Fundamentals of psychological and physiological health maintenance

In the process of his activity, a person uses not only his physical capabilities, but also spends significant psychological efforts, such as character traits, will, mental abilities, etc.

Dangerous factors caused by the peculiarities of human physiology and psychology are called psychophysiological.

Psychophysiological hazards in the modern world are factors of integrity or disorder, stability or disharmony, peace or anxiety, success or failure, physical and moral well-being. Today, there is no single factor of psychophysiological hazards that would not affect a person. Each of these factors, depending on the duration of action, can be attributed to permanent or temporary.

Psychophysiological factors of potential danger of permanent action should be considered:

1) deficiencies of the sense organs (defects of vision, hearing, etc.);

2) disruption of connections between sensory and motor centers, as a result of which a person is unable to respond adequately to certain changes perceived by the sense organs;

3) defects in coordination of movements (especially complex movements and operations, techniques, etc.);

4) increased emotionality;

5) lack of motivation for work (disinterest in achieving goals, dissatisfaction with pay, monotony of work, lack of cognitive moment, i.e. uninteresting work, etc.).

Psychophysiological factors of potential danger of temporary action are:

1) lack of experience (the appearance of a probable error, incorrect actions, tension of the neuropsychic system, fear of making a mistake);

2) carelessness (can lead to damage not only to an individual person, but also to the entire team);

3) fatigue (a distinction is made between physiological and psychological fatigue);

4) emotional phenomena (especially conflict situations, mental stress related to everyday life, family, friends, management/.

Human activity can be divided into two categories - physical and mental.

* Physical activity - activity related to specific objective actions (for example, transporting goods, instrumental production, etc.).

* Mental activity is associated with mental processes during which a person plans his actions, operating with images and language symbols.

A person in activity acts as a person who has certain motives and intended goals. Motives can be needs, feelings, etc. To carry out an activity, it is necessary to have an object of activity, internal motives, as well as a ratio of motives and goals of a person that he wants to achieve as a result of his activity. For example, a person is motivated to activity either by personal enrichment (satisfaction of personal needs), or by the impossibility of physical existence without activity.

Human physical activity

Physical work (muscle work) can be divided into two types by its nature - static and dynamic.

With static work, metabolism increases, energy consumption increases, but to a lesser extent than with dynamic work. A feature of this type of work is its pronounced tiring effect, which is due to long-term contraction and tension of the muscles, the lack of conditions for blood circulation, as a result of which the final and intermediate products of metabolism accumulate. This very quickly leads to the development of fatigue.

Dynamic work is associated with the movement of parts of the body or the whole body in space. As a result, the energy expended during such work is converted into mechanical and thermal. Dynamic muscle contractions are intermittent in nature, which contributes to full blood supply and oxygen exchange, and this, in turn, leads to less fatigue.

Muscle performance also depends on the amount of load - the greater it is, the faster the muscles get tired. To perform physical work, it is very important to find average values of the rhythm and load. This will help increase productivity and reduce the period of fatigue (fatigue will come later).

During the work of any part of the body, more blood flows to it than at rest. The more work the muscles do, the more nutrients and oxygen will flow to them with the help of blood. The more physical labor, physical culture, sports, the faster muscle fibers grow, the stronger the person becomes. Physical exercises have a good effect on the whole body, strengthen health, harden the person, make him able to withstand various adverse environmental influences.

Physical exertion causes the activation of metabolic processes. With intense exertion, the minute volume of the heart increases 6 times compared to the state of rest, the amount of oxygen absorption - 3 times. As a result, the supply of oxygen to the tissues increases 18 times.

The amount of physical work depends on the specific professional activity, the characteristics of the person, the degree of fitness, physical development, etc.

As soon as a person starts a specific job, regardless of its intensity level, there is a need to increase the amount of oxygen in the human body. Each person has their own indicator of maximum oxygen consumption (MOC). The higher the MOC, the higher the working capacity, resistance to the influence of extreme factors. In men under 25 years of age, MOC is approximately 2.8-3.0 l/min, and in athletes - 5.0-6.0 l/min. Oxygen consumption increases with increasing load on the human body. After a certain period of time, an increase in load does not lead to an increase in the concentration of oxygen in the body. This state of oxygen saturation is called the oxygen limit. Accordingly, such a load completely exhausts a person in a short period of time (in 5-10 min).

