Medicine and Health Sciences Commons^™

Effect Of Frontal Plane Foot Position On Lower Extremity Muscle Activation And Limb Positioning In A Single Leg Squat, Brian Bolin

Physical Therapy Scholarly Projects

Purpose: There is a high prevalence of ACL injury in the athletic populations, which can carry out short and long term debilitative effects. Most ACL injuries involve minimal to no contact and female athletes sustain a two to eightfold greater rate of injury than male athletes. Not much research has been conducted to see if foot position directly affects the lower extremity muscles, which could result in altered biomechanics at the knee.

Methods: Twelve subjects 18-30 years old participated in the study. EMG analysis measured differences of muscle contractions for the gluteus maximus, gluteus medius, biceps femoris, rectus femoris, lateral …

Effect Of Frontal Plane Foot Position On Lower Extremity Muscle Activation And Limb Positioning In A Single Leg Squat, Brady Stokes

Physical Therapy Scholarly Projects

PURPOSE: Anterior cruciate ