scholarly journals Research of a Functional State of Cardiovascular and Muscular Systems of Female Greenhouse Workers during the Work Shift

2020 ◽  
pp. 53-58
Author(s):  
LA Yatsenko ◽  
NP Mamchik ◽  
NV Gabbasova
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Muscle Strength ◽  
Functional State ◽  
Work Experience ◽  
The Body ◽  
Right Hand ◽  
Greenhouse Vegetable ◽  
Greenhouse Workers ◽  
The Right

Introduction: The number of greenhouse vegetable businesses has been increasing recently. Most tasks in the greenhouses are still done manually and associated with physical stress. Our objective was to study characteristics of the circulatory and muscular systems of female greenhouse workers in the course of their work and depending on the length of service at the enterprise. The materials included some indices of the functional state of the organism of greenhouse workers growing vegetables such as the heart rate, systolic and diastolic blood pressure, muscle strength and endurance of the right hand in the process of harvesting and removing plant debris. The statistical data processing was performed using the Microsoft Excel 2016 software. The results of the study showed that the work of greenhouse vegetable growers caused gradual changes in the functioning of the cardiovascular and neuromuscular systems of the body. The most significant increase in the heart rate and blood pressure and the decrease in muscle strength and endurance were observed among the greenhouse workers with 15 or more years of work experience. We also observed a significant decrease in muscle strength of the right hand among the workers with the shortest record of service (< 5 years). The study of the functional state of the cardiovascular and muscular systems helped establish the most potentially efficient group of greenhouse vegetable growers: the smallest fluctuations of the measured indices were observed in the women with 6-9 years of service. Conclusions: Our findings prove the necessity of systematic science-based measures of disease prevention in female greenhouse employees.

THE USE OF HEART RATE TELEMETRY FOR DYNAMIC CONTROL OF THE FUNCTIONAL STATE DURING COMPUTER TESTING AND BIOFEEDBACK IN KNOWLEDGE WORKERS

2021 ◽  
Author(s):  
M.M. Nekrasova ◽  
◽  
I.V. Fedotova ◽  
S.A. Polevaya ◽  
Keyword(s):  
Heart Rate ◽  
Functional State ◽  
Work Experience ◽  
Knowledge Workers ◽  
Management Strategies ◽  
Dynamic Control ◽  
The Body ◽  
Biofeedback Training ◽  
Total Power ◽  
Neurohumoral Regulation

Abstract: Introduction. Increasing information loads can lead to the development of professional stress and work-related illnesses in knowledge workers. The development and implementation of modern methods of control and correction of the functional state of employees in the conditions of activity is relevant. The study aims – to explore the dynamics of the functional state of knowledge workers in the conditions of modeling the cognitive load on the computer and during the training on neurofeedback (NFB) based on the parameters of the electroencephalogram (EEG). Materials and methods. 17 researchers (4 men and 13 women aged 22-63 years (34.8±3.4), with an average work experience of 12.1±3.3 years) participated in the study on the basis of voluntary informed consent. Results. A significant increase in the index of the alpha rhythm was shown by 29.4% of the subjects. It was found that the total power of the spectrum of heart rate variability (HRV) is higher, the adaptive risk is lower in the group that successfully passed alpha training (p<0.05). According to the results of continuous personalized heart rate telemetry, the dynamics of the functional state (FS) during the examination was determined for each subject. Conclusion. A significant influence of the state of neurohumoral regulation systems and adaptive reserves of the body on the success of the biofeedback training was established, which is the basis for the development of methodological approaches to the correction of FS, taking into account individual optimal management strategies.

scholarly journals Assessment of the functional state of the pilot organism during the simulated flight on the simulator

2020 ◽  
pp. 17-30
Author(s):  
Василий Васильевич Сериков ◽  
Ольга Игоревна Юшкова ◽  
Валентина Евгеньевна Богданова ◽  
Евгений Владимирович Зибарев ◽  
Агния Юрьевна Форверц
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Risk Factor ◽  
Arterial Hypertension ◽  
Functional State ◽  
Continuous Monitoring ◽  
Flight Time ◽  
The Body ◽  
Physiological Cost

В статье обсуждаются проблемы динамики функционального состояния организма летчиков в условиях продолжительного полета и во время смоделированного полета на тренажере. По результатам данных непрерывного мониторирования артериального давления и частоты сердечных сокращений установлено, что высоконапряженная работа пилотов является фактором риска развития общесоматической патологии. Чем больше времени находится пилот воздушного судна в полете, тем выше физиологическая «стоимость» работы, что указывает на высочайшую степень их загруженности даже во время тренировочного полета. По мере увеличения длительности рабочей нагрузки наблюдаются признаки развития артериальной гипертензии The article discusses the problems of the dynamics of the functional state of the body of pilots in the conditions of a long flight and during a simulated flight on a simulator. The results of continuous monitoring of blood pressure and heart rate revealed that the highly stressed work of pilots is a risk factor for the development of somatic pathology. The longer the flight time of an aircraft pilot, the higher the physiological “cost” of work, which indicates the highest degree of their workload even during a training flight. As the duration of the workload increases, signs of the development of arterial hypertension are observed.

