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  • Title: Effect of foot orthotics on quadriceps and gluteus medius electromyographic activity during selected exercises.
    Author: Hertel J, Sloss BR, Earl JE.
    Journal: Arch Phys Med Rehabil; 2005 Jan; 86(1):26-30. PubMed ID: 15640985.
    Abstract:
    OBJECTIVE: To compare electromyographic activity of the vastus medialis, vastus lateralis, and gluteus medius during functional activities in subjects with different foot types while wearing various off-the-shelf foot orthotics. DESIGN: Experimental, controlled; 3 foot-type groups (pes planus, pes cavus, pes rectus) each tested in 4 orthotic conditions while performing 3 different exercises. SETTING: Laboratory. PARTICIPANTS: Thirty healthy young adults, 10 with each foot type. INTERVENTIONS: Four conditions: no orthotic, 7 degrees medial rearfoot post, 4 degrees lateral rearfoot post, and neutral rearfoot post. MAIN OUTCOME MEASURE: Surface electromyographic activity for the vastus medialis, vastus lateralis, and gluteus medius during single-leg squatting, lateral stepdown, and maximum vertical jump exercises. RESULTS: Greater vastus medialis and gluteus medius activity was found with all 3 orthotic conditions, regardless of subject foot type, during the single-leg squat and lateral stepdown. Less vastus lateralis activity was found with the vertical jump with all orthotic conditions, again regardless of foot type. CONCLUSIONS: During slow controlled exercises such as the single-leg squat and lateral stepdown, vastus medialis and gluteus medius activity may be enhanced with an off-the-shelf orthotic, regardless of posting or foot type. These same findings do not appear to carry over to a more explosive task such as the maximal vertical jump.
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