Most types of massage, with the exception of some traditional Chinese medicine are not regulated in China. Although illegal in China, some of the smaller businesses are fronts for prostitution. J.K., anti-prostitution operation has established sting operations to combat the situation. These are called falangmei (发廊妹 "hairdressing salon sisters").
Since deep tissue massage is designed to work on the deep layers of tissue in the body, it also has an impact on your blood flow. In 2008, a study was conducted with 263 volunteers with an average age of 48.5 years who were suffering from moderate or severe muscle strain. Each patient was given a deep tissue massage for 45-60 minutes. Blood pressure readings showed a dip when compared to readings taken before the massage indicating that deep tissue massage has a positive impact on lowering blood pressure.1 Though the exact mechanism of how this happens needs more study, you could use deep tissue massage as part of a holistic approach to treating hypertension.