What is the impact of seasons on the process of procreation ?
Worldwide prolific and successful conception and feel connected with the seasons and the weather.
In general, the lowest frequency of conceptions occurs in hot weather, even in different countries, there are unexplained variations.For example, seasonal patterns in the United States and Canada differ from those in Northern Europe: One study found that in the heat and in the cold temperate zones conceiving the most successful, with average monthly temperature of 14-16 ° C, the least successful at 23 ° C.
In the tropics, the situation is somewhat different.Best of all is the case when the average monthly temperature of - 26 ° C at 28 ° C indicators slightly deteriorated.The main factor hampering the successful fertilization in the tropics, is humidity rather than temperature.
question arises as to whether to make any changes to these models of human intervention (eg, air conditioning)?
US Seasonal birth patterns is most clearly expressed in the South (the warmest) states.But after air conditioning became widely used, the dependence of successful conception of the temperature on the streets has become less pronounced.
Some believe that at conception can influence the frequency of seasonal diseases.In addition, the uncomfortable hot weather are less frequent sex.Perhaps even now female fertility may undergo seasonal changes.It has been found that animals with an increase in temperature decreases the amount of sperm scrotum.People have observed the same trend.A study in Houston, Texas, has shown that, despite the widespread use of air conditioning, sperm count continues to be the lowest in the summer.
appearance of certain internal defects, such as central nervous system or the skeleton should also be a seasonal pattern (winter - the peak of the summer - the decline), although the magnitude of reduction in a variety of different areas.
For other types of malformations of the seasonal patterns observed.Some authors believe that if there is a correlation with the number of birth defects in the season, it is very small.
Assuming that weather affects only indirectly, the main reasons for the appearance of such defects believe hormonal changes (possibly related to climatological or cosmic factors), the effect of toxic metals and infectious diseases.
In addition to seasonal factors that can cause damage to the central nervous system (eg, infection), patients mothers with schizophrenia are most likely to become pregnant in the early summer.In the United States, most people diagnosed with schizophrenia are born in March and April.This seasonal pattern more clearly expressed in the New England and the Midwest than in the southern states.The situation is similar in Northern Europe, although scientists can not explain it solely seasons.
So when you were born, may also have an impact on when you die.In one study, a large-scale Russian 101,634 people who died in Kiev in 1990-2000, it was found that longevity is largely dependent on whether the person was born in a time of the year.Most early deaths were born from April to July, lived longer than all born at the beginning or end of the year.However, the difference is very small - about 2.5 years, but the overall trend is stable in both men and women.According to researchers the rate of aging can be programmed to environmental influences during critical periods of fetal development.
course undeniable that many of the seasonal rhythms of human health is very difficult to explain, relying only on the obvious external signals, namely: light and darkness, heat and cold.As will be seen, the key to our physical and emotional health can be in other, more subtle and less obvious cycles.