Impact of Vitamin D3 Administration on Cardiac Autonomic Tone in Asthma Chronic Obstructive Pulmonary Disease(COPD) Overlap Patients

The intervention was given by oral administration of vitamin D3 capsule each of which contains 40000 IU of vitamin D3. The capsule was manufactured and supplied by Beximco Pharmaceutical Limited, Bangladesh. The placebo was also be manufactured and supplied by the same pharmaceutical company and was similar in size shape \& appearance to vitamin D3 capsule but contained all the ingredients of vitamin D capsule other than the vitamin D3

oral administration of placebo