Oschman, Chevalier, and Brown reviewed the accumulated evidence on grounding and inflammation, published in the Journal of Inflammation Research (Vol. 8, pp. 83-96). The review summarized findings from multiple experiments showing that connecting the human body to the earth alters the numbers of circulating neutrophils and lymphocytes, and also affects various circulating chemical factors related to inflammation. The proposed mechanism is that mobile electrons from the earth enter the body and act as natural antioxidants, neutralizing reactive oxygen species involved in the immune response and inflammation. The authors described case studies showing accelerated wound healing and reduced cardinal signs of inflammation (redness, heat, swelling, pain, loss of function) following grounding.

Chevalier, Sinatra, Oschman, Sokal, and Sokal compiled research across multiple disciplines showing that direct physical contact with the earth produces effects on inflammation, immune response, and wound healing. The review proposed that the earth functions as an unlimited source of free electrons, and that when these electrons enter the body through conductive contact they serve as natural antioxidants. This electron transfer was proposed to explain observed reductions in inflammation markers, improvements in blood flow, and normalization of cortisol rhythms. Published in the Journal of Environmental and Public Health.

Ghaly and Teplitz measured salivary cortisol profiles in 12 subjects before and after 8 weeks of sleeping grounded using a conductive mattress pad connected to the earth. Results showed that grounding during sleep resynchronized cortisol secretion to align more closely with the natural circadian rhythm. Nighttime cortisol levels dropped, and the daytime peak became more pronounced. Subjects also reported subjective improvements in sleep quality, pain, and stress levels. Published in the Journal of Alternative and Complementary Medicine (Vol. 10, pp. 767-776). Cortisol is a key hormone that regulates the inflammatory response, and chronically elevated cortisol contributes to systemic inflammation.

Chevalier, Sinatra, Oschman, and Delany measured the electrodynamic properties of red blood cells before and after 2 hours of grounding. Zeta potential (the electrical charge on the surface of red blood cells that keeps them from clumping) increased significantly in all grounded subjects. Higher zeta potential means red blood cells repel each other more strongly, reducing aggregation and lowering blood viscosity. Elevated blood viscosity and red blood cell aggregation are associated with cardiovascular inflammation and disease. Published in the Journal of Alternative and Complementary Medicine.

Brown, Chevalier, and Hill studied 8 subjects who performed eccentric toe raises to induce muscle soreness. Half were grounded overnight, half received sham grounding. The grounded group showed differences in white blood cell counts (fewer neutrophils), lower bilirubin, and lower creatine kinase compared to the ungrounded group. Pain scores were also lower in the grounded subjects. Creatine kinase is a marker of muscle damage, and neutrophil count reflects the acute inflammatory response. Published in the Journal of Alternative and Complementary Medicine.

Chevalier, Melvin, and Barsotti randomized 40 volunteers into grounded and sham-grounded groups in a double-blind design. After one hour, thermal imaging showed the grounded group had a significant increase in facial temperature of 0.62 degrees Celsius compared to the sham group. Increased facial blood flow via thermal imaging indicates improved autonomic nervous system regulation and reduced vasoconstriction, which is associated with inflammatory processes. Published in the journal Health (2015).

Chevalier, Patel, Weiss, and colleagues randomized 16 massage therapists (who experience high occupational physical stress) to grounded or sham-grounded sleeping pads for 6 weeks. The grounded group showed statistically significant improvements in physical function and energy, and significant decreases in fatigue, depressed mood, tiredness, and pain compared to baseline and compared to the sham group. Published in Explore (2019). Chronic pain and fatigue are closely linked to chronic low-grade inflammation.

Muller, Proller, Ferreira-Briza, Aglas, and Stoggl at the University of Salzburg studied 22 participants after intensive eccentric muscle loading (downhill running). The grounded sleeping group (n=12) showed less pronounced decreases in countermovement jump height and maximal voluntary isometric contraction, and smaller increases in creatine kinase (a marker of muscle inflammation and damage) compared to the control group (n=10). Published in Frontiers in Physiology. The results suggest grounding accelerates recovery from exercise-induced inflammation.

Sokal and Sokal conducted five separate experiments (total participants: 84 + 28 + 12 + 12 + 32) examining the physiological effects of earthing. Results showed that earthing decreased serum sodium, potassium, magnesium, iron, and total protein concentrations. It also decreased free tri-iodothyronine and decreased blood glucose levels in patients with diabetes. The authors found modulation of immune response markers. Published in the Journal of Alternative and Complementary Medicine (2011). These metabolic and immune changes are consistent with reduced systemic inflammation.

Published in the Journal of Clinical Medicine, this study randomized 84 post-spinal surgery patients into earthed (n=42) and control (n=42) groups. C-reactive protein (CRP), a key marker of systemic inflammation, changed by a median of only 0.05 mg/dL in the earthing group versus 17.2 mg/dL in the control group. The earthing group also had significantly greater reduction in Visual Analog Scale pain scores (median 2.0 vs. 1.0, p<0.01). Creatine kinase and alkaline phosphatase, markers of tissue damage and inflammation, were also significantly reduced in the earthed group.