Thus, intensive physical labor places high demands on the functions of the main organs and systems of a person. Lack of training leads to a deterioration in the condition of the cardiovascular, respiratory and central nervous systems, and constant physical activity improves their functions.

Mental activity of a person

Unlike physical activity, mental activity is accompanied by lower expenditure of energy reserves, but this does not mean that it is easy. The main working organ during this type of activity is the brain. During mental activity, "the analytical and synthetic functions of the CNS are significantly activated, "the reception and processing of information becomes more difficult, +functional connections, new complexes of conditioned reflexes arise, +the role of the functions of attention, memory, tension of the visual and auditory analyzers and the load on them increases. Mental activity is characterized by *tension of attention, *non-acceptance, *memory, *a large number of stresses, *inactivity, *forced posture.

All this causes stagnant phenomena in the muscles of the legs, organs of the abdominal cavity and pelvis, the supply of oxygen to the brain deteriorates, the need for glucose increases. The functions of the visual analyzer also deteriorate: stability; clear vision, visual acuity, visual performance, visual-motor reaction time increases.

Mental work is characterized by the greatest degree of attention stress - on average 5-10 times higher than during physical work. The end of the working day does not interrupt the process of mental activity at all. A special state of the body develops - fatigue, which over time can turn into overwork. All this leads to a disruption of the normal physiological functioning of the body.

People engaged in mental activity, even in a state of overwork, are able to perform their duties for a long time without a significant decrease in the level of working capacity and productivity.

Mostly people of mental activity are unable to turn off the information processing mechanism at night; they work not only 8-12 hours a day, but almost constantly with short switching. This is confirmation of the so-called informative theory, according to which a person, during sleep, processes information received during a period of active vigor.

Physical and mental activities require different levels of stress on certain functional systems of the body, so the load must be classified according to severity and intensity. The severity of work is the stress on functional systems caused by physical exertion. Tension, in turn, characterizes the level of stress on the central nervous system.

General characteristics of labor activity

Any labor activity is characterized by two interrelated elements: physical (mechanical) - determined by the work of muscles; mental - determined by the participation of the senses, memory, thinking, emotions, and volitional activity.

The share of physical and mental components in different types of labor activity is different: during physical labor, * muscular activity prevails; during mental labor, * thinking processes are activated. But none of the types of labor occurs without regulation of the central nervous system. The study of human labor and its impact on the human body involves, first of all, a description of the physiology of labor:

* physical, neuropsychological, mental, emotional overload;

* rhythm and pace of work;.

* monotony of work;

* volume of perception and processing of information;

* biomechanical and anthropometric data.

This makes it possible to determine the +degree and nature of the body's load during work, +correspondence of the workplace and means of work to the anatomical and physiological characteristics of a person and +solve a number of practical issues:

• rational work and rest regimes,

• organization of the workplace,

• conducting professional selection and career guidance, etc.

It is known that human life is constantly accompanied by the expenditure of energy reserves, which determine the difficulty of work. Energy losses are replenished by nutrition. This is necessary to ensure constant energy exchange, that is, it is an indisputable condition of life. The amount of energy consumed is called the energy of the basic metabolism. Energy expenditure for basic metabolism can vary depending on gender, age, state of the central nervous system, intensity of functions of endocrine and enzyme systems and many other factors.

Physical efforts that a person makes in labor activity are estimated in the form of energy expenditure (measured in kJ/min, kJ/h or kCal/min, kcal/h). Their amount depends on the intensity of the load. Thus, during physical labor, the average daily energy expenditure exceeds 115 kCal/h. Energy expenditure in many cases depends on the level of mechanization of production. If it is fully automated, then the energy expenditure of workers approaches the energy expenditure of people engaged in mental labor.

Daily energy expenditure also depends on the age of a person. For example, in old age (when a retired person leads a sedentary lifestyle), daily energy expenditure can be 2.3 thousand kCal/day; for young and middle-aged people, daily energy expenditure reaches 6 thousand kcal/day.

Depending on the type of work, it is also necessary to take into account the food ration. In this case, it should not exceed 2212 kcal (the food ration should not exceed daily energy expenditure by more than 5%).

