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Evidence-Based Complementary and Alternative Medicine
Volume 2013, Article ID 382643, 6 pages
Research Article

Differences in Blood Urea and Creatinine Concentrations in Earthed and Unearthed Subjects during Cycling Exercise and Recovery

1Department of Neurosurgery, Military Clinical Hospital, Powstancow Warszawy 5, 85-681 Bydgoszcz, Poland
2University of Physical Education and Sport, Gorskiego 1, 80-336 Gdansk, Poland
3Novo-Med Non-Public Health Care Institution, Kurpinskiego 12/10, 85-096 Bydgoszcz, Poland
4Medical University, Debinki 1, 80-211 Gdansk, Poland

Received 5 March 2013; Revised 18 June 2013; Accepted 16 July 2013

Academic Editor: David Baxter

Copyright © 2013 Paweł Sokal et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Contact of humans with the earth, either directly (e.g., with bare feet) or using a metal conductor, changes their biochemical parameters. The effects of earthing during physical exercise are unknown. This study was carried out to evaluate selected biochemical parameters in subjects who were earthed during cycling. In a double-blind, crossover study, 42 participants were divided into two groups and earthed during exercise and recovery. One group was earthed in the first week during 30 minutes of cycling exercise and during recovery, and a second group was earthed in the second week. A double-blind technique was applied. Blood samples were obtained before each training session, after 15 and 30 minutes of exercise, and after 40 minutes of recovery. Significantly lower blood urea levels were observed in subjects earthed during exercise and relaxation. These significant differences were noted in both groups earthed at the beginning of exercise ( ), after 15 ( ) and 30 minutes ( ) of exercise, and after 40 minutes of relaxation ( ). Creatinine concentrations in earthed subjects during exercise were unchanged. Conclusions. Earthing during exercise lowers blood urea concentrations and may inhibit hepatic protein catabolism or increase renal urea excretion. Exertion under earthing may result in a positive protein balance.