scholarly journals Sensitivity of Physiological Measures of Acute Driver Stress: A Meta-Analytic Review

2021 ◽  
Vol 2 ◽  
Author(s):  
Laora Kerautret ◽  
Stephanie Dabic ◽  
Jordan Navarro
Keyword(s):  
Heart Rate ◽  
Stress Responses ◽  
Driving Simulator ◽  
High Stress ◽  
Individual Factors ◽  
Physiological Measures ◽  
Analytic Review ◽  
Major Interest ◽  
Experimental Apparatus ◽  
Driver Stress

Background: The link between driving performance impairment and driver stress is well-established. Identifying and understanding driver stress is therefore of major interest in terms of safety. Although many studies have examined various physiological measures to identify driver stress, none of these has as yet been definitively confirmed as offering definitive all-round validity in practice.Aims: Based on the data available in the literature, our main goal was to provide a quantitative assessment of the sensitivity of the physiological measures used to identify driver stress. The secondary goal was to assess the influence of individual factors (i.e., characteristics of the driver) and ambient factors (i.e., characteristics of the context) on driver stress. Age and gender were investigated as individual factors. Ambient factors were considered through the experimental apparatus (real-road vs. driving simulator), automation driving (manual driving vs. fully autonomous driving) and stressor exposure duration (short vs. long-term).Method: Nine meta-analyses were conducted to quantify the changes in each physiological measure during high-stress vs. low-stress driving. Meta-regressions and subgroup analyses were performed to assess the moderating effect of individual and ambient factors on driver stress.Results: Changes in stress responses suggest that several measures are sensitive to levels of driver stress, including heart rate, R-R intervals (RRI) and pupil diameter. No influence of individual and ambient factors was observed for heart rate.Applications and Perspective: These results provide an initial guide to researchers and practitioners when selecting physiological measures for quantifying driver stress. Based on the results, it is recommended that future research and practice use (i) multiple physiological measures, (ii) a triangulation-based methodology (combination of measurement modalities), and (iii) a multifactorial approach (analysis of the interaction of stressors and moderators).

Detecting Drivers’ Stress in Emergency Using Physiological Sensors

2015 ◽  
Vol 742 ◽  
pp. 150-157
Author(s):  
Ying Chen
Keyword(s):  
Heart Rate ◽  
Stress State ◽  
Driving Simulator ◽  
Time Frame ◽  
Training System ◽  
Heart Rate Variability Analysis ◽  
Continuous Measure ◽  
Physiological Sensors ◽  
Emergency Scenarios ◽  
Driver Stress

This paper presented methods for collecting and analyzing heart rate data during virtual-world driving task in emergency to distinguish and assess a driver’s stress state. The primer study had developed the driver stress training system loaded on driving simulator to display 14 typical emergency scenarios in different road environment. Electrocardiogram was recorded continuously by Physiological Sensors while drivers followed a random simulated driving on the driving simulator. Data from 30 drivers of at least 10 times per scenario were collected for analysis. The data were analyzed in two ways of HRV (Heart Rate Variability) analysis. Analysis I used time domain indexes of data during the driving in the whole training to distinguish the stress occur during the time frame of the scenario with an accuracy of over 98% across multiple drivers and driving days. Analysis II compared frequency indexes of data in stress state in emergency and in clam, with a metric of observable stressors created by the scenarios. The results showed that heart rate metrics is most closely correlated with driver stress level for most drivers studied. These findings confirmed that heart rate signals can provide a metric of driver stress in future cars capable of physiological monitoring. Such measurement could be used to help manage non-critical and critical in-vehicle information systems and could also provide a continuous measure of how different road and traffic conditions affect drivers. Physiological sensors can be used in driving assistance system in future.

The Assessment of Fear of Flying: Elaboration and Validation of a Videotape as an Analogous Situation of a Flight1

1997 ◽  
Vol 13 (2) ◽  
pp. 118-130 ◽  
Author(s):  
Juan I. Capafóns ◽  
Carmen D. Sosa ◽  
Manuel Herrero ◽  
Conrado Viña
Keyword(s):  
Heart Rate ◽  
Discriminant Analysis ◽  
Post Treatment ◽  
Subjective Measure ◽  
Physiological Measures ◽  
Personal Safety ◽  
Metal Detector ◽  
Fear Of Flying ◽  
Situational Anxiety ◽  
Treatment Measures

