Table 2.

Stride averaged normalized muscle activation ± SD normalized to the respective muscle’s average maximum value during running with the Adidas (13.0 kN/m) footwear condition.

Footwear bending stiffness (kN/m)	Tibialis anterior (%)	Soleus (%)	Medial gastroc-nemius (%)	Vastus medialis (%)	Rectus femoris (%)	Biceps femoris (%)	Gluteus maximus (%)
13.0 ± 1.0	37 ± 7	24 ± 16	24 ± 5	19 ± 2	27 ± 10	40 ± 14	31 ± 15
31.0 ± 1.5	37 ± 9	21 ± 5	26 ± 3	20 ± 3	22 ± 12	39 ± 14	28 ± 9
43.1 ± 1.6	39 ± 9	21 ± 3	28 ± 4	19 ± 4	26 ± 12	38 ± 10	23 ± 6
84.1 ± 1.1	38 ± 9	20 ± 3	25 ± 3	20 ± 3	27 ± 13	40 ± 10	26 ± 7