Placebo:
An inactive pill or sham procedure given to a participant in a research study as part of a test of the effects of another substance or treatment. Scientists use placebos to get a true picture of how the substance or treatment under investigation affects participants. In recent years, the definition of placebo has been expanded to include such things as aspects of interactions between patients and their health care providers that may affect their expectations and the study's outcomes.Qi:
A Chinese term for vital energy or life force. In traditional Chinese medicine, qi (pronounced "chee") is believed to regulate a person's spiritual, emotional, mental, and physical balance, and to be influenced by the opposing forces of yin and yang.Traditional Chinese medicine (TCM):
A whole medical system that was documented in China by the 3rd century B.C. TCM is based on a concept of vital energy, or qi, that is believed to flow throughout the body. It is proposed to regulate a person's spiritual, emotional, mental, and physical balance and to be influenced by the opposing forces of yin (negative energy) and yang (positive energy). Disease is proposed to result from the flow of qi being disrupted and yin and yang becoming unbalanced. Among the components of TCM are herbal and nutritional therapy, restorative physical exercises, meditation, acupuncture, and remedial massage.NCCAM Publication No. D003
Date Revised: December 2004