The results are presented for the validation of a videotape as an analogous situation for a flight. The video includes the most significant elements of a flight by air: confirmation of the flight, packing, going to the airport, checking-in, going through the metal-detector, departure lounge, boarding the plane, demonstration of the personal safety drills, interiors and exteriors during the flight and landing. Two physiological measures are used for validation (heart rate and temperature) and a subjective measure (situational anxiety, SA). The results (both t-tests and the discriminant analysis) indicate that the videotape is able to discriminate between phobics and non-phobics of flying in the three variables considered. With respect to sensitivity in detecting change produced by various treatments in clients with phobia of flying, the results are also satisfactory. A greater differentiation is produced between the pre-post treatment measures, both in subjective and in the physiological measures.

scholarly journals Evolution of psychosocial burden and psychiatric symptoms in patients with psychiatric disorders during the Covid-19 pandemic

2021 ◽  
Author(s):  
Michael Belz ◽  
Philipp Hessmann ◽  
Jonathan Vogelgsang ◽  
Ulrike Schmidt ◽  
Mirjana Ruhleder ◽  
...  
Keyword(s):  
Mental Health ◽  
Mental Disorders ◽  
Psychiatric Disorders ◽  
Stress Responses ◽  
Psychiatric Symptoms ◽  
High Stress ◽  
Specific Treatment ◽  
Time Range ◽  
Long Term Effects ◽  
Psychosocial Burden

AbstractThe Covid-19 pandemic highly impacts mental health worldwide. Patients with psychiatric disorders are a vulnerable risk population for worsening of their condition and relapse of symptoms. This study investigates the pandemic-related course of psychosocial burden in patients with pre-existing mental disorders. With the newly developed Goettingen psychosocial Burden and Symptom Inventory (Goe-BSI) psychosocial burden has been traced retrospectively (1) before the pandemic (beginning of 2020), (2) at its beginning under maximum lockdown conditions (March 2020), and (3) for the current state after maximum lockdown conditions (April/May 2020). The Goe-BSI also integrates the Adjustment Disorder New Module (ADNM-20), assesses general psychiatric symptoms, and resilience. A total of 213 patients covering all major psychiatric disorders (ICD-10 F0-F9) were interviewed once in the time range from April, 24th until May 11th, 2020. Across all diagnoses patients exhibited a distinct pattern with an initial rise followed by a decline of psychosocial burden (p < 0.001, partial η2 = 0.09; Bonferroni-corrected pairwise comparisons between all three time-points: p < 0.05 to 0.001). Female gender and high ADNM-20 scores were identified as risk factors for higher levels and an unfavorable course of psychosocial burden over time. Most psychiatric symptoms remained unchanged. Trajectories of psychosocial burden vary in parallel to local lockdown restrictions and seem to reflect an adaptive stress response. For female patients with pre-existing mental disorders and patients with high-stress responses, timely and specific treatment should be scheduled. With the continuation of the pandemic, monitoring of long-term effects is of major importance, especially when long incubation times for the development of mental health issues are considered.

Responses to social evaluative stress in regular cannabis smokers

2021 ◽  
pp. 026988112097233
Author(s):  
Richard J Xia ◽  
Thomas Chao ◽  
Divya Patel ◽  
Gillinder Bedi
Keyword(s):  
Heart Rate ◽  
Stress Responses ◽  
Social Stress ◽  
Physiological Stress ◽  
Negative Mood ◽  
Mood States ◽  
Residual Effects ◽  
Subjective Response ◽  
Negative Mood States ◽  
Stress Responding

Background: Aspects of the canonical stress response differ in stimulant, opioid, and alcohol users relative to controls, and dysregulated responses to stress may contribute to continued use of these drugs. Little prior research has focused on stress responses in regular cannabis smokers. We assessed responses to a standardized laboratory social stress assay (the Trier Social Stress Task; TSST) in regular cannabis smokers (CANs) compared with controls (CONs). Methods: Healthy, non-treatment-seeking adult CANs (⩾4×/week; smoking cannabis as usual) and demographically matched CONs completed the TSST. Outcome measures were subjective mood, heart rate, and salivary cortisol. Results: Nineteen CANs (1 female) and 20 CONs (2 female) participated; groups were matched on trauma exposure, sex, race, and age. CANs smoked cannabis 6.4 ± 1.1 days/week. Eight CANs and one CON smoked tobacco cigarettes daily. Overall, the TSST produced expected increases in anxiety, negative mood states, cortisol, and heart rate. CANs had blunted subjective response to stress relative to CONs, but they did not differ in physiological (cortisol and cardiovascular) stress responding. Conclusion: These results indicate that CANs have blunted mood responses to social stress, but normative physiological stress responding. Observed differences could be due to residual effects of cannabis, reluctance to endorse negative mood states, or to issues related to identifying (i.e., emotional identification) or feeling (i.e., interoception) stress-related affective states. Further research is warranted to characterize the mechanisms of these differences and assess implications for daily functioning and treatment outcomes.