Changes in Blood Pressure, Heart Rate and Breathing Rate During Moderate Swimming Activity in Rainbow Trout

1967 ◽  
Vol 46 (2) ◽  
pp. 307-315 ◽  
Author(s):  
E. DON STEVENS ◽  
D. J. RANDALL
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Rainbow Trout ◽  
Venous Blood ◽  
The Body ◽  
Swimming Activity ◽  
Breathing Rate ◽  
Blood Pressures ◽  
Ventral Aorta ◽  
Pressure Changes

1. Changes in blood pressure in the dorsal aorta, ventral aorta and subintestinal vein, as well as changes in heart rate and breathing rate during moderate swimming activity in the rainbow trout are reported. 2. Blood pressures both afferent and efferent to the gills increased during swimming and then returned to normal levels within 30 min. after exercise. 3. Venous blood pressure was characterized by periodic increases during swimming. The pressure changes were not in phase with the body movements. 4. Although total venous return to the heart increased during swimming, a decreased blood flow was recorded in the subintestinal vein. 5. Heart rate and breathing rate increased during swimming and then decreased when swimming ceased. 6. Some possible mechanisms regulating heart and breathing rates are discussed.

Normative Arm and Calf Blood Pressure Values in the Newborn

PEDIATRICS ◽  
1989 ◽  
Vol 83 (2) ◽  
pp. 240-243
Author(s):  
Myung K. Park ◽  
Da-Hae Lee
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Mexican Americans ◽  
Newborn Infants ◽  
Coarctation Of The Aorta ◽  
Upper Arm ◽  
Mean Values ◽  
The Right ◽  
Diagnosis Of Hypertension ◽  
Mean Heart Rate

Indirect BP measurement was obtained in the right upper arm in 219 healthy newborn infants with the Dinamap monitor and was compared with values obtained from the calf to establish normative BP values and to help establish a diagnosis of hypertension and coarctation of the aorta in the newborn. There were 174 Mexican-Americans (79.5%), 33 whites (15.0%), and 12 blacks (5.5%). The width of the BP cuff was selected to be 0.4 to 0.5 times the circumference of the extremities. Three supine position readings of BPs and heart rate were obtained from each site and were averaged for statistical analyses. Mean arm BP values (±SD) of the neonate less than 36 hours of age were 62.6±6.9/38.9± 5.7 mm Hg (48.0±6.2 mm Hg). Neonates older than 36 hours had slightly but significantly (P&lt;.05) greater values (4 to 6 mm Hg) than did infants younger than 36 hours of age. Active neonates had values 6 to 10 mm Hg greater than quiet neonates (P&lt;.05). BP values in the calf obtained with the same-sized cuff were almost identical with those obtained from the arm. Differences in consecutively obtained arm and calf BPs (arm values minus calf values) were 1.1±7.7 mm Hg systolic, -0.01 ± 6.2 mm Hg diastolic, and 0.9 ±6.9 mm Hg mean pressures. Mean heart rate (±SD) of neonates less than 36 hours of age was 129.4± 13.2 beats per minute and that of neonates older than 36 hours of age was 139.4± 14.1 beats per minute. These results show the following: (1) arm BPs and calf BPs using the same-sized cuff are almost identical with mean values of approximately 65/ 41 mm Hg (50 mm Hg) in neonates one to three days of age, (2) arm BP of 75/49 mm Hg (59 mm Hg) or greater is in the hypertensive range, and (3) calf BPs that are less than arm BPs by mean + 1 SD (6 to 9 mm Hg) necessitate a thorough investigation for coarctation of the aorta.

