Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2004) 03, 28 - 36

Young Investigator Special Issue 1: Research article
Training Alterations in Elite Cyclists May Cause Transient Changes in Glomerular Filtration Rate
Chad D. Touchberry, Mark Ernsting, Greg Haff, J. Lon Kilgore 
Author Information
Department of Kinesiology, College of Health Sciences and Human Services, Midwestern State University, USA

J. Lon Kilgore
✉ 213 Ligon Hall, Department of Kinesiology, College of Health Sciences and Human Services, Midwestern State University, Wichita Falls, TX 76308
Publish Date
Received: 05-05-2004
Accepted: 06-08-2004
Published (online): 01-11-2004
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Training alterations in elite cyclists may cause transient changes in glomerular filtration rate. To these authors’ knowledge, no biochemical investigation of chronic renal function in athletes during a training cycle exists. The purpose of the present archival study was to evaluate the effects of training on homeostatic renal function, evaluated predicted glomerular filtration rate (GFR). Eight male competitive college cyclists (mean ± SD: age: 22.2 ± 3.8 yrs, height: 1.80 ± 0.06 m, mass: 76.6 ± 7.9 kg, and body fat was 7 ± 2%) volunteered to undergo 12 weeks of training, and were required to undergo blood sampling at timed intervals to calculate GFR. Homeostatic GFR was altered significantly during various points in the investigation. Volume and average cycling speed were found to have moderate correlations to alterations in GFR. In addition to these findings, 7 of the 8 subjects had GFR’s below normal physiological ranges during some point in the experiment. The duration, intensity, and volume of cycling appear to have an influence on renal function. This influence is pronounced during periods when the athletes are unaccustomed to the training load.

Key words: Cycling, glomerular filtration rate, renal, kidney

           Key Points
  • Chronic cycling training is associated with alterations of glomerular filtration rate.
  • Intensity of cycling exercise is associated with a reduction or resting glomerular filtration rate.
  • Serum creatinine and serum urea nitrogen are not associated with changes in glomerular filtration rate in chronically exercising cyclists.
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