Posts filed under 'Being fit'
The reaction speed is the ability that it allows us to react with a certain speed before stimuli, indications or signs.
Zaciorski wrote that the processes that take place in the individual since the stimulus takes place until the physical reaction, distinguishing five phases:
1. Perception, with the appearance of an excitement in the receiver (eye, heard, skin)
2. Transmission of the excitement to the Central Nervous System.
3. Treatment of the information that would be the step from the stimulus to the nervous system and the formation of the answer (phase of decision if it was necessary).
4. Arrival to the muscle of the sign of the Central Nervous System.
5. Stimulation of the muscle operated by the Central Nervous System and the appearance of the movement.
The process is complex and it is hence difficult to reduce the time of latency to the minimum.
The body, on the other hand, has programmed certain reflections that protect it before situations that commit its survival or to respond to very simple situations regarding those that have to adapt without thinking (stretching reflection, of straightening, etc).
The reflections express the quickest answer to a stimulus, because it stops their answer, it is not needed that the information arrives until the brain to choose, but simply to the spinal marrow to emit an automatic answer, with what the process is speeded up and the time of reaction is quicker. The journey of the stimulus is shorter, and it disappears the time of decision.
The simplest reflections leave of the spinal marrow, and as we go ascending towards the brain they leave elaborating the most complex answers.
The sensorial information travels at all the levels of the nervous system and it causes the corresponding answers, for that oneself stimulus produces different reactions, and it can combine reflective and voluntary answers.
For example, the stretching reflection, for which the abrupt stretching of the muscle provokes a reflective contraction of the same one to return to its initial longitude, it can be taken advantage of to carry out jumps and another type of elastic movements.
In the exit of heels for a career of speed, we can take advantage of the fall reflection to get a quicker answer to the exit stimulus. For that reason, the position of exit of heels requires a certain imbalance toward before.
We will continue speaking of the speed of voluntary reaction and their possibilities inside the physical activity.
Diciembre 29th, 2008
The human is a hot-blooded animal and can keep the body temperature constantly, although in a changing atmosphere.
The physical training , the infections and other circumstances cause more heat to the organism.The metabolism can elevate between five and twenty and that creates more body heat.
An excess of atmosphere temperature,and / or relative humidity are factors that have influence in the heat accumulation,specially when we do physical training.
The heat excess has to be eliminated not to increase temperature and to change vitalitiy functions.The first mechanisms to heat elimination would be :
-Conduction: Heat is transferred to other object or person by physical contact directly, for example touching an ice.
-Convention:Heat is transferred by the movement of the air or when it has contact with water.For example :cycling,swimiming.
-Radiation:The body radiates its heat to the enviromental air.For example, if it is cold.
-Evaporation: Heat is eliminated changing sweat into steam.By breathing, the urine and faeces we also eliminate steam.
Resting and with enviromental temperature in the normal level,blood moves by conduction and convention the heat outside.
The bigger part of this is eliminated by radiation and convention.Its loss elevates if it is cold,more air and more surface in contact with other cold element.But for these factors are invested the body can get hotter ( for example, sunbathing ).
During the training,the evaporation is more relevant ,being neccesary the apparition of sweat.The sweat water is generated from the blood liquid,that moves to the skin when it begins to gather a heat excess.
This processmis regulated by the termoregulation mechanisms.The excess of humidity slows the evaporation down and the organism loses more water to dissipate the same amount of heat,dehydrating quicklier,affecting to termoregulation and preformance.
During the next chapter,we will go deeper in the consecuences of the liquids losing to the organism,that is a cuestion to have in mind specially when we are working with high temperatures and very hard efforts.
It will continue …
Diciembre 6th, 2008
The reaction speed is the capacity to give answer to a stimulus. It is not necessary to confuse it with the speed of movements.
The speed of movements represents the speed with which we are able to move. It can be of many types, but it always implies muscular actions.
On the other hand, the reaction speed is a capacity that depends totally on the nervous system, without necessity of implying to the musculature.
It represents the capacity of our nervous system to receive a stimulus, to identify it, to decide if it was necessary and to send an answer to the musculature to respond.
In all the sports and activities appear the two forms. The speedy movements never appear spontaneously, they always represent the reaction before something.
In some cases it is about measuring the speed. In these cases, the sportsman has to react before a stimulus that marks the beginning of the timing.
In the case of the career of 100 flat meters, the reaction speed marks the time that lapses from the exit shot until the athlete begins the movement, and the speed of movements will determine the time that is invested in running the distance since it begins the movement until it arrives to goal.
There are other sports, as the fight, the collective sports, racket sports, etc.,in those that the speed is manifested like a quick answer to changing situations.
The boxer reacts with one it avoids quick to the attack of the contrary one, the football porter jumps to clear a ball that he goes toward his goal, etc.
The speed of movements never appears in an isolated way in the sport mark, neither in the daily life. And it is that the apparent speed the speed with which we adapt to a situation or we solve a problem.
Of there that to improve the speed in some concrete activity, it is necessary to train the speed of movements so much, as the reaction speed.
And it is that of anything it serves to the sprinter to run very quick or to the boxer the very quick being, because if he doesn’t react quick, it will insert all the blows.
In a next chapter we will speak of the reflections that are the quickest answers that the human being can give .
We will continue …
Agosto 12th, 2008
The creatine is one of the supplements more used lately in the training for the development of the volume and of the muscular force.
It has been marketed their use and this is to the reach almost of any person.
For that reason it is important to know this substance well, to avoid an arbitrary use that can end up to harm us.
As all the external helps, it is necessary to know as taking out it the maximum profit, and as avoiding possible contraindications.
The creatine is an organic element that is present in the muscular cells. Not it is an amino acid, but if a made up of nitrogen of the group amina that combines with the phosphorus to form the phosphocreatine.
The phosphocreatine allows to store energy in the muscle, and for its vicinity to the muscular cell assures the quick provision for the muscular contraction of high quantities of energy. For that reason it is necessary to execute and to prolong, the short efforts of high intensity.
In another moment, we will explain with more detail how it obtains from the body the necessary energy to carry out physical efforts, but to be able to understand the function of the creatine in the organism we will expose a global vision.
The muscular alone cell can get the energy to carry out its work starting from a denominated element TAP, of great simplicity and that it is only formed by three phosphorus molecules that condense an energy of great capacity in its links of union.
All the energy reservations of the body (hydrates of carbon, fatty, and even proteins) have to break down until arriving to the form of ATP to be able to be used by the muscular cell.
The way for which each one of these substances becomes TAP is different, and the time that they need to get energy, as well as the quantity given .
Certain deposits, as those of muscular glucose, are more accessible, for their proximity, and to have to suffer less decomposition to form TAP.
However, fats and proteins have to come from more distant places and they need longer elaboration processes, for what we need more than thirty minutes, for example to begin to use deposits of fat in the exercise.
It will continue.
Agosto 4th, 2008
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