Fig. 2
From: Effect of speed and gradient on plantar force when running on an AlterG® treadmill
Maximum plantar force [times BW] mean ± standard deviations (error bars) varies with gradient for speeds 12 & 15 km/hr. averaged. 15 km/hr. was the top speed when running the treadmill belt in reverse to get the decline trials. Therefore, the common speeds use for both incline and decline conditions have been averaged for comparison. Note non-linear relationship for negative gradient with a relative dip for the − 5° running trials