Effects of detachable forefoot outsole angles and shapes on muscle activity of the lower extremity during downhill walking Haeng-Seob Lee, Jae-Hu Jung

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1 Effects of detachable forefoot outsole angles and shapes on muscle activity of the lower extremity during downhill walking Haeng-Seob Lee, Jae-Hu Jung, & Woen-Sik Chae* Kyungpook National University [Purpose] [Methods] Ω [Results] [Conclusion] Key words:

3 EVA (Ethylene-Vinyl Acetate) Fig. 3. Different types of outsole angles SBR (Styrene Butadiene Rubber) Fig. 1. Material for the forefoot of shoe outsole 20 X Z 20 Y sync LED Fig. 2. Stair descending gait Fig. 4. Experimental equipment

4 Table 1. Electrode placement for selected muscles Muscle RF BF TA MG LG ES Electrode placement 50% of distance between ASIS and apex of patella 50% of distance between ischial tuberosity and caput fibula 35% of distance between patella bottom and lateral ankle joint space 35% of distance between medial knee joint space and calcaneal tuberosity 30% of distance between lateral knee joint space and calcaneal tuberosity 2 cm from the spine over the muscle mass Ω

5 Table 2. Average IEMG during initial double limb stance (unit: % RVC) * B-Type* * ES RF VM VL BF TA M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD Fig. 5. Average IEMG in the RF during IDLS MG LG M SD M SD M SD M SD `0.08 Fig. 6. Average IEMG in the MG during IDLS

6 Table 3. Average IEMG during initial single limb stance (unit: % RVC) ES RF VM VL BF TA MG LG M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD Table 4. Average IEMG during terminal double limb stance (unit: % RVC) ES RF VM VL BF TA MG LG M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD * Fig. 7. Average IEMG in the RF during TDLS

7 Table 5. Average IEMG during terminal single limb stance (unit: % RVC) ES RF VM VL BF TA MG LG M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD M SD * Fig. 8. Average IEMG in the VL during TSLS

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