Heart rate responses and plasma cortisol concentrations in ewes: comparison between cervical and laparoscopic intrauterine insemination and their associated handling procedures

1998 ◽  
Vol 66 (2) ◽  
pp. 383-387 ◽  
Author(s):  
M. Khalid ◽  
W. Haresign ◽  
D. G. Bradley
Keyword(s):  
Heart Rate ◽  
Stress Responses ◽  
Plasma Cortisol ◽  
Intrauterine Insemination ◽  
Management Practice ◽  
Treatment Groups ◽  
Cortisol Responses ◽  
The Mean ◽  
Pre Treatment ◽  
Mean Heart Rate

AbstractThis study consisted of two experiments. In experiment 1, stress responses of sheep which were restrained either in a laparoscopy cradle or a roll-over cradle were compared. The results of this experiment indicated that restraint in roll-over cradle is less (P < 0·05) stressful than that in a laparoscopy cradle when assessed in terms of the elevation and duration of both the mean heart rate and plasma cortisol responses. Experiment 2 compared the stress responses of sheep subjected to restraint in a laparoscopy cradle, restraint in a laparoscopy cradle with intrauterine artificial insemination (AI) by laparoscopy, minimal restraint with cervical AI or restraint in a roll-over cradle plus foot-trimming. All treatments resulted in significant elevations in both heart rate and plasma cortisol concentrations (F < 0·001). The peak heart rate was significantly (P < 0·05) higher in ewes subjected to cervical AI than in those subjected to intrauterine insemination, with other treatments intermediate. The peak cortisol response did not differ among different treatments. The duration over which both the mean heart rate and -plasma cortisol concentrations remained significantly elevated above pre-treatment concentrations did not differ among treatment groups. The results of this study suggest that while restraint using a laparoscopy cradle is more stressful than that using a rollover cradle, the stress inflicted by intrauterine insemination by laparoscopy itself is no greater than that due to restraint using the laparoscopy cradle alone, cervical AI or the management practice offoot-trimming using a rollover cradle.

Physiological and Metabolic Responses to Exercise on Treadmill, Elliptical Trainer, and Stepper: Practical Implications for Training

2020 ◽  
pp. 1-8
Author(s):  
Andrew N. Bosch ◽  
Kirsten C. Flanagan ◽  
Maaike M. Eken ◽  
Adrian Withers ◽  
Jana Burger ◽  
...  
Keyword(s):  
Heart Rate ◽  
Oxygen Consumption ◽  
Energy Expenditure ◽  
Physiological Responses ◽  
Maximal Oxygen Consumption ◽  
Metabolic Responses ◽  
Physiological Measures ◽  
Fuel Utilization ◽  
Trained Runners ◽  
Practical Implications

Elliptical trainers and steppers are proposed as useful exercise modalities in the rehabilitation of injured runners due to the reduced stress on muscles and joints when compared to running. This study compared the physiological responses to submaximal running (treadmill) with exercise on the elliptical trainer and stepper devices at three submaximal but identical workloads. Authors had 18 trained runners (male/female: N = 9/9, age: mean ± SD = 23 ± 3 years) complete randomized maximal oxygen consumption tests on all three modalities. Submaximal tests of 3 min were performed at 60%, 70%, and 80% of peak workload individually established for each modality. Breath-by-breath oxygen consumption, heart rate, fuel utilization, and energy expenditure were determined. The value of maximal oxygen consumption was not different between treadmill, elliptical, and stepper (49.3 ± 5.3, 48.0 ± 6.6, and 46.7 ± 6.2 ml·min−1·kg−1, respectively). Both physiological measures (oxygen consumption and heart rate) as well as carbohydrate and fat oxidation differed significantly between the different exercise intensities (60%, 70%, and 80%) but did not differ between the treadmill, elliptical trainer, and stepper. Therefore, the elliptical trainer and stepper are suitable substitutes for running during periods when a reduced running load is required, such as during rehabilitation from running-induced injury.

scholarly journals Member influence in cooperatives: Contributions of Scandinavian studies to the research conducted in the United States

1984 ◽  
Vol 56 (2) ◽  
pp. 101-129
Author(s):  
Petri Ollila
Keyword(s):  
United States ◽  
Decision Making ◽  
Interest Groups ◽  
The United States ◽  
External Factors ◽  
West Germany ◽  
Individual Factors ◽  
Internal Factors ◽  
Major Interest ◽  
Interest Organizations