Fysiologische stressmetingen in de werksituatie: nut, beperkingen en bevindingen

2009 ◽  
Vol 22 (3) ◽  
Author(s):  
Lorenz van Doornen ◽  
Jan Houtveen
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Work Stress ◽  
Physiological Stress ◽  
Measurement Techniques ◽  
Stress Sensitivity ◽  
The Body ◽  
Limited Extent ◽  
Future Directions ◽  
Workplace Interventions

Physiological stress measures at work: relevance, limitations, and findings Physiological stress measures at work: relevance, limitations, and findings L. van Doornen & J. Houtveen, Gedrag & Organisatie, volume 22, September 2009, nr. 3, pp. 275-293 Physiological stress measures should only to a limited extent be considered as 'objective' indices of subjectively experienced work stress. Their contribution should mainly be sought in the quantification of the load on the body exerted by stress, the latter being the mediator of the health effects of work stress. For the most widely used physiological parameters in the field of work stress – blood pressure, heart rate, cardiac autonomic indices, adrenalin and cortisol – their physiology is described, their measurement techniques outlined, and an overall picture furnished with respect to differences observed between high- and low-work stress populations. Finally some suggestions are given with respect to future directions this field may take: focus on individual differences in physiological stress-sensitivity; quantification of recovery, and quantification of the effects of individual or workplace interventions.

Muscle sympathetic nerve responses to graded leg cycling

1993 ◽  
Vol 75 (2) ◽  
pp. 663-667 ◽  
Author(s):  
M. Saito ◽  
A. Tsukanaka ◽  
D. Yanagihara ◽  
T. Mano
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Oxygen Uptake ◽  
Sympathetic Nerve ◽  
Muscle Sympathetic Nerve Activity ◽  
Burst Frequency ◽  
Control Value ◽  
Leg Cycling ◽  
Exercise Muscle ◽  
The Right

The aim of this study was to clarify the relationship between sympathetic outflow to skeletal muscle and oxygen uptake during dynamic exercise. Muscle sympathetic nerve activity (MSNA) was recorded from the right median nerve microneurographically in eight healthy volunteers during leg cycling at four different intensities in a seated position for a 16-min bout. Work loads selected were 20, 40, 60, and 75% of maximal oxygen uptake (VO2max). Heart rate and blood pressure were measured during each exercise test. MSNA burst frequency was suppressed by 28% during cycling at 20% VO2max (23 vs. 33 bursts/min for control). Thereafter, it increased in a linear fashion with increasing work rate, with a significantly higher burst frequency during 60% VO2max than the control value. Both heart rate and mean blood pressure rose significantly during 20% VO2max from the control value and increased linearly with increased exercise intensity. During light exercise, MSNA was suppressed by arterial and cardiopulmonary baroreceptors as a result of the hemodynamic changes associated with leg muscle pumping. The baroreflex inhibition may overcome the muscle metaboreflex excitation to induce MSNA suppression during light exercise. These results suggest that during light exercise MSNA is inhibited, perhaps due to loading of the cardiopulmonary and arterial baroreflexes, and that during heavier exercise the increase in MSNA occurs as muscle metaboreflexes are activated.

Forearm endurance training attenuates sympathetic nerve response to isometric handgrip in normal humans

1992 ◽  
Vol 72 (3) ◽  
pp. 1039-1043 ◽  
Author(s):  
V. K. Somers ◽  
K. C. Leo ◽  
R. Shields ◽  
M. Clary ◽  
A. L. Mark
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Endurance Training ◽  
Sympathetic Nerve ◽  
Isometric Exercise ◽  
Voluntary Contraction ◽  
Isometric Handgrip ◽  
Nerve Response ◽  
The Right ◽  
Muscle Chemoreflex

Recent evidence indicates that muscle ischemia and activation of the muscle chemoreflex are the principal stimuli to sympathetic nerve activity (SNA) during isometric exercise. We postulated that physical training would decrease muscle chemoreflex stimulation during isometric exercise and thereby attenuate the SNA response to exercise. We investigated the effects of 6 wk of unilateral handgrip endurance training on the responses to isometric handgrip (IHG: 33% of maximal voluntary contraction maintained for 2 min). In eight normal subjects the right arm underwent exercise training and the left arm sham training. We measured muscle SNA (peroneal nerve), heart rate, and blood pressure during IHG before vs. after endurance training (right arm) and sham training (left arm). Maximum work to fatigue (an index of training efficacy) was increased by 1,146% in the endurance-trained arm and by only 40% in the sham-trained arm. During isometric exercise of the right arm, SNA increased by 111 +/- 27% (SE) before training and by only 38 +/- 9% after training (P less than 0.05). Endurance training did not significantly affect the heart rate and blood pressure responses to IHG. We also measured the SNA response to 2 min of forearm ischemia after IHG in five subjects. Endurance training also attenuated the SNA response to postexercise forearm ischemia (P = 0.057). Sham training did not significantly affect the SNA responses to IHG or forearm ischemia. We conclude that endurance training decreases muscle chemoreflex stimulation during isometric exercise and thereby attenuates the sympathetic nerve response to IHG.

scholarly journals Predictors of the development of cardiac arrhythmias in women after induction of superovulation in vitro fertilization