Any human activity is strongly influenced by success or failure. In some cases, success, raising a person in his own eyes, mobilizes forces to achieve new goals in work, and in others - can cause complacency. Failure in a matter to which a person has a positive attitude causes a depressed state. Depending on personal traits, unpleasant feelings can cause either refusal from further activity in a certain area, or a consistent analysis of the reasons for failure and new efforts to complete a particular task.

Success in work depends on many circumstances. One of them is creativity. The search for something new in work is characteristic only of a creative person.

Creativity elevates activity to a higher level, is the driving force of production and science. In creativity, a fusion of physical and mental forces occurs, which fully reveals the personality, gives the opportunity for self-expression.

Fatigue

The success of activity is especially influenced by the state of a person. Any type of activity causes fatigue.

* Fatigue is a decrease in the productivity of activity due to the consumption of energy resources of the human body.

This condition arises due to a certain attitude of a person to work, habits of physical and mental stress. If there are no such habits, then fatigue can occur even before the start of physical exertion, at the very beginning of work. Fatigue after hard, but necessary work for people, is associated with a positive emotional state. Rest, especially active, a change in the type of activity restores strength, creates the opportunity to continue activity. An objective indicator of fatigue is a slowdown in the pace of work, as well as a decrease in its quality.

A study of working capacity showed that in the first two hours, labor productivity increases, reaches a maximum level, and then gradually decreases. Monotonous, uninteresting work leads to fatigue occurring earlier than in cases where the work interests a person.

With overfatigue, the period of optimal working capacity is shortened, and the period of unstable compensation increases. Restorative processes in the body are also disrupted. Signs of fatigue do not disappear until the next day's work begins. Irritability increases, reactions become inadequate.

In the presence of chronic overfatigue

O labor productivity deteriorates

O the body's resistance to infection decreases

O the lability of cardiovascular system indicators increases

O tendon reflexes, sweating increase

O body weight often decreases

O the number of errors increases, failure in work

People with a state of overfatigue are characterized by sleep disturbances, lack of full recovery of working capacity by the next working day, decreased resistance to adverse environmental factors, and increased neuro-emotional excitability. Such ethane can lead to exacerbation of many diseases - cardiovascular, endocrine, bronchopulmonary, chronic, etc.

Factors that affect labor productivity

The study of working conditions has shown that there are many factors that affect labor productivity.

The main factors of influence

Labor productivity

workplace organization, stress and rest regime during work, wall color of the room, attitude to work

They form the general mood for work and facilitate or complicate the appearance of labor efforts.

When developing criteria for the professional assessment (description of labor characteristics) of the degree of nervous tension in the labor process, characteristics that reflect the tension of the sensory apparatus, higher nervous centers that provide the functions of attention, thinking, and movement regulation are used. Today, special tables have been compiled for the classification of labor by the degree of neuro-emotional tension, which are based on the following indicators:

* intellectual and emotional load;

* duration of focused observation;

* number of objects of simultaneous observation that are important for production;

* number of signals per hour;

* pace;

* number of active actions;

* the need to independently search for damage;

* monotony of work;

* visual strain;

* accuracy of work performance;

* variability;

* work and rest regime.

The degree of working capacity is also determined by the type of nervous system. A strong type has the greatest working capacity, a weak one has little. Working capacity depends on such factors as • age, • human health, • gender, • work skills, • sanitary and hygienic conditions, etc. To a certain extent, it is influenced by motivation, moral and material incentives.

It is possible to prolong stable working capacity due to > optimal level of tension of psychophysiological functions, > comfortable working conditions, > correct combination of work and rest regimes, > holding physical breaks and emotional unloading, > using special psychopharmacological means or tonic drinks, > special informing a person about the results of his activity, > supervision and control of his work. Comfortable conditions provide, in addition to high working capacity, good health; at the same time, dangerous tensions of compensatory systems of the body do not arise; human health does not deteriorate for a long time.

It is known that rest affects working capacity, labor productivity, and life activities in general. Rest can be of two types - active and passive.

*Active rest is, for example, sports, tourist trips, hikes in the forest, travel, swimming in the pool, etc. It is active rest that helps to increase working capacity, improve the mental state of the individual, and mood.

*Passive rest - watching movies, listening to music, sitting, lying down, reading books, etc. A special, but mandatory, type of such rest is sleep.

