Fig. 4
From: Effects of various walking intensities on leg muscle fatigue and plantar pressure distributions
The scatter plots showing the relationship between the median frequency and MSE of EMG signals of tibialis anterior (TA) and gastrocnemius medialis (GM) and PPP at four plantar foot regions. A Median frequency of TA and PPP. B Median frequency of GM and PPP. C Complexity of TA (calculated by multiscale entropy (MSE)) and PPP. D Complexity of GM and PPP. Notes: 1st toe (T1); 1st metatarsal head (M1); 2nd metatarsal head (M2); heel (HL); P < 0.05 (*); P < 0.01 (**). Fatigue and non-fatigue conditions are relative in this study based on the shift to lower median frequency in the speeds of 3.6 and 5.4 mph compared to 1.8 mph