Background: Studies have shown that alpha motor neurons (?MN) serving skeletal muscles are hyperexcitable in presence of spasticity and can be activated by inputs that would normally evoke a response. There is activation of gamma motor neurons (gMN) for the degree of ?MN activation thus to analyze its effect on spasticity, H reflex is used. Various modalities are used to reduce spasticity, cooling and sustained passive stretching is two of them. Studies have been conducted to find out efficacy of each but a comparative study to find out post 24 hours effect of them has not been performed. Objectives: To find out Post 24 hours effects of application of cooling and sustained passive stretch on reduction of spasticity using H reflex and comparing the two techniques to find out which is more effective. Method: Thirty patients (male=21, female=09) were selected between the age group 40-70 years with spastic hemiplegia due to cerebrovascular accident. The average time since the onset of hemiplegia was 9.23?8.36 months and the patients were selected for the study from the OPD of physiotherapy department, they were divided into two groups with 15 patients in each group The affected side of the patient was considered as Study group A Cooling was given and Study group B Sustained Passive Stretching was given along with routine rehabilitation. H reflex was used as outcome measure to test spasticity in all the patients at pre and post 24hrs. Results: Our study did not find any statistically significant difference between cooling and sustained passive Stretching for reducing the hypertonicity in triceps surae muscles (p