Effect of Vitamin D3 Supplementation on Cardiac Autonomic Nerve Function in Male Parkinson's Disease Patients With Hypovitaminosis D

IInclusion criteria: * Male patients with of Parkinson's disease diagnosed by neurologist with unilateral or bilateral involvement and mild to moderate disability according to Hoehn and Yahr (H-Y) scale (I-III) * Age: 51-70 years * BMI: 18.5-24.9 kg/m2 * Vitamin D3 deficient or insufficient * On Levodopa medication Exclusion criteria: 1. Patients with a history of drug abuse including alcoholism. 2. Patients on following drugs will be excluded- * Antioxidant vitamin supplements * Lipid lowering medications * Antihypertensive drug * Anti-arrhythmic drug * Sedatives 3. All patients with the history of or clinical manifestation of currently suffering from following diseases \& condition will be excluded * Severe Cardiovascular disorders * Severe neurological disorders * Severe Respiratory disorders * Severe Renal insufficiency (S. Creatinine \> 1.5 mg/dl, Acute or chronic kidney disease) * Severe Endocrine disease * Severe Arthritis * Severe Liver diseases * Severe Neoplastic disease * Severe Psychiatric disorder * Current use of iron, zinc, calcium, magnesium and multivitamin supplementation * Already performing yoga or breathing exercise * Hypercalcemia