Table 2. Within-subject correlation coefficients for rating of perceived exertion (RPE), heart rate (HR), facial normalised electromyographic (NEMG) values and lower limb NEMG values.
Male Female
HR (beatsHmin–1) RPE VL muscle (%) HR (beatsHmin–1) RPE VL muscle (%)
CS muscle (%) .414 .268†  .375 .372 0.186 .494
Masseter muscle (%) .893 .716 .794 .856 .849 .754
VL muscle (%) .740 .753 .750 .742
† : p < 0.05‡: p < 0.01; CS = corrugator supercilii; VL = vastus lateralis