The Effect of Environmental Stresses on Human Fatigue

1977 ◽  
Vol 21 (5) ◽  
pp. 443-447
Author(s):  
Michael L. Romansky ◽  
Ralph W. Plummer ◽  
Edward S. Neumann
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Reaction Time ◽  
Stress Condition ◽  
Performance Data ◽  
Significant Deterioration ◽  
Noise Stress ◽  
Physiological Variables ◽  
Nonstress Condition ◽  
Moderate Stress

This Investigation evaluated the relative effects of a moderate or suboptimal level of environmental heat and noise stress on human stress and fatigue by utilizing performance and nonperformance parameters. Twenty-five male undergraduate and graduate students served as subjects for this investigation. Each subject was isolated in a specially constructed environmental chamber located in a laboratory. Heat and noise were designated as the two independent variables used in the study. The effects of both variables on three dependent measures were evaluated during a nonstress condition and a stress condition. Two physiological variables, heart rate and heart rate variability, were used to assess arousal effects of heat and noise stress. In addition, performance data was collected in the form of reaction time to a visual display. Analyses of physiological and performance data revealed the influential effects of the two environmental conditions tested. Heart rate and heart rate variability responses were found to be significantly higher in the moderate stress condition than in the nonstress condition. Furthermore, a statistically significant deterioration in performance was observed in the reaction time task. An increase in reaction time occurred when subjects were exposed to the moderate stress condition.

Environmental Stressors as Causal Factors for Driver Fatigue

1979 ◽  
Vol 23 (1) ◽  
pp. 272-276
Author(s):  
Michael L. Romansky ◽  
Ralph W. Plummer ◽  
Edward S. Neumann
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Task Performance ◽  
Galvanic Skin Response ◽  
Stress Condition ◽  
Continuous Exposure ◽  
Noise Stress ◽  
Skin Response ◽  
Nonstress Condition ◽  
Psychophysiological Arousal

The purpose of the investigation was to evaluate the relative effects of a moderate or suboptimal level of environmental heat and noise stress on individuals by utilizing performance and nonperformance parameters. Twenty-five male undergraduate and graduate students attending West Virginia University volunteered as subjects for this laboratory study. Each subject was isolated in a specially constructed chamber. Heat and noise were designated as the two independent variables used in the investigation. The effects of both variables on five dependent measures were evaluated for a nonstress condition and for a stress condition. Four physiological variables, which included heart rate, heart rate variability, galvanic skin response, and 17-hydroxycorticosteroid level were used to assess the level of psychophysiological arousal or activation attributed to the heat and noise stress. Task performance was measured in the form of reaction time to a visual stimulus. The data analyses revealed the influential effects of the two environmental test conditions. Relative to the nonstress condition, values for heart rate, heart rate variability, galvanic skin response, and 17-hydroxycorticosteroid level were significantly greater for the stress condition. Continuous exposure to the stress condition precipitated an increase in the level of psychophysiological arousal. Reaction times to the visual display were significantly greater for the stress condition than for the nonstress condition. The decrement in task performance occurred cumulatively over the duration of the experiment.

Correlation between heart rate variability indexes and aerobic physiological variables in patients with COPD

Respirology ◽  
2014 ◽  
Vol 20 (2) ◽  
pp. 273-278 ◽  
Author(s):  
Marceli R. Leite ◽  
Ercy Mara C. Ramos ◽  
Carlos A. Kalva-Filho ◽  
Fernanda Maria M. Rodrigues ◽  
Ana Paula C.F. Freire ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Physiological Variables

scholarly journals Quantization of mental stress using various physiological markers

2015 ◽  
Author(s):  
Apoorvagiri ◽  
Mandya Sannegowda Nagananda ◽  
Sandekere Tippeswamy Veerabhadrappa
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Reaction Time ◽  
Simple Reaction Time ◽  
Mental Stress ◽  
Stroop Test ◽  
Simple Reaction ◽  
Study Materials ◽  
Physiological Markers ◽  
Accurate Quantification

The aim of this study is to quantize mental stress by integrating different physiological markers like reaction time, photoplethysmograph (PPG), heart rate variability (HRV) and subjective markers like questionnaire. The study included 10 subjects of age between 22 and 26 years. Study materials include the results of PSS questionnaire, simple reaction time, PPG data, HRV data during a stress inducing stroop test. The study suggests that mental stress can be quantized when stress is induced acquisitively and more accurate quantification of stress can be achieved by integrating many physiological parameters.

scholarly journals EFFECTIVENESS OF DEEP BREATHING EXERCISE (DBE) ON THE HEART RATE VARIABILITY, BP, ANXIETY & DEPRESSION OF PATIENTS WITH CORONARY ARTERY DISEASE

2014 ◽  
Vol 04 (01) ◽  
pp. 035-041
Author(s):  
Fatima D'silva ◽  
Vinay H. ◽  
N.V. Muninarayanappa
Keyword(s):  
Coronary Artery Disease ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Coronary Artery ◽  
Anxiety And Depression ◽  
Deep Breathing ◽  
Mild Depression ◽  
Breathing Exercise ◽  
Physiological Variables ◽  
Artery Disease

Abstract:Psychosocial risk factors significantly contribute to the morbidity and mortality of patients with cardiovascular disorders. The present study explored the anxiety and depression status of patients with coronary artery disease and evaluated the effect of deep breathing exercise on these psychosocial variables as well as physiological variables like heart rate variability and blood pressure. A randomized control design was adopted for the study. Out of 65 clients eligible for the study, 45 were selected based on inclusion criteria. Patient were trained in Deep breathing exercise (DBE)for 2-3 days, were instructed to practice the exercise twice a day for 10 min for a period of 2 weeks, further instructed to come for follow up to cardiac OPD after 2 weeks. The study findings revealed that majority of the cardiac patients were anxious 39 (86.66%), 23(57.5%) had mild depression and 3(7.5%) were with severe depression. Fischer's exact test revealed a significant association between depression and occupation (p=0.051), monthly income (p=0.031) and co morbid disease (p=0.006, p<0.05). Karl Pearson's correlation coefficient revealed significant positive correlation between anxiety and depression i.e. (r = 0.414, p <0.01). DBE was found to be effective in reducing anxiety and diastolic BP of clients with CAD. But there was no significant reduction in HR, SBP and depression after the intervention.

