jorge wrote:The rumor about blood in the urine is medically correct. When you play hard for many hours at a time (usually 6 or 8 or more), you may notice red, orange, or brownish urine. This is caused by hemoglobin filtering through your kidneys into the urine. Every time you hit a drum hard, a few tiny red blood cells get broken and the hemoglobin inside spills out into the blood plasma. Normally, this hemoglobin just gets recycled, but if there is too much, some of it filters through the kidneys and gets into the urine...
This is not uncommon among bata drummers and others who play all day religious ceremonies. It has happened to me a couple of times after really long hard rumbas. The first time it happened, before I had heard anything about it, I got really worried, but it just went away the next day.
Since free hemoglobin in the plasma can be toxic to the kidneys, it could in theory cause kidney damage. I know personally of one serious conga / bata drummer with chronic renal failure, plus the person who wrote the article you referenced above. That is the first case I have heard of of acute renal failure directly related to hand drumming. Two cases don't prove the connection, but they do suggest it. Has anyone else heard of serious conga, bata, or djembe players who have developed renal failure?
If it happens to you once, don't worry about it. If it keeps happening, I would suggest you cut back on your playing time, or play softer, or put a thinner skin on your quinto.
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