Background: According to the traditional wisdom of yoga, pranayama is the key to bringing about psychosomatic integration and harmony. It has been proven beyond doubt that pranayama is very important means for preventing and curing many ailments. Pranayama brings several physiological changes in the body.

Aim: The aim of the present study is to investigate the effects of ten weeks pranayama training on selected pulmonary functions of pre-adolescent boys.

Method: For the purpose of the study 30 male students were selected randomly as subjects from Jawahar Navodaya Vidyalaya, Banipur, North 24 Parganas, West Bengal, India. Age of the students ranges from 11 to 13 years. All the subjects were divided randomly in to experimental and control groups equally. Experimental group received pranayama training for ten weeks. Data were collected before and after ten weeks of training. Peak expiratory flow rate was measured by peak flow meter and respiratory rate was measured by palpation of chest movement for one minute.

Result: ANCOVA was applied to calculate the collected data at 0.05 level of significance and to identify the significance difference on experimental and control groups the mean critical difference was used as a post-hoc test. Significant difference was found between experimental and control groups on peak expiratory flow rate and respiratory rate.

Discussion: After ten weeks of pranayama training experimental group improved significantly on peak expiratory flow rate and respiratory rate.

Conclusion: From the above result it was concluded that ten weeks of pranayama training had a significant positive effect on pulmonary functions of pre-adolescent boys.