The description of the influence of different Asanas, Pranayam, Meditation, Bandh and Yogic exercises practised in India as well as abroad was published in Science study Yoga.
Electromyography (EMG) is the technique for evaluating and recording the electrical activity produced by skeletal muscles. With the help of EMG muscular activity, flexibility, muscular pressure and muscular changes during yoga have been studied.
Electrocardiography (ECG) is the technique for evaluating the electrical activity of the heart, measures the rate and regularity of heartbeats as well as the size of heart chambers etc. With the help of ECG the control generated over heart and blood pressure by yogic activity can be measured. Lungs, breath control and lung capacity has been investigated during yogic activities. Gland and nerve centre related experiments have been successfully conducted during practice of yogic exercises. Practise of Ardha Sarvangasan, Pavanmuktasana and Shavasan for heart patients and high blood pressure patients at Saubhag Nature Cure Treatment and Research Centre-Ajmer have proved to be very much beneficial.
Dr. Laxmikant from Medical College, Madras has succeeded in getting back the strength and alertness in his heart patients and the patients of high blood pressure with Shavasana. The patients possessing stronger hearts were benefitted with Halasana and Sarvangasan. All the patients succeeded in sleeping better. Mr. Julian, the director of Third Clinic of Poland, has studied the influence of Shirshasana by ECG, X-ray and other medical instruments. The X-ray reports brought him to the conclusion that heart does not experience any type of pressure during the practise of Shirshasana.
Yogasanas are especially effective in the eradication of crime. Reports from jails, where yoga is being practiced, tell us that yogic exercises have proved to be supportive and beneficial in curing the root cause of physical, psychic, psychosomatic and other ailments among the inmates.