Deep tissue massage therapy is similar to Swedish massage, but the deeper pressure is beneficial in releasing chronic muscle tension. The focus is on the deepest layers of muscle tissue, tendons and fascia (the protective layer surrounding muscles, bones and joints).Additionally, a 2010 meta-analysis in the Journal of Clinical Psychiatry found that massage modalities like deep tissue reduce stress hormone levels and heart rate while boosting mood and relaxation by triggering the release of oxytocin and serotonin.