Originally Posted by
JAK
I've been doing my own experiment of one, trying to figure out how much faster and farther I might hike and run as I lose weight and get into better shape. Its a bit of a race against time because I am also getting older and will be turning 50 next June.
Speed: My own experience seems to confirm that for moderate running and hiking speeds, for the same effort and duration and fitness level, speed is more or less linear with total weight on feet. So if you drop from 240 pounds with clothing and gear, down to 180 pounds with clothing and gear, you should be able to cover about 24 miles in the same time and calories you would have covered 18 miles.
Distance Per Day: Distance per day is a little harder to figure out, especially over several days or weeks. This is because the wear and tear on muscles and the rate at which you can repair that microdamage is a little more complicated than energy in and energy out. I know from running that if I slow down my average running speed by 10% I can run considerably more miles per week, but how much? Is it 10%, 20%, 30%, or maybe only 5%. Same with hiking. Harder to get good data on it though, because we are talking about the long term, like days or weeks, and there are so many variables. Also, different things come into play over different time spans, and running or hiking speeds. Sometimes the limiting factor is cardiovascular fitness and muscle strength and stamina. At slower speeds the energy stores and how fast they can be resupplied might come into play, but for myself I am more limited by how fast my msucles can repair themselves.
Currently I am 210 pounds, hike with about 10-30 pounds skin out, depending on the season, and can cover about 60km in 3 days on the very rugged Fundy Footpath, and probably keep going at that rate for weeks if I had one rest day in 7. Not sure. I would assume that if I was 165 with 15 pounds of gear, at the same fitness level, I might be able to do 20 miles a day in average AT conditions, but again, not sure.