Anthropologists say that man evolved out of the sea and it is absolutely a fact that our prehistoric ancestors swam according to interpretations of cave drawings in Sura, Egypt. However, the earliest written references to swimming are from about 2000 BC, but people should have been bathing, swimming and fishing long before that.
Swimming competitions started in Europe around the turn of the Nineteenth Century, but there are sure to have been swimming competitions long before that in Europe and in other continents around the world. John Arthur Trudgen made the front crawl famous in 1873, although it is likely that this style was being used in other parts of the world.
Until 1873, the breast stroke was the preferred style of swimming in Europe and America. The crawl, which was first known as the Trudgen, became an Olympic sport in 1896, the first of the modern Olympics, which were held in Athens. The butterfly stroke was introduced in 1952, before which it was considered as a variant of the breast stroke.
The vast bulk of our bodies is made up of water and there is a lot of oil as well. This means that the body is less dense than water, which also means that the human body floats under normal circumstances. So, the body will float in fresh and salt water at or 50%-ish below the surface.
You can rise above this level by paddling water downwards, which will push the body up or you can move forwards by pushing water behind you. A blend of both of these actions will propel a swimmer forward at or above the surface of the surrounding water.
It is easier to swim in salt water than fresh water, because the salt makes the water denser which means that your body will float higher in it. Decent swimmers or rather fast swimmers have subtle hips.
Swinging from one arm to another in the crawl, which is the fastest stroke, depends on hip action not on substantial arm muscles. After all, the amount of water that you can move with your hands is not that weighty.
Thigh muscles are important for a continuous, rhythmic beat and co-ordination is equally important. There are different styles of swimming the crawl, some swimmers prefer to draw the water back with cupped hands, others with flat hands and yet others with fingers slightly open.
Breathing is essential for any form of continuous exercise. It is better to control the breathing so that you breathe in on one stroke, hold it for a stroke and breathe out during the next two strokes. This means that you just have to lift your mouth out of the water every four strokes.
Swimming is a fantastic exercise because it exercises numerous muscles at the same time, but does not put pressure on hip, knee or ankle joints. It also increases the amount of oxygen in the blood., as do most exercises, but swimming encourages the partaker to hold in breath which means that the swimmer gets all the benefits from that air.
Owen Jones, the writer of this article, writes on various topics, but is now concerned with Speedo Swimming Costumes. If you would like to know more, please visit our web site at Swimwear For Big Busts.
Some Facts About Satellite Radio Technology
Satellite radio technology is the equivalent of cable or satellite television and it is certainly here to stay. There are several reasons for this: the quality of the broadcasts is higher, the quality of the apparatus’s reception is higher and the general coverage of the station, that is to say the so-called satellite’s footprint is far greater too.
This means that if you travel long distances, you will be able to stick with the same channel without having to look for a new one every forty or fifty miles as you need to do with AM or FM radio channels.
In order to reach this quality, the recording and playback speed needs to be around the 384 kbps level. The music tracks are catalogued in a similar way to the MP3 system, which uses names called ID3 tags.
Each station on satellite radio attempts to establish its own identity. A music station may try this by playing music only of one type or from only one period or decade. This means that you may get a satellite radio station called 1970′s Punk music or Twentieth Century Classical Music.
On some stations, the music controller or disc jockey will choose, say, fifty minutes worth of music, will listen to it in order to ascertain that the quality and the order are correct and then let the computer play it over the airwaves. This leaves ten minutes every hour for the news and then the programme can be repeated automatically.
Satellite transmission uses digital recordings and each channel is encoded on a different frequency. Similarly, each decoder, say, in your car or your home needs to recognize and decode each channel separately as well. This coding and decoding is done very quickly, in fact in what is called ‘real time’.
The resulting binary or digital code is then turned into into analogue signals so that your speakers can reproduce it. This process produces sound which is just about of CD quality.
The transmitting satellites are in a geo-stationary orbit at 23,000 miles above the Earth and have a large footprint which is the name given to the region of ground that is capable of receiving their broadcasts.
In America, for example, the two fields concentrated on at first were the densely populated east and west coasts in order to maximize possible income. One satellite would be incapable of covering the whole of the United States in that orbit.
In order to receive satellite transmissions, you will have to use a special antenna on your decoder. This antenna must be capable of receiving L-band transmissions for it to be of use.
These new antennas are a big improvement on the satellite dishes (similar to those used for satellite TV) that one used to have to have in order to take advantage of satellite radio technology
Owen Jones, the author of this article, writes on a variety of topics, but is now involved with Bose radio alarm clocks. If you would like to know more, please visit our web site at Bose Digital Radio.