https://community.usms.org/swimming/f/open-water-training-and-technique/24600/effort-power-when-in-cold-waterbeen swiming in 50F deg water. Effort seems a lot more and tired after 30 mins with wetsuit. Normal? or just mental?en-USTelligent Community 12https://community.usms.org/thread/263756?ContentTypeID=1Thu, 15 May 2008 15:47:01 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:c0a84a66-6644-4bc5-91a9-d32860684c13Former MemberLast week I swam 1000 yards in a hot pool,...85 degrees and it sapped my energy,..it wore me out. A few days later, I swam 2.3 miles in 63 degree Ocean water,... and felt great. I wore no wetsuit,..merely kept moving,..it took an hour and a half,.I got out and had no chills. I ate well the night before ( shrimp,..salad, bread,.beer and a shot of scotch) and that morning had a bananna and hot tea. I was mentally &quot;INTO&quot; the swim before I started, and leaned into the harness during the swim,..it was fun! I do believe that a majority of the battle is in the mind.<div style="clear:both;"></div>https://community.usms.org/thread/263747?ContentTypeID=1Thu, 15 May 2008 02:41:10 GMT3187ac58-ba85-4314-b79a-c45cd885e09a:10076f19-f2cd-4306-a230-6d005fd299b4LoriI&#39;m not sure but yesterday I swam a mile in 50 degree water (with my wetsuit) and I was pretty tired even tho I usually do 3 miles in the pool. I guess staying warm takes energy. Felt great tho!<div style="clear:both;"></div>