Big Endian wrote:
h2ofun wrote:
Honest question, do my TT tests the last week showing 10% more power on 145's and 150's compared to 170 and 175 mean nothing? Again, honest question since this stuff is all over my head.
To me, they don't mean as much as you want them to. About half your data is made ambiguous by riding with power cranks enabled. Another half of the remainder is then made ambiguous by whether or not it's your first or second effort of the day. Then, the first three records note a 50/16 gear ratio and the others 50/14, and on top of that you're changing the bar height on a daily basis. Lastly, you're investigating a heart rate relationship, which is known to be variable by several BPM on a daily basis regardless of what else is going on. Getting good data is hard at any time, but you can make it easier when you don't change anything except for the ONE thing you are investigating.
If I was doing this test I would do a week of daily A/B/A/B tests. On one day, do the long cranks first, on the next day do the short cranks first. Do not change the bar heights. Do not change your seat adjustment other than the 25mm difference. Only go between the two crank lengths you're investigation. Only do tests with locked cranks. Do all rides exclusively and completely in aero. Do a proper zero calibration on the Velotron every day.
Assuming I log 100% accurate, which I have made mistakes, I am doing 14 since I wanted to get near 70 rpm and be able to survive. I found if I went to a 50/12, the rpm I could try and push went below 70 and the watts went way up, I could not do. But at 50/14, I spin around 75 rpm. Again, the more data I get, the more we can see if there is a trend.
We are not looking at HR at all anymore at the moment.
I am switching between long or short, where I start, each day as the data shows. We have yet to settle in on what crank lengths yet, since we are still trying to find where I break. You sound like you know when short is too short. I have yet to see data that lets me agree with you. That is why Frank is sending me out an adapter so I can try 140 and 135 and see what happens. I will not even guess so I have been wrong to this point.
I can spin PC's just like regular cranks, so for me, makes no difference. But, I did not a good amount of the tests locked. Even now, only the 150's on one test are PC mode. The other bike they are locked. So, would you expect the PC bike or locked bike to give greater power?
The velotron NEVER needs to be calibrated. It is always 100% the same.
Now I do try to calibrate myself the same each day, which is why I start with a 160-300 watt, 10 watt ramp per minute, then 5 minutes of 150 spin. This always gives me the exact same 20 minute warmup before I go into test mode.
I guess I am still out to lunch, but am listening to your inputs. I am doing more aero now and am concerned about can my back take it!! I still do not see what an A/B/A/B test would give me. And I just only have so much time I can do with testing, and still deal with the rest of my real life. Lets have Frank comment on this since over my head, again. :)
Thanks for the questions. Please keep asking since I am asking also. So, what do you think the results will be when I try 140 and 135 crank length?
Dave Campbell |
Facebook |
@DaveECampbell |
h2ofun@h2ofun.net Boom Nutrition code 19F4Y3 $5 off 24 pack box |
Bionic Runner |
PowerCranks |
Velotron |
Spruzzamist Lions don't lose sleep worrying about the sheep