 2D photograph). Similar to past work, we found that differences in subject’s physiological responses to the two environments when viewed directly, but not as a photograph. We also found differences in their behavioral responses. We quantified subject’s behavioral responses using several gaze metrics commonly considered to be measures of engagement of focus: average fixation duration, saccade amplitude, spatial entropy and gaze transition entropy. We found decrease in gaze transition entropy, the only metric that accounts for both the spatial and temporal properties of gaze, to have a weak positive correlation with decrease in heart rate. This suggests a relationship between engagement/focus and relaxation. Finally, we found gender differences: females’ gaze patterns were more spatially distributed and had higher transition entropy than males.

scholarly journals Reversal of mecamylamine-induced effects in healthy subjects by nicotine receptor agonists: Cognitive and (electro) physiological responses

2018 ◽  
Vol 84 (5) ◽  
pp. 888-899 ◽  
Author(s):  
Ricardo Alvarez-Jimenez ◽  
Ellen P. Hart ◽  
Samantha Prins ◽  
Marieke de Kam ◽  
Joop M.A. van Gerven ◽  
...  
Keyword(s):  
Healthy Subjects ◽  
Physiological Responses ◽  
Nicotine Receptor ◽  
Receptor Agonists

Reflex Responses in Upper Limb Muscles to Cutaneous Stimuli

1993 ◽  
Vol 20 (04) ◽  
pp. 271-278 ◽  
Author(s):  
R. Chen
Keyword(s):  
Stimulus Intensity ◽  
Upper Limb ◽  
Healthy Subjects ◽  
Voluntary Contraction ◽  
Cutaneous Reflexes ◽  
Focal Lesions ◽  
Normal Ranges ◽  
Conduction Velocities ◽  
Limb Muscles ◽  
Biphasic Responses

ABSTRACT:Cutaneous reflexes in the upper limb were elicited by stimulating digital nerves and recorded by averaging rectified EMG from proximal and distal upper limb muscles during voluntary contraction. Distal muscles often showed a triphasic response: an inhibition with onset about 50 ms (Il) followed by a facilitation with onset about 60 ms (E2) followed by another inhibition with onset about 80 ms (12). Proximal muscles generally showed biphasic responses beginning with facilitation or inhibition with onset at about 40 ms. Normal ranges for the amplitude of these components were established from recordings on 22 arms of 11 healthy subjects. An attempt was made to determine the alterent fibers responsible for the various components by varying the stimulus intensity, by causing ischemic block of larger fibers and by estimating the afferent conduction velocities. The central pathways mediating these reflexes were examined by estimating central delays and by studying patients with focal lesions

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