Khowailed I1
1University of Saint Auguestine, Physical Therapy, San Marcos, United States
Background: Within the running competitive runners. Anterior PFPS affects approximately 2.5 population , anterior PFPS is the most prevalent injury among recreational and million runners a year, primarily female runners. Previous studies have shown that for runners complaining of knee pain, a protocol that focuses on strengthening the posterolateral hip has proved effective in reducing knee pain. Still, there is a lack of research on the correlation between motor recruitment activity of the GM during forefoot strike pattern and rear foot strike patterns. It is reasonable to hypothesize that the efficiency of the strike pattern would lead to less forward momentum loss and decreased likelihood of PFPS incurrence. Therefore, it is preferred that a training program should contain both strengthening interventions to the GM and measures to transition RFS runners to FFS runners.
Purpose: To examine the effect of forefoot strike running pattern on the EMG activity of gluteus medius compared to heel strike pattern of running.
Methods: 9 recreational runners, 5 FFS and 4 HS age 24.7 ± 2.49 participated in the study. Baseline MVC of the GM was taken prior to running, as well as placement of IR markers used for gait analysis. Subjects were required to run on a Noraxon treadmill with pressure sensors, and began the session with a 5 minute warm up, followed by 5 minute period of running at a self chosen pace.
EMG of GM, GRF at different phases of running, and spatiotemporal parameters were recorded during the running.
Results: Data analysis was performed during three specific phases of the gait cycle: Initial Contact, Weight Acceptance, and Push Off. For each group, EMG analysis was performed during running, and results showed that on average, the FFS runners had increased GM activation when compared the RFS runners. On average the FFS group had an EMG reading of 16.79 mV with a SD of ±12.07 mV, while the HS group had an average EMG of 15.81 mV and a SD of ± 3.68 mV. During the three phases of running that were analyzed, the phase with the largest amplitude of GM activation was during the Weight Acceptance phase of running with an average of 55.48 mV with a SD of ± 8.49mV. SD deviation between the groups showed that there was a larger measure in the FFS group when compared to the RFS group with the largest variance in SD occurring in the Weight Acceptance phase of running.
Conclusion(s): The findings of this study concluded that increased activation of the GM during initial contact and weight acceptance of forefoot strike pattern provide a biomechanical advantage to running and a decreased GRF at the knee. It is reasonable to hypothesize that the efficiency of the strike pattern would lead to less forward momentum loss and decreased likelihood of PFPS incurrence.
Implications: It is preferred that a training program should contain both strengthening interventions of the GM and measures to transition RFS runners to FFS runners.
Keywords: Running, Gluteus Medius, EMG
Funding acknowledgements: None
Purpose: To examine the effect of forefoot strike running pattern on the EMG activity of gluteus medius compared to heel strike pattern of running.
Methods: 9 recreational runners, 5 FFS and 4 HS age 24.7 ± 2.49 participated in the study. Baseline MVC of the GM was taken prior to running, as well as placement of IR markers used for gait analysis. Subjects were required to run on a Noraxon treadmill with pressure sensors, and began the session with a 5 minute warm up, followed by 5 minute period of running at a self chosen pace.
EMG of GM, GRF at different phases of running, and spatiotemporal parameters were recorded during the running.
Results: Data analysis was performed during three specific phases of the gait cycle: Initial Contact, Weight Acceptance, and Push Off. For each group, EMG analysis was performed during running, and results showed that on average, the FFS runners had increased GM activation when compared the RFS runners. On average the FFS group had an EMG reading of 16.79 mV with a SD of ±12.07 mV, while the HS group had an average EMG of 15.81 mV and a SD of ± 3.68 mV. During the three phases of running that were analyzed, the phase with the largest amplitude of GM activation was during the Weight Acceptance phase of running with an average of 55.48 mV with a SD of ± 8.49mV. SD deviation between the groups showed that there was a larger measure in the FFS group when compared to the RFS group with the largest variance in SD occurring in the Weight Acceptance phase of running.
Conclusion(s): The findings of this study concluded that increased activation of the GM during initial contact and weight acceptance of forefoot strike pattern provide a biomechanical advantage to running and a decreased GRF at the knee. It is reasonable to hypothesize that the efficiency of the strike pattern would lead to less forward momentum loss and decreased likelihood of PFPS incurrence.
Implications: It is preferred that a training program should contain both strengthening interventions of the GM and measures to transition RFS runners to FFS runners.
Keywords: Running, Gluteus Medius, EMG
Funding acknowledgements: None
Topic: Sport & sports injuries; Orthopaedics; Human movement analysis
Ethics approval required: Yes
Institution: Touro University Nevada
Ethics committee: Touro University Nevada
Ethics number: IRB7-13-16A
All authors, affiliations and abstracts have been published as submitted.
