Excess or deficit hydration can be fatal for marathon runners, says expert



In a long-distance race similar to a marathon, correct hydration is vital to working your greatest. While enough hydration helps to enhance your efficiency, an extra or deficit of it can result in fatal penalties.


Marathon is an extreme-level endurance train the place a runner runs for hours relying on the space he must cowl. When muscle groups contract vigorously, warmth is generated. This warmth must be dissipated. The warmth regulation centre of the physique, thus springs into motion. It will increase blood movement to the pores and skin from the place the warmth is dissipated to the surroundings by means of sweat, radiation or convection. If the encompassing temperature is low, the warmth could get dissipated by means of radiation and convection. However, if the surroundings is heat and humid, then the first mode of warmth dissipation is sweat. Depending on a person’s genetic construction, clothes and surroundings, the sweat fee could be extreme or minimal.


Runners are vulnerable to dehydration due to sweating excessively, particularly once they run in heat and humid climatic situation. For instance, in a metropolis like Mumbai, the place the local weather can be greatest described as reasonably scorching with a excessive degree of humidity, runners are at a higher threat of dehydration. Dehydration results in lack of each water and electrolytes. Excessive lack of water (lack of physique weight by greater than two per cent) and electrolytes throughout working, results in muscle cramps and reduces the efficiency degree. Running in severely dehydrated situation can result in extreme core warmth which can additional result in warmth stroke and rhabdomyolysis (a syndrome ensuing from the breakdown of skeletal muscle fibres with leakage of muscle contents into the bloodstream). This can trigger acute kidney failure and kidney shutdown with little or no urine movement. These are critical well being situations which can result in critical penalties.


So, it’s best to drink round 500 ml of water two to 3 hours earlier than marathon and maintain consuming 100 to 150 ml of water each 15 to 20 minutes throughout the marathon. It is sweet to drink water everytime you really feel thirsty, in order to keep away from dehydration.


The reverse to dehydration is overhydration. The physique experiences overhydration when the runner drinks extra water throughout the marathon. A standard indicator of overhydration is when the measured physique weight after the occasion is greater than the physique weight earlier than the occasion. It occurs particularly to small top and bulkier individuals who run sluggish however drink extra water. Overhydration will not be as widespread as dehydration however has critical well being dangers. Overhydration results in a situation often called hyponatremia. This is because of the dilution of the electrolytes due to extra physique water. Symptomatic hyponatremia can happen when the serum sodium degree drops beneath 130 mEq/L. The standard signs are headache, vomiting, confusion, restlessness, disorientation and undue fatigue. If the serum sodium ranges drop extra quickly (beneath 120 mEq/L) then it might result in critical well being hazards similar to convulsion, coma and in some instances even loss of life.


Thus, it’s advisable to drink much less and drink at longer intervals for the individuals who run sluggish. Drink to thirst moderately than drink to max.



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