2020 ◽  
Vol 10 (5) ◽  
pp. 57-65
Author(s):  
Victoria V. Vakareva ◽  
Marina V. Avdeeva ◽  
Larisa V. Scheglova ◽  
Sergey A. Bondarev ◽  
Pavel B. Voronkov
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Cardiovascular System ◽  
Functional State ◽  
Blood Pressure Monitoring ◽  
Myocardial Oxygen Demand ◽  
Heart Rate Variability Analysis ◽  
Supraventricular Arrhythmias ◽  
Rate Profile

The article presents the results of a clinical and instrumental examination of 80 healthy women (average age 32,313,57 years) in order to assess the heart rhythm disturbances after induction of superovulation duringin vitrofertilization. All women were examined twice before and after induction of superovulation during extracorporeal fertilization. Clinical and instrumental examination included: electrocardiography at rest; echocardiography; 24-hour ECG monitoring with heart rate variability analysis; 24-hour blood pressure monitoring. Induction of superovulation is associated with a significant increase in mean daily HR max (р0,01), and consequently with an increase in myocardial oxygen demand. It has been established that induction of superovulation contributes to the development of supraventricular arrhythmias (р0,01) and an increase in episodes of apnea/hypnea (р0,01). Regression analysis revealed predictors of supraventricular arrhythmias after induction of superovulation, including adverse circadian heart rate profile, adverse circadian blood pressure profile, impaired autonomic regulation of heart activity (р0,01). It was shown that the appearance of rhythm disturbances is associated with both the initial functional state of the cardiovascular system and its response to the induction of superovulation. It was established a correlation between the estradiol concentration and the increase of daily average heart rate after induction of superovulation (r=0,30,р0,05), apnea/hypnea index after induction of superovulation (r=0,34,р0,05). Conclusion. Superovulation induction may exacerbate existing chronic cardiovascular diseases. Due to the adverse effect of superovulation induction on the daily heart rate profile, women need to evaluate the functional state of the cardiovascular system duringinvitrofertilization planning. This will prepare the woman for the upcoming procedure and avoid adverse reactions from the cardiovascular system in response to stimulation of superovulationin vitrofertilization.

Man, Machine, and Homeostasis

2011 ◽  
pp. 141-148
Author(s):  
James R. Munis
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Nervous System ◽  
Autonomic Nervous System ◽  
Fundamental Principle ◽  
The Body ◽  
Set Point ◽  
Autonomic Nervous ◽  
Claude Bernard ◽  
Shed Light

Physiologist Claude Bernard lived in a time when very little was known about the mechanisms underlying physiologic findings, and he had ample access to clues garnered from observing machines. Let's consider homeostasis (a concept championed by Bernard), an example for which an engineered machine shed light on a fundamental principle of physiology. Homeostasis is simply the tendency of the body to maintain important physiologic variables (eg, heart rate, blood pressure, PACO2) at constant, preset values. An example is a simplified mechanical governor that could be used to regulate the rotational speed of a steam engine shaft. ‘Autoregulate’ might be a more apt word because the governor performs without external help or guidance, provided it is designed and built properly. It doesn't take much imagination to see an analogy between the mechanical governor and the autonomic nervous system. Both maintain specific variables at a constant set point through a process of feedback loops.

Baroreflex modulation of heart rate and initiation of atrial activation in dogs

1988 ◽  
Vol 255 (3) ◽  
pp. H503-H513 ◽  
Author(s):  
R. B. Schuessler ◽  
T. E. Canavan ◽  
J. P. Boineau ◽  
J. L. Cox
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Right Atrial ◽  
Autonomic Blockade ◽  
Left And Right ◽  
Atrial Activation ◽  
The Right ◽  
A Site ◽  
Induced Changes ◽  
Cardiac Nerves

In open-chest dogs, blood pressure was regulated by titrating doses of phenylephrine and nitroprusside to determine its effect on heart rate and pacemaker location. Changes in blood pressure correlated with changes in heart rate (r = 0.86). Activation time mapping demonstrated multicentric atrial activation, with a site of origin-rate relationship. The fastest pacemakers were located in the most cranial regions and slowest in the most caudal areas. In this chloralose-morphine anesthetized model, autonomic blockade with atropine and propranolol suggests that acute baroreflex-induced changes in heart rate were mediated exclusively by either increased sympathetic or parasympathetic tone and were not associated with inhibition of the opposite system. Division of right and left thoracic cardiac nerves indicated the left sympathetics participated in the baroreflex in 50% of the animals and the left parasympathetics in 90% of the animals. Both the right sympathetics and parasympathetics were active in the baroreflex in all animals. The data demonstrate that physiological heart rate response is regulated through an extensive system of right atrial pacemakers modulated by both left and right efferent cardiac nerves.

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