Original guide and demonstrations
These instructions describe the earlier application. The calculator above provides the current workflow.
Here's a link to the "how-to" video
https://youtu.be/0-ZETzlDqFg
Data analysis & research workflow
Rate of force development
Calculate average force increase over 50, 100 and 200 milliseconds from a time–force trace, with an explicit onset time and downloadable results.
FORCE–TIME ANALYSIS
Rate of force development
Paste a time–force trace, mark contraction onset and compare average force increase over the first 50, 100 and 200 milliseconds.
Methodological reference: Maffiuletti et al. ↗No data upload.
Calculation and acquisition choices
Average RFD = [force at onset + window − force at onset] ÷ window duration. The calculator linearly interpolates the two boundary forces, preserves input units and applies no filtering or automatic onset detection. Choose onset from the recorded trace using your study protocol. Results depend on onset, sample rate, filtering and pretension; this implementation is not an equivalence-validated replacement for the retired server.