Have you heard of Occam's Razor?
You're looking for a complex answer to a simple problem.
Gaming the treadmill? Velocity/weight ratio screwing up the treadmill? Push/pull runners? Why make it complicated? There's no reason to look for these "complicated" explanations until you eliminate the known factors that clearly cause your observations. Once you've done that, if you are STILL seeing a significant discrepenacy, then maybe these are a factor...but, I doubt it.
Running at 0% grade is MUCH easier than running outside. Known fact. Reset your treadmill to 1.5%.
Running in a cool room with 20mph air blowing on you is NOTHING like running outside in 90F heat with just the 8 mph wind from running. You get that dreaded 5mph tailwind...and now you have what feels like ZERO air cooling at all. The heat makes it feel harder, and makes your heart beat faster to pump more blood to your skin to aid cooling. Further, sweat rate in that heat will be MUCH higher, which also will cause an elevated HR as you dehydrate...several BPM per pound of unreplenished sweat-loss.
Treadmills are notoriously inaccurate. Get a footpod, and calibrate it to GPS running outside. Use that to compare treadmill pace to outdoor pace. Note, this will still have some error because the mechanics are a little difference when you don't have forward motion....and will only work for similar paces....eg LSD pace.
So, if you want to compare treadmill to outside, you have to:
1. Set the treadmill to 1.5% to replicate level ground.
2. Replicate the climate conditions inside/outside (same wind, heat-index = temperature + dew point).
3. Use a calibrated pace measuring device (footpod) and run at that calibrated pace.
I alternate between treadmill (I own one) and outdoors all the time (sometimes every other run in a week). When I do all of the above, and see remarkable consistency between the two. When I cannot control the conditions (its hot/humid as f*** outside)...I just accept that the data is skewed---then I run based on feel and let HR do whatever it does.
You're looking for a complex answer to a simple problem.
Gaming the treadmill? Velocity/weight ratio screwing up the treadmill? Push/pull runners? Why make it complicated? There's no reason to look for these "complicated" explanations until you eliminate the known factors that clearly cause your observations. Once you've done that, if you are STILL seeing a significant discrepenacy, then maybe these are a factor...but, I doubt it.
Running at 0% grade is MUCH easier than running outside. Known fact. Reset your treadmill to 1.5%.
Running in a cool room with 20mph air blowing on you is NOTHING like running outside in 90F heat with just the 8 mph wind from running. You get that dreaded 5mph tailwind...and now you have what feels like ZERO air cooling at all. The heat makes it feel harder, and makes your heart beat faster to pump more blood to your skin to aid cooling. Further, sweat rate in that heat will be MUCH higher, which also will cause an elevated HR as you dehydrate...several BPM per pound of unreplenished sweat-loss.
Treadmills are notoriously inaccurate. Get a footpod, and calibrate it to GPS running outside. Use that to compare treadmill pace to outdoor pace. Note, this will still have some error because the mechanics are a little difference when you don't have forward motion....and will only work for similar paces....eg LSD pace.
So, if you want to compare treadmill to outside, you have to:
1. Set the treadmill to 1.5% to replicate level ground.
2. Replicate the climate conditions inside/outside (same wind, heat-index = temperature + dew point).
3. Use a calibrated pace measuring device (footpod) and run at that calibrated pace.
I alternate between treadmill (I own one) and outdoors all the time (sometimes every other run in a week). When I do all of the above, and see remarkable consistency between the two. When I cannot control the conditions (its hot/humid as f*** outside)...I just accept that the data is skewed---then I run based on feel and let HR do whatever it does.
Last edited by:
Tom_hampton: May 26, 17 13:27