It is known that restless nights, unpleasant dreams with experiences of horrors, dangers, fear, when life seems to be hanging by a thread, and there is no strength to resist - all this negatively affects the condition of a person, and accordingly, the activity of his vital activity.

The seasons also affect a person's working capacity. For example, a decrease in working capacity is observed in the spring, especially in workers with nervous and emotional overstrain.


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Psychophysiological hazards in the modern world are factors of integrity or disorder, stability or disharmony, peace or anxiety, success or failure, physical and moral well-being. Today, there is no single factor of psychophysiological hazards that would not affect a person. Each of these factors, depending on the duration of action, can be attributed to permanent or temporary. Psychophysiological factors of potential danger of permanent action should be considered: 1) deficiencies of the sense organs (defects of vision, hearing, etc.); 2) disruption of connections between sensory and motor centers, as a result of which a person is unable to respond adequately to certain changes perceived by the sense organs; 3) defects in coordination of movements (especially complex movements and operations, techniques, etc.); 4) increased emotionality; 5) lack of motivation for work (disinterest in achieving goals, dissatisfaction with pay, monotony of work, lack of cognitive moment, i.e. uninteresting work, etc.). Psychophysiological factors of potential danger of temporary action are: 1) lack of experience (the appearance of a probable error, incorrect actions, tension of the neuropsychic system, fear of making a mistake); 2) carelessness (can lead to damage not only to an individual person, but also to the entire team); 3) fatigue (a distinction is made between physiological and psychological fatigue); 4) emotional phenomena (especially conflict situations, mental stress related to everyday life, family, friends, management/. Human activity can be divided into two categories - physical and mental. * Physical activity - activity related to specific objective actions (for example, transporting goods, instrumental production, etc.). * Mental activity is associated with mental processes during which a person plans his actions, operating with images and language symbols. A person in activity acts as a person who has certain motives and intended goals. Motives can be needs, feelings, etc. To carry out an activity, it is necessary to have an object of activity, internal motives, as well as a ratio of motives and goals of a person that he wants to achieve as a result of his activity. For example, a person is motivated to activity either by personal enrichment (satisfaction of personal needs), or by the impossibility of physical existence without activity. Human physical activity Physical work (muscle work) can be divided into two types by its nature - static and dynamic. With static work, metabolism increases, energy consumption increases, but to a lesser extent than with dynamic work. A feature of this type of work is its pronounced tiring effect, which is due to long-term contraction and tension of the muscles, the lack of conditions for blood circulation, as a result of which the final and intermediate products of metabolism accumulate. This very quickly leads to the development of fatigue. Dynamic work is associated with the movement of parts of the body or the whole body in space. As a result, the energy expended during such work is converted into mechanical and thermal. Dynamic muscle contractions are intermittent in nature, which contributes to full blood supply and oxygen exchange, and this, in turn, leads to less fatigue. Muscle performance also depends on the amount of load - the greater it is, the faster the muscles get tired. To perform physical work, it is very important to find average values of the rhythm and load. This will help increase productivity and reduce the period of fatigue (fatigue will come later). During the work of any part of the body, more blood flows to it than at rest. The more work the muscles do, the more nutrients and oxygen will flow to them with the help of blood. The more physical labor, physical culture, sports, the faster muscle fibers grow, the stronger the person becomes. Physical exercises have a good effect on the whole body, strengthen health, harden the person, make him able to withstand various adverse environmental influences. Physical exertion causes the activation of metabolic processes. With intense exertion, the minute volume of the heart increases 6 times compared to the state of rest, the amount of oxygen absorption - 3 times. As a result, the supply of oxygen to the tissues increases 18 times. The amount of physical work depends on the specific professional activity, the characteristics of the person, the degree of fitness, physical development, etc. As soon as a person starts a specific job, regardless of its intensity level, there is a need to increase the amount of oxygen in the human body. Each person has their own indicator of maximum oxygen consumption (MOC). The higher the MOC, the higher the working capacity, resistance to the influence of extreme factors. In men under 25 years of age, MOC is approximately 2.8-3.0 l/min, and in athletes - 5.0-6.0 l/min. Oxygen consumption increases with increasing load on the human body. After a certain period of time, an increase in load does not lead to an increase in the concentration of oxygen in the body. This state of oxygen saturation is called the oxygen limit. Accordingly, such a load completely exhausts a person in a short period of time (in 5-10 min). Thus, intensive physical labor places high demands on