Naturopathic Doctor Muscle Testing near me in Sterling Heights, Michigan. Applied Kinesiology (Muscle Testing) (AK), also known as muscle strength testing, is a method of diagnosis and treatment based on the belief that various muscles are linked to particular organs and glands. That specific muscle weakness can signal distant internal problems such as nerve damage, reduced blood supply, chemical imbalances, or other organ or gland problems. Practitioners contend that by correcting this muscle weakness, you can help heal a problem in the associated internal organ. Muscle testing is also a great tool to determine if a herb or supplement works for your body.