Effect of Mental Workload on Heart Rate Variability and Reaction Time of Aircraft Maintenance Personnel

2021 ◽  
pp. 613-625
Author(s):  
Abdul Ghani Abdul Samad ◽  
Mohd Amzar Azizan ◽  
Md Hafis Khairuddin ◽  
Muhd Khudri Johari
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Reaction Time ◽  
Mental Workload ◽  
Aircraft Maintenance ◽  
Maintenance Personnel

The validity and reliability of ultra-short-term heart rate variability parameters and the influence of physiological covariates

2021 ◽  
Author(s):  
Joel S. Burma ◽  
Sarah Graver ◽  
Lauren N. Miutz ◽  
Alannah Macaulay ◽  
Paige V. Copeland ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Frequency Domain ◽  
Repeated Measures ◽  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Validity And Reliability ◽  
Short Term ◽  
Physiological Variables ◽  
Orthostatic Position

Background: Ultra-short-term (UST) heart rate variability (HRV) metrics have increasingly been proposed as surrogates for short-term HRV metrics. However, the concurrent validity, within-day reliability, and between-day reliability of UST HRV have yet to be comprehensively documented. Methods: Thirty-six adults (18 males, age: 26 ± 5 years, BMI: 24 ± 3 kg/m2) were recruited. Measures of HRV were quantified in a quiet-stance upright orthostatic position via three-lead electrocardiogram (ADInstruments, FE232 BioAmp). All short-term data recordings were 300-seconds in length and five UST time points (i.e., 30-seconds, 60-seconds, 120-seconds, 180-seconds, and 240-seconds) were extracted from the original 300-second recording. Bland-Altman plots with 95% limits of agreement, repeated measures ANOVA, and two-tailed paired t-tests demarcated differences between UST and short-term recordings. Linear regressions, coefficient of variation, intraclass correlation coefficients, and other tests examined the validity and reliability in both time- and frequency-domains. Results: No group differences were noted between all short-term and UST measures, for either time- (all p>0.202) or frequency-domain metrics (all p>0.086). A longer recording duration was associated with augmented validity and reliability, that was less impacted by confounding influences from physiological variables (e.g., respiration rate, carbon dioxide end-tidals, and blood pressure). Conclusively, heart rate, time-domain, and relative frequency-domain HRV metrics were acceptable with recordings greater or equal to 60s, 240s, and 300s, respectively. Conclusions: Future studies employing UST HRV metrics, should thoroughly understand the methodological requirements to obtain accurate results. Moreover, a conservative approach should be utilized regarding the minimum acceptable recording duration, which ensures valid/reliable HRV estimates are obtained.

scholarly journals Influence of ishemic stroke on changes of parameters of heart rate variability and clinical-echocardiografical parameters in patient with chronic heart failure in the early recovery period

2008 ◽  
Vol 7 (5-1) ◽  
pp. 122-127
Author(s):  
D. A. Doshchannikov ◽  
T. V. Mokina
Keyword(s):  
Heart Failure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Chronic Heart Failure ◽  
Recovery Period ◽  
Early Recovery ◽  
Significant Deterioration ◽  
Systolic Volume ◽  
End Diastolic Volume ◽  
Early Recovery Period

The purpose of present research is to estimate the influence of ischemic stroke on changes of clinical and instrumental parameters in patients with chronic heart failure (CHF) depending on expressiveness of neurologic deficiency. We supervised 103 patients with CHF, among them 71 patients with stroke. In all the patients twice heart rate variability and echocardiography were carried out. To determine CHF FC we used an estimation scale of a clinical condition (SHOCKS by Mareev, 2000). After 6 months all the patients were divided into 2 groups depending on expressiveness of neurological deficieny. Significant deterioration of heart rate variability (HRV) parameters in the group of patients with expressed neurological deficiency was revealed. Also in this group increase of end diastolic volume, end systolic volume and deterioration of diastolic function was revealed. 6 months after stroke in patients with CHF with expressed neurological deficiency reduction of parameters of HRV, progressiveness of hyperactivity of sympathetic adrenal system, deterioration of morphological-functional parameters of left ventrical was revealed.

scholarly journals Quantization of mental stress using various physiological markers

2015 ◽  
Author(s):  
FNU Apoorvagiri ◽  
Mandya Sannegowda Nagananda
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Reaction Time ◽  
Simple Reaction Time ◽  
Mental Stress ◽  
Stroop Test ◽  
Simple Reaction ◽  
Study Materials ◽  
Physiological Markers ◽  
Accurate Quantification

The aim of this study is to quantize mental stress by integrating different physiological markers like reaction time, photoplethysmograph (PPG), heart rate variability (HRV) and subjective markers like questionnaire. The study included 10 subjects of age between 22 and 26 years. Study materials include the results of PSS questionnaire, simple reaction time, PPG data, HRV data during a stress inducing stroop test. The study suggests that mental stress can be quantized when stress is induced acquisitively and more accurate quantification of stress can be achieved by integrating many physiological parameters.

Sign in / Sign up

Export Citation Format

Share Document