Kidney status & sport
The kidneys play a central role in the body's metabolism and detoxification. Healthy kidney function is crucial for people who are active in sport, as they regulate the fluid and electrolyte balance and excrete the breakdown products of muscle metabolism, among other things.
Which laboratory values provide information about kidney function?
Various laboratory parameters are used to assess kidney function:
CreatinineA degradation product of muscle metabolism whose concentration in the blood provides information about the filtration capacity of the kidneys.
Urea: Formed during protein degradation and excreted via the kidneys; elevated levels may indicate impaired kidney function.
Cystatin CA sensitive marker for the glomerular filtration rate (GFR), independent of muscle mass.
Electrolytes (sodium, potassium, calcium, phosphate)Important minerals whose balance is regulated by the kidneys.
eGFR (estimated glomerular filtration rate)A calculated value that quantifies kidney function.
Sporting activity and its effects on kidney values
Intensive physical exertion, especially in untrained people or after long breaks in training, can lead to temporary changes in kidney values. Particularly relevant here is the CK value (creatine kinase)an enzyme that is released during muscle strain.
Elevated CK levels after training are generally harmless and reflect the body's normal response to muscle work. However, extremely high CK levels, such as those that occur after excessive training or with certain training methods such as EMS, can put a strain on the kidneys and, in rare cases, lead to complications.
Why a kidney status is useful for athletes
A regular check of kidney function helps:
Avoid overtrainingEarly recognition of stress limits through laboratory values.
Optimise regenerationAdaptation of training and recovery phases based on individual values.
Ensuring long-term healthPrevention of possible kidney damage through early intervention.
Frequently asked questions
Our practice focuses on your health and well-being.
Why is kidney function particularly important for athletes?
The kidneys regulate the fluid and electrolyte balance and filter degradation products of muscle metabolism. Optimum kidney function supports performance and regeneration.
What does an elevated CK value after training mean?
An increase in the CK value after intensive physical activity is normal and indicates muscle strain. However, persistently high values should be clarified by a doctor.
Can intensive training damage the kidneys?
This is rare in healthy people. However, extremely high CK values, such as those that occur after excessive training, can put a strain on the kidneys and in rare cases lead to complications.
How can I support my kidney function?
Adequate fluid intake, a balanced diet and appropriate exercise levels promote kidney health.
When should I have my kidney values checked?
If you experience symptoms such as persistent tiredness, muscle cramps or after intensive training phases, it makes sense to have a check-up.
How are the laboratory tests billed?
All analyses are performed as Private medical services billed according to the German Medical Fee Schedule (GOÄ). Private health insurance companies usually cover the costs.
How often should the kidney status be checked?
This depends on individual factors. If you exercise regularly, an annual check-up is recommended.
Can dietary supplements put a strain on the kidneys?
Some supplements, especially in high doses, can put a strain on the kidneys. Medical advice is recommended.
What is the difference between creatinine and cystatin C?
Both are markers for kidney function. Cystatin C is less dependent on muscle mass and is therefore often more accurate in athletes.
How quickly do elevated CK values normalise?
The values usually fall within a few days after training. Persistently high values should be clarified by a doctor.
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