the functions of the main organs and systems of a person. Lack of training leads to a deterioration in the condition of the cardiovascular, respiratory and central nervous systems, and constant physical activity improves their functions. Mental activity of a person Unlike physical activity, mental activity is accompanied by lower expenditure of energy reserves, but this does not mean that it is easy. The main working organ during this type of activity is the brain. During mental activity, "the analytical and synthetic functions of the CNS are significantly activated, "the reception and processing of information becomes more difficult, +functional connections, new complexes of conditioned reflexes arise, +the role of the functions of attention, memory, tension of the visual and auditory analyzers and the load on them increases. Mental activity is characterized by tension of attention, non-acceptance, memory, a large number of stresses, inactivity, forced posture. All this causes stagnant phenomena in the muscles of the legs, organs of the abdominal cavity and pelvis, the supply of oxygen to the brain deteriorates, the need for glucose increases. The functions of the visual analyzer also deteriorate: stability; clear vision, visual acuity, visual performance, visual-motor reaction time increases. Mental work is characterized by the greatest degree of attention stress - on average 5-10 times higher than during physical work. The end of the working day does not interrupt the process of mental activity at all. A special state of the body develops - fatigue, which over time can turn into overwork. All this leads to a disruption of the normal physiological functioning of the body. People engaged in mental activity, even in a state of overwork, are able to perform their duties for a long time without a significant decrease in the level of working capacity and productivity. Mostly people of mental activity are unable to turn off the information processing mechanism at night; they work not only 8-12 hours a day, but almost constantly with short switching. This is confirmation of the so-called informative theory, according to which a person, during sleep, processes information received during a period of active vigor. Physical and mental activities require different levels of stress on certain functional systems of the body, so the load must be classified according to severity and intensity. The severity of work is the stress on functional systems caused by physical exertion. Tension, in turn, characterizes the level of stress on the central nervous system. General characteristics of labor activity Any labor activity is characterized by two interrelated elements: physical (mechanical) - determined by the work of muscles; mental - determined by the participation of the senses, memory, thinking, emotions, and volitional activity. The share of physical and mental components in different types of labor activity is different: during physical labor, * muscular activity prevails; during mental labor, * thinking processes are activated. But none of the types of labor occurs without regulation of the central nervous system. The study of human labor and its impact on the human body involves, first of all, a description of the physiology of labor: * physical, neuropsychological, mental, emotional overload; * rhythm and pace of work;. * monotony of work; * volume of perception and processing of information; * biomechanical and anthropometric data. This makes it possible to determine the +degree and nature of the body's load during work, +correspondence of the workplace and means of work to the anatomical and physiological characteristics of a person and +solve a number of practical issues: • rational work and rest regimes, • organization of the workplace, • conducting professional selection and career guidance, etc. It is known that human life is constantly accompanied by the expenditure of energy reserves, which determine the difficulty of work. Energy losses are replenished by nutrition. This is necessary to ensure constant energy exchange, that is, it is an indisputable condition of life. The amount of energy consumed is called the energy of the basic metabolism. Energy expenditure for basic metabolism can vary depending on gender, age, state of the central nervous system, intensity of functions of endocrine and enzyme systems and many other factors. Physical efforts that a person makes in labor activity are estimated in the form of energy expenditure (measured in kJ/min, kJ/h or kCal/min, kcal/h). Their amount depends on the intensity of the load. Thus, during physical labor, the average daily energy expenditure exceeds 115 kCal/h. Energy expenditure in many cases depends on the level of mechanization of production. If it is fully automated, then the energy expenditure of workers approaches the energy expenditure of people engaged in mental labor. Daily energy expenditure also depends on the age of a person. For example, in old age (when a retired person leads a sedentary lifestyle), daily energy expenditure can be 2.3 thousand kCal/day; for young and middle-aged people, daily energy expenditure reaches 6 thousand kcal/day. Depending on the type of work, it is also necessary to take into account the food ration. In this case, it should not exceed 2212 kcal (the food ration should not exceed daily energy expenditure by more than 5%). Any human activity is strongly influenced by success or failure. In some cases, success, raising a person in his own eyes, mobilizes forces to achieve new goals in work, and in others - can cause complacency. Failure in a matter to which a person has a positive attitude causes a depressed state. Depending on personal traits, unpleasant feelings can cause either refusal from further activity in a