Zhang John, Snyder Brian J, Vernor Lori
Logan College of Chiropractic, Research Department, Chesterfield, MO 63006, USA.
J Can Chiropr Assoc. 2004 Mar;48(1):29-35.
The purpose of this study was to investigate the body surface electromagnetic field (EMF) changes using a sensitive magnetometer before and after a specific Toftness chiropractic adjustment in asymptomatic human subjects.
Forty-four subjects were randomly assigned into control (20 subjects) and experimental groups (24 subjects) in a pre and post-test design. The Triaxial Fluxgate Magnetometer FGM-5DTAA (Walker Scientific, Worcester, Massachusetts) with five digit display and resolution of 1 nanotesla (nT) was used for EMF detection. The EMF in the research room and on the adjustment table was monitored and recorded. The subjects' body surface (cervical, thoracic, lumbar and sacral areas) EMF was determined in the prone position before and after the chiropractic adjustment. A low force Toftness chiropractic adjustment was applied to the cervical, thoracic, lumbar and sacral areas as determined by the practitioner.
The EMF in the research room was recorded as 41611 nT at the Z axis (earth field), 13761 nT at the X axis and 7438 nT at the Y axis. The EMF on the adjusting table changed minimally during the 15 minute observation period. The EMF on the subjects' body surface decreased at 4 spinal locations after chiropractic adjustment. The EMF (mean +/- SD in nT) decreased significantly at the cervical region from 42449 +/- 907 to 41643 +/- 1165 (p < 0.01) and at the sacral regions from 43206 +/- 760 to 42713 +/- 552 (p < 0.01). The EMF at the lumbar and thoracic regions decreased but did not reach a statistically significant level. No significant changes of the body surface EMF were found in the control group.
A low force Toftness chiropractic adjustment in the cervical and sacral areas resulted in a significant reduction of the cervical and sacral surface EMF. No significant body surface EMF changes were observed in the lumbar and thoracic regions. The mechanisms of the EMF reduction after chiropractic adjustment are not known.
本研究旨在使用灵敏的磁力计，调查无症状人体受试者在进行特定的托夫尼斯整脊调整前后体表电磁场（EMF）的变化。
采用前后测试设计，将44名受试者随机分为对照组（20名受试者）和实验组（24名受试者）。使用具有五位数字显示且分辨率为1纳特斯拉（nT）的三轴磁通门磁力计FGM-5DTAA（沃克科学公司，马萨诸塞州伍斯特）进行EMF检测。对研究室和调整台上的EMF进行监测和记录。在整脊调整前后，让受试者俯卧位，测定其体表（颈部、胸部、腰部和骶部区域）的EMF。由从业者对颈部、胸部、腰部和骶部区域进行低力度的托夫尼斯整脊调整。
研究室中的EMF在Z轴（地磁场）记录为41611 nT，X轴为13761 nT，Y轴为7438 nT。在15分钟的观察期内，调整台上EMF的变化极小。整脊调整后，受试者体表4个脊柱位置的EMF降低。EMF（以nT为单位的平均值±标准差）在颈部区域从42449±907显著降至41643±1165（p<0.01），在骶部区域从43206±760降至42713±552（p<0.01）。腰部和胸部区域的EMF降低，但未达到统计学显著水平。对照组未发现体表EMF有显著变化。
对颈部和骶部区域进行低力度的托夫尼斯整脊调整可导致颈部和骶部表面EMF显著降低。在腰部和胸部区域未观察到体表EMF有显著变化。整脊调整后EMF降低的机制尚不清楚。
