Cystatin C a marker for renal function after exercise

Area of Science:

• Exercise Physiology
• Nephrology
• Biochemistry

Background:

• Renal impairment is a recognized complication of intense physical exertion.
• Current clinical methods for assessing kidney function, such as serum creatinine and estimated Glomerular Filtration Rate (eGFR) equations, have limitations, particularly in athletic populations.
• Creatinine levels can be influenced by skeletal muscle damage, and eGFR equations may be inadequate for athletes.

Purpose of the Study:

• To compare the reliability of serum cystatin C and serum creatinine as markers of renal function following strenuous exercise.
• To investigate the impact of marathon running on cystatin C and creatinine levels in recreational male runners.

Main Methods:

• Serum cystatin C and creatinine concentrations were measured in 70 recreational male runners before and after marathon running.
• Changes in cystatin C and creatinine levels were analyzed to assess their elevation and potential bias from muscle damage.

Main Results:

• Both serum cystatin C and creatinine levels were elevated in a significant proportion of runners post-marathon (26% and 46%, respectively).
• The mean increase in cystatin C was approximately half that of creatinine (21% vs. 41%), suggesting less influence from muscle damage.
• Elevations were possibly attributed to reduced renal blood flow during intense exercise.

Conclusions:

• Serum cystatin C appears to be a more reliable biomarker for assessing renal function during and after extensive exercise compared to serum creatinine.
• Further research is warranted to explore the long-term effects of training on these renal markers.