certain area, or a consistent analysis of the reasons for failure and new efforts to complete a particular task. Success in work depends on many circumstances. One of them is creativity. The search for something new in work is characteristic only of a creative person. Creativity elevates activity to a higher level, is the driving force of production and science. In creativity, a fusion of physical and mental forces occurs, which fully reveals the personality, gives the opportunity for self-expression. Fatigue The success of activity is especially influenced by the state of a person. Any type of activity causes fatigue. * Fatigue is a decrease in the productivity of activity due to the consumption of energy resources of the human body. This condition arises due to a certain attitude of a person to work, habits of physical and mental stress. If there are no such habits, then fatigue can occur even before the start of physical exertion, at the very beginning of work. Fatigue after hard, but necessary work for people, is associated with a positive emotional state. Rest, especially active, a change in the type of activity restores strength, creates the opportunity to continue activity. An objective indicator of fatigue is a slowdown in the pace of work, as well as a decrease in its quality. A study of working capacity showed that in the first two hours, labor productivity increases, reaches a maximum level, and then gradually decreases. Monotonous, uninteresting work leads to fatigue occurring earlier than in cases where the work interests a person. With overfatigue, the period of optimal working capacity is shortened, and the period of unstable compensation increases. Restorative processes in the body are also disrupted. Signs of fatigue do not disappear until the next day's work begins. Irritability increases, reactions become inadequate. In the presence of chronic overfatigue O labor productivity deteriorates O the body's resistance to infection decreases O the lability of cardiovascular system indicators increases O tendon reflexes, sweating increase O body weight often decreases O the number of errors increases, failure in work People with a state of overfatigue are characterized by sleep disturbances, lack of full recovery of working capacity by the next working day, decreased resistance to adverse environmental factors, and increased neuro-emotional excitability. Such ethane can lead to exacerbation of many diseases - cardiovascular, endocrine, bronchopulmonary, chronic, etc. Factors that affect labor productivity The study of working conditions has shown that there are many factors that affect labor productivity. The main factors of influence Labor productivity workplace organization, stress and rest regime during work, wall color of the room, attitude to work They form the general mood for work and facilitate or complicate the appearance of labor efforts. When developing criteria for the professional assessment (description of labor characteristics) of the degree of nervous tension in the labor process, characteristics that reflect the tension of the sensory apparatus, higher nervous centers that provide the functions of attention, thinking, and movement regulation are used. Today, special tables have been compiled for the classification of labor by the degree of neuro-emotional tension, which are based on the following indicators: * intellectual and emotional load; * duration of focused observation; * number of objects of simultaneous observation that are important for production; * number of signals per hour; * pace; * number of active actions; * the need to independently search for damage; * monotony of work; * visual strain; * accuracy of work performance; * variability; * work and rest regime. The degree of working capacity is also determined by the type of nervous system. A strong type has the greatest working capacity, a weak one has little. Working capacity depends on such factors as • age, • human health, • gender, • work skills, • sanitary and hygienic conditions, etc. To a certain extent, it is influenced by motivation, moral and material incentives. It is possible to prolong stable working capacity due to > optimal level of tension of psychophysiological functions, > comfortable working conditions, > correct combination of work and rest regimes, > holding physical breaks and emotional unloading, > using special psychopharmacological means or tonic drinks, > special informing a person about the results of his activity, > supervision and control of his work. Comfortable conditions provide, in addition to high working capacity, good health; at the same time, dangerous tensions of compensatory systems of the body do not arise; human health does not deteriorate for a long time. It is known that rest affects working capacity, labor productivity, and life activities in general. Rest can be of two types - active and passive. Active rest is, for example, sports, tourist trips, hikes in the forest, travel, swimming in the pool, etc. It is active rest that helps to increase working capacity, improve the mental state of the individual, and mood. Passive rest - watching movies, listening to music, sitting, lying down, reading books, etc. A special, but mandatory, type of such rest is sleep. It is known that restless nights, unpleasant dreams with experiences of horrors, dangers, fear, when life seems to be hanging by a thread, and there is no strength to resist - all this negatively affects the condition of a person, and accordingly, the activity of his vital activity. The seasons also affect a person's working capacity. For example, a decrease in working capacity is observed in the spring, especially in workers with nervous and emotional overstrain.
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