3 ms·

We use a phone to measure the acceleration, which in general is either kept in the breast pocket or a pants pocket. In this case it's a pants pocket that is rig

We use a phone to measure the acceleration, which in general is either kept in the breast pocket or a pants pocket. In this case it's a pants pocket that is right above the knee. You're right, your body works as a spring, and it attempts to transmit the full force over as long a period as possible. But you can see from the graph that this takes 60ms. The different in acceleration that you're talking about pretty minimal. Regardless of how good your knees and ankles are at absorbing shock, if you don't clear the tranny (part of the jump where it begins to slope down) you're effed. More than anything, the point is that they're absorbing a ton of shock.

hugh3 15y ago
I'd like to see how the recorded numbers vary depending on the location of the accelerometer. Loose phone in pocket vs phone strapped tightly to the head vs phone strapped tightly to the board. That'd be some interesting science. With a phone in a pants pocket, are you sure you're not just looking at the spike when the phone, loose in the pocket, hits the edge of the pocket? The longer-term gee factors, which are what I assume you're really interested in (ie the acceleration during a turn) should still be accurate, but I'm not yet convinced that the shock data is meaningful.