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I am analyzing force-time data from a CMJ (100 Hz) in Python to calculate jump height, takeoff velocity, peak force, and RSI_mod. However, I am encountering the following issues:
Jump Phase Detection – The script struggles to accurately detect takeoff and landing using force thresholds (90% BW for takeoff, 110% BW for landing). The identified phases don’t align well with the force-time curve, affecting subsequent calculations.
Takeoff Velocity & Jump Height – Using the impulse-momentum method, takeoff velocity sometimes turns out negative or zero, leading to unrealistic jump heights. The issue may stem from incorrect impulse calculation or force integration.
Peak Force Before Takeoff – The script aims to find the peak force within 200ms before takeoff but sometimes selects an incorrect value, possibly due to improper indexing or filtering artifacts.
I have applied a Butterworth low-pass filter and adjusted thresholds, but the issues persist. How can I:
Improve jump phase detection to correctly identify takeoff and landing?
Ensure accurate takeoff velocity using the impulse-momentum method?
Reliably detect peak force before takeoff?
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