The Present Study Examine the Effect of High Altitude Exposure on Heart Rate. In This Study, High Altitude Exposure Includes, Height Gain at the Particular Altitude and Duration In Days That Has Been Spent At the High Altitude. For This Study, 43 Healthy Male Individual Participated In Mountaineering Training Program Were Selected As the Subject For This Study and Age Ranged from 17-45 Yrs. Single Group Repeated Measure Design Was Used. Analysis of Variance (Rm Anova) Was Used Analyzed Collected Data. from The Result of the Study, It Can Be Concluded That Exposure to High Altitude Significantly Affects Heart Rate