Drinking soda during an effort in hot weather increases the risk kidney failure

Drinking soda is a bad habit. Recalling it can make sense for those who are attached to their sugary soft drink on a daily basis. The quantity consumed and the quality of the soda are also criteria to be taken into consideration.

The harms of soft drinks and industrial energy drinks that contain caffeine are known.

However, their effects are still studied in order to discover precisely the consequences of consumption according to different contexts

A study published January 2, 2019 in the American Journal of Physiology-Regulatory, Integrative and Comparative Physiology suggests that the consumption of caffeinated sugary soft drinks during physical activity in hot weather can increase the risk of kidney disease.

SODA AND RISK OF RENAL FAILURE

A research team from the University of Buffalo, New York, studied healthy adults in a lab environment that imitated working on a farm site on a hot day with a temperature of 35 ° C.

To achieve these results, volunteers completed a one-hour cycle of a treadmill workout followed by three different lifting, dexterity and hammer activities.

After 45 minutes of exercise, the volunteers rested for 15 minutes in the same room drinking 0.47 L of either a high-fructose beverage, a caffeinated soft drink or water.

After the break, they repeated the cycle three more times for a total of four hours. Before leaving the laboratory, the volunteers had to drink more of the drink they were given before consuming other liquids.

The volume was either 1 liter, or a volume equal to 115% of the body weight loss due to perspiration, if this amount was greater.

The researchers measured the participants' core body temperature, heart rate, blood pressure, body weight, and kidney injury markers immediately after and 24 hours after each trial.

All volunteers participated in tests on soft drinks and water, spaced at least seven days apart.

HIGH RATES OF CREATININE

The research team found higher levels of creatinine in the blood and a lower glomerular filtration rate (filtration of blood from the kidney glomerulus leading to lower primitive urine formation) - markers of kidney damage - after the test of soft drink.

These temporary changes did not occur when participants drank water.

In addition, vasopressin, an anti-diuretic hormone that raises blood pressure, in participants' blood, was slightly dehydrated during and after the soft drink trial.

The results are clear: the consumption of sugary soft drinks during and after heat exercise does not rehydrate.

Thus, consuming drinks such as sodas as a rehydration drink during heat exercise may not be ideal.

Subsequent work will have to determine the long-term effects of soda consumption under the effect of heat and effort, but it is already obvious that this type of drink is to be avoided even outside of an effort and heat.

EXTERNAL SOURCES
Soft Drink Consumption During and Following Exercise in the Heat Elevates Biomarkers of Acute Kidney Injury. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2019; DOI: 10.1152 / ajpregu.00351.2018