1) Vocal toning
We define vocal toning as the practice of producing sustained sounds with the voice. Vowels are often preferred because they provide a broader vibration throughout the body.
The deep breathing associated with toning exercises facilitates the parasympathetic function of the nervous system, which regulates its nourishing and restorative functions.
Other positive effects include the release of oxytocin (1) and endorphins (2), as well as the potential to facilitate limbic deactivation, relevant for the treatment of depression and epilepsy (3).
2) Singing bowls
Although metal singing bowls have been around for thousands of years, their use as a therapeutic tool is not documented in ancient texts, despite the assumption that their use in vibration therapy is also ancient. They are often called Tibetan singing bowls, but a more appropriate name would be Himalayan singing bowls, as most bowls are produced in Nepal, India and China. I prefer to call them Metal Singing Bowls. They can be used directly on the body, listened to and used around the body.
Quartz crucibles made from silica, also called Crystal Singing Bowls, are a more recent invention that has gained great popularity.
Singing bowls have proven to be an effective intervention to reduce feelings of tension, anxiety and depression and increase spiritual well-being (4).
3) Tuning forks
Tuning forks can be used in different ways: directly on the body (also on acupuncture points to replace needles); close to the ears for a listening experience; around the body to influence the electromagnetic field (also known as biofield).
Tuning forks have been observed to help balance the cycles of nitric oxide (NO), an important neurotransmitter that regulates free radical levels (5)(6).
4) Binaural beats
Binaural beats are often included in lists of sound therapies, although they do not use the physical vibration of sound. In fact, this technique relies mainly on the use of headphones that allow you to listen to two tones of different frequencies, one in each ear. This is intended to induce a synchronization of the cerebral hemispheres and a response in the brain wave activity.
The overall effects may include deep relaxation, improved sleep quality, and improved focus (7).
5) Sound baths
A Sound Bath is a restorative meditative practice that involves exposure to the sounds of the instruments mentioned above (as well as other instruments, including musical instruments). The purpose of this exercise (usually a group event) is to focus attention on the sounds that reach the body and ears with presence and awareness. The effects can range from deep relaxation to an energetic feeling.