Swimming is as old as the Stone Age. Writing references can
be dated back to 2000 BC and drawings were found in the cave of swimmers near
Sura, Egypt. Competitions in swimming started somewhere around 1800, in Europe.
Until then the breaststroke was very famous and John Arthur Trudgen started the
front crawl or the trudgen in 1873. It was added as a sport in the 1896 Athens
Summer Olympics, which were the first modern Olympics. Butterfly stroke was
recognized in 1952, before which it was known as a variation of breaststroke.
The water within the human body has a little less density
compared to that of the water outside, which forces the body to the surface. To
move forward, the water around should be pushed backward and to float, the water
should be pushed downward. The pushing is done by using hands as paddles and
kicking with the legs. It takes less effort to swim and float in the ocean than
in a swimming pool because salty water has more density than fresh water
because of the salts.
The basic principle involved in all swimming styles is that
the body should be kept parallel to the surface of the water and the hands
should be positioned in outward direction, inline with the head, so as to cut
though the water and reduce the friction. The more the body is slanted, the
more the drag. Also, by extending the hands, the average length at the water
line is increased which is directly proportional to the increase in the
speed.
Swimmers who have a good acceleration of hips have a good
hand force. The force of the hand is related to the rotation of the hips and
not the muscles in the arms. The stronger the hip muscles, the more the torque
generated. The body should be in an incline position so as to reduce the
frontal cross-section and drag. By doing so the shoulders do not generate bow
waves and the water line is not broken.
According to hydrodynamics, the movement of the hands and
legs, from back to front, should be as much in air as in water, during the
recovery stroke. The shoulder rotation is necessary for the forward motion and
it requires strong abdominal muscles. Some of the swimmers flatten their palms
to move the water backward and some spread their fingers slightly. Breathing is
another important factor to be worked on while swimming. Correct way of
breathing can increase performance and decrease fatigue. The body should be
trained to work on less amount of oxygen because professional swimmers take
breath in one stroke and let it out slowly till the fourth stroke. Taking a
deep breath and submerging in the water, while kicking in the water, can
control breath.
Children can be made to join summer camps that give swimming
lessons. Swimmers need to wear body skin kind of swimsuits so as to reduce the
drag and beginners can use aids such as Styrofoam Board until they learn
swimming properly. Beginners should concentrated on increasing the strength
along with the other techniques.
Swimming is a great exercise as there is less impact on the
joints and bones because the density of water is similar to the density of the
human body and the water supports the body. It is usually used to treat people
with certain disabilities and injuries. Swimming is an aerobic exercise and is
a good way to beat stress.
The problems and hazards related to swimming are drowning
and water inhalation in a contaminated environment. Extreme exhaustion can lead
to unconsciousness. Weaker people should avoid it because it can be a cause to
heart attacks, stroke, shallow water blackout and carotid sinus syncope. Excess
water intake in salty water can form foam in the lungs, which effects breathing
badly. Regular swimmers get exostosis or swimmers’ ear, which is abnormal
growth in the ear canal and athlete’s foot, which is bacterial infection in
between the toes. Chemicals in the swimming pools can cause skin and eye
irritation and can even discolor the hair. Asthmatics should avoid excess
swimming in swimming pool, as the chlorine inhalation will affect their lungs
badly. While swimming in ocean,
precautions should be taken, as there is an increased risk of getting jellyfish
sting or harm from any other aquatic animal.
No comments:
Post a Comment