Principles of hardening
To ensure that the procedures are beneficial, five basic rules must be followed:
- Gradualness. The intensity of exposure must be increased smoothly (for example, from rubbing down to dousing and showering).
- Systematic approach. Procedures are performed every day. Irregular exposures do not form stable protective reactions.
- Proper dosing. The determining factor is the strength of the stimulus.
- Complexity. Combining different methods (air, water, sun).
- Monitoring. Mandatory assessment of the baseline health status and tracking of well-being.
Mechanisms of adaptation to thermal stimuli
Regular hardening alters the body's functioning at multiple levels. Previous reflex reactions to cold or heat fade, and new, compensatory ones are formed.
Morphological changes occur at the tissue level:
- The epidermis becomes thicker.
- The water content in tissues decreases.
- The concentration of fat in sweat gland secretions increases, which helps sweat distribute more evenly and evaporate faster.
As a result, a specific effect (resistance specifically to the trained factor, e.g., cold) and a nonspecific effect (general increase in performance and decrease in morbidity) are achieved.
Air hardening (air baths)
The skin is very sensitive to temperature and air movement. Air baths, or aerotherapy, stimulate blood circulation, metabolism, and the tone of the nervous system.
By temperature, baths are divided into:
- Warm: 20–30 °C.
- Cool: 14–20 °C (starting with 20–30 minutes).
- Cold: below 14 °C (duration 15–20 minutes).
Important rule: cold and cool baths must be combined with physical activity. The colder it is, the more intense the movements should be. Procedures are stopped when chills or goosebumps appear.
Water hardening
Water has high thermal conductivity and heat capacity, so it cools the body more strongly than air at the same temperature. This is a more vigorous method.
The key goal of a water procedure is to achieve a reverse vascular reaction: after a brief vascular spasm from the cold, there should be an influx of blood to the skin (hyperemia).
Main types of water procedures:
- Rubdown. The mildest procedure. The body is rubbed with a damp towel (movements along the blood flow toward the heart), then rubbed dry until red.
- Dousing. The mechanical impact of a falling stream is added. It tones the neuromuscular apparatus, but is contraindicated in cases of high excitability.
Briefly: answers to topical questions
What are the contraindications to hardening by dousing?
A contraindication to hardening by dousing is increased excitability of the nervous system. This water procedure combines thermal irritation with the mechanical impact from the slight pressure of a falling stream of water. This causes an energetic spasm of the skin vessels followed by their rapid relaxation, and also significantly increases the tone of the neuromuscular apparatus. Due to the pronounced stimulating effect and the creation of a feeling of vigor, dousing is not prescribed for individuals with excessive nervous excitability.
What types of water procedures are used for hardening?
Four main types of water procedures, differing in the intensity of exposure, are used for hardening.
- Rubdown — the mildest procedure, recommended for individuals with weakened health.
- Dousing — a method combining thermal irritation with the mechanical pressure of a falling stream of water.
- Shower — a procedure that exerts the strongest cooling effect due to significant mechanical irritation (includes contrast shower).
- Swimming in open bodies of water — the most valuable method, possessing a complex effect of the thermal factor, air, sunlight, and physical exercise.
What methods of sun hardening (heliotherapy) are used in hygiene?
In hygiene, air-sun baths are used for sun hardening. They are used as a preventive and therapeutic factor, exerting a general favorable effect on the body and contributing to adaptation to high air temperatures. Procedures are organized in two ways:
- Individually — in any suitable locations.
- Collectively — on specially equipped areas (solariums) located among green spaces or on the banks of reservoirs.
Baths are taken in the morning hours in a lying position with feet toward the sun, with mandatory protection of the head and eyes.
Class and exam questions
Why must hardening procedures be performed every day?
Daily repetition is necessary to consolidate trace reactions. With sporadic exposures, adaptation does not develop.
What is more important during hardening: temperature or exposure time?
The leading factor is the strength of the stimulus (temperature), rather than the duration of the procedure.
How to understand that an air bath has lasted too long?
Signs of hypothermia: chills, shivering, appearance of goosebumps. In this case, the procedure must be stopped or active movement must be started.
When is the best time to perform water procedures?
Optimally — in the morning, after sleep or exercise. At this time, the skin is evenly warmed, which produces a clear vascular reaction.
What else to study on this topic
- Specifics of using showers and swimming as hardening methods.
- Hardening with ultraviolet rays (sunbaths).
- Specifics of hardening for individuals with weakened health.
- Organization of aerariums in medical and childcare facilities.
- The role of rational clothing and footwear in thermoregulation.
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