This literature review summarizes research on member influence in cooperatives conducted in Scandinavia and some of the research conducted in West Germany. The review divides the contents of member influence into three components; individual factors, the cooperative organization’s internal factors and the organization’s external factors. As individual factors, participation, representation and representativeness are considered. Conflicts in cooperative organizations, the effect of the growth of the organization and the rules of decision making are discussed as organizations internal factors. The major interest groups in addition to members (the market, personnel and the society) are presented as external factors. The external factors are increasingly challenging the nature of cooperatives as member interest organizations.

scholarly journals Genome-wide identification and functional characterization of Camelina sativa WRKY gene family in response to abiotic stress

2020 ◽  
Author(s):  
Yanan Song ◽  
Hongli Cui ◽  
Ying Shi ◽  
Jinai Xue ◽  
Chunli Ji ◽  
...  
Keyword(s):  
Gene Family ◽  
Stress Responses ◽  
Stress Resistance ◽  
Segmental Duplication ◽  
Functional Characterization ◽  
High Stress ◽  
Camelina Sativa ◽  
Genome Wide ◽  
Large Expansion

Abstract Background: WRKY transcription factors are a superfamily of regulators involved in diverse biological processes and stress responses in plants. However, knowledge is limited for WRKY family in camelina (Camelina sativa), an important Brassicaceae oil crop with strong tolerance against various stresses. Here, genome-wide characterization of WRKY proteins is performed to examine their gene-structures, phylogenetics, expressions, conserved motif organizations, and functional annotation to identify candidate WRKYs mediating regulation of stress resistance in camelina.Results: Total of 242 CsWRKY proteins encoded by 224 gene loci distributed uneven on chromosomes were identified, and classified into three groups via phylogenetic analysis according to their WRKY domains and zinc finger motifs. 15 CsWRKY gene loci generated 33 spliced variants. Orthologous WRKY gene pairs were identified, with 173 pairs in C. sativa and Arabidopsis genomes as well as 282 pairs for C. sativa and B. napus, respectively. 137 segmental duplication events were observed but no tandem duplication in camelina genome. Ten major conserved motifs were examined, with WRKYGQK as the most conserved and several variants existed in many CsWRKYs. Expression analysis revealed that half more CsWRKY genes were expressed constitutively, and a set of them had a tissue-specific expression. Notably, 11 CsWRKY genes exhibited significantly expression changes in plant seedlings under cold, salt, and drought stress, respectively, having preferentially inducible expression pattern in response to the stress.Conclusions: The present described a detail analysis of CsWRKY gen family and their expression profiled in twelve tissues and under several stress conditions. Segmental duplication is the major force for large expansion of this gene family, and a strong purifying pressure happened for CsWRKY proteins evolutionally. CsWRKY proteins play important roles for plant development, with differential functions in different tissues. Exceptionally, eleven CsWRKYs, particularly five alternative spliced isoforms were found to be the key players possibly in mediating plant response to various stresses. Overall, our results provide a foundation for understanding roles of CsWRKYs and the precise mechanism through which CsWRKYs regulate high stress resistance to stress as well as development of stress tolerance cultivars for Cruciferae crops.

scholarly journals PROGNOSTIC FACTORS IN SEVERE HEAD INJURY "A CLINICO RADIOLOGICAL STUDY"

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Dr. I. D. Chaurasia ◽  
Dr. Avais Ahmed Khan ◽  
Dr. Neeraj Mane ◽  
Dr. Prateek Malpani ◽  
Dr. M. C. Songara
Keyword(s):  
Heart Rate ◽  
Stress Responses ◽  
Severe Head Injury ◽  
Physiological Responses ◽  
Vital Signs ◽  
Behavioral Responses ◽  
Auditory Stimulation ◽  
Energy Demands ◽  
Significant Difference ◽  
Different Types

Overview:  Infants experience stressors. Stress responses in infants include physiological responses (HR and oxygen saturation) and behavioral responses (behavioral state, motor activity, and signs of behavioral distress). Modulation of the stress response in infants may reduce energy demands and enhance recovery. The characteristics of auditory stimulation provided by music differ from those of other types of auditory stimulation. The infants respond differently to music than to other random noises. This study was carried out to examine the effects of different types of music on vital signs of infants. Methodology: Thirty infants were included in the study. They were divided into two groups. Low and High pitched music was used with for two individual groups. The immediate effect was assessed through pre and post recordings for Heart rate, Reapiratory rate and O2 saturation level. Results: There was statistically significant change in Heart Rate, Respiratory Rate and O2 saturation individually. While comparing post data, except Heart Rate there was no significant difference found with both types of music. Conclusion: Low pitched music has better immediate effect than high pitched music Key words: High pitched music, Low pitched music, Infants

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