std for width of data,is exist function for that?

I wan to make step counter with 'findpeaks' function. Treshold for minimum height above one standard deviation are treated as a step I use 'minPeakHeight = std(magnitudeAccelerometer);'.

[pks, locs] = findpeaks(magNoG, 'MINPEAKHEIGHT', minPeakHeight)

How should I calculate teshold for minimum width in peaks , for paramater 'MinPeakDistance' to 'findpeaks' function. Is already exist this parameter(MinPeakDistance) in 'findpeaks' function. I need idea how to calculate...

My graph is look like this (I did 10 step). (I seted up the 'MinPeakDistance' to 50 manualy).