USA: Twee studies over het belang van goede aarding van het menselijk lichaam. (Dauwtrappen?)

donderdag, 30 september 2010 - Categorie: Onderzoeken

Bron: ACM Journal 2010 vol 16 no3 p 1-9

Pilot Study on the Effect of Grounding on Delayed-Onset
Muscle Soreness
Dick Brown, Ph.D.,1 Gae tan Chevalier, Ph.D.,2 and Michael Hill, B.S.1


The purpose of this pilot study was to determine whether there are markers that can be used to study the effects of grounding on delayed-onset muscle soreness (DOMS).

Design and subjects:
Eight (8) healthy subjects were exposed to an eccentric exercise that caused DOMS in gastrocnemius muscles of both legs. Four (4) subjects were grounded with electrode patches and patented conductive sheets connected to the earth. Four (4) control subjects were treated identically, except that the grounding systems were not connected to the earth.

Outcome measures:
Complete blood counts, blood chemistry, enzyme chemistry, serum and saliva cortisols,
magnetic resonance imaging and spectroscopy and pain levels were taken at the same time of day before the eccentric exercise and 24, 48, and 72 hours afterwards. Parameters consistently differing by 10% or more, normalized to baseline, were considered worthy of further study.

Parameters that differed by these criteria included white blood cell counts, bilirubin, creatine kinase, phosphocreatine=inorganic phosphate ratios, glycerolphosphorylcholine, phosphorylcholine, the visual analogue pain scale, and pressure measurements on the right gastrocnemius.

In a pilot study, grounding the body to the earth alters measures of immune system activity and pain. Since this is the first intervention that appears to speed recovery from DOMS, the pilot provides a basis for a larger study.

Voor het volledige artikel zie:

En uit 2006:
The effect of earthing (grounding) on human physiology

The European Journal of Biology and Bioelectromagnetics 31 jan 2006 pp 600-621

Gatan Chevalier1, Kazuhito Mori2, and James L. Oschman3

1 California Institute for Human Science, Graduate School & Research Center, Encinitas, CA
2 California Institute for Human Science, Graduate School & Research Center, Encinitas, CA
3 Natures Own Research Association, Dover, NH
Corresponding Author: Gatan Chevalier

Previous research (12) showed that connecting the human body to the earth during sleep normalizes circadian cortisol profiles and reduces or eliminates various subjectively reported symptoms, including sleep dysfunction, pain and stress. We therefore hypothesized that earthing might also influence other aspects of physiology.

Fifty-eight healthy adult subjects (30 controls) participated in a double blind pilot study. Earthing was accomplished with a conductive adhesive patch placed on the sole of each
foot. An earthing cord led outdoors to a rod driven into the earth. A biofeedback system recorded electrophysiological and physiological parameters.

Upon earthing, about half the experimental subjects showed an abrupt, almost instantaneous change in root mean square (rms) values of electroencephalograms (EEG) from the left hemisphere (but not the right hemisphere) and all of them
presented an abrupt change in rms values of surface electromyograms (SEMGs) from right and left upper trapezius muscles. Signal variance in rms muscle potentials also increased significantly.

Earthing decreased blood volume pulse (BVP) in 19 of 22 experimental subjects (p < 0.001) and in 8 of 30 controls (p ? 0.1, not significant); heart rate (HR) was not affected.

From these results, it appears that earthing the human body has significant effects on electrophysiological properties of the brain and musculature, on the blood volume pulse, and on the noise and stability of electrophysiological recordings. Taken together, the changes in EEG, EMG, and BVP suggest reductions in overall stress levels and tensions, and a shift in autonomic balance upon earthing. The results therefore extend the
conclusions of the previous study (12).

sleep; stress; electroencephalogram; surface electromyogram; blood volume pulse; autonomic balance

Voor het volledige artikel (18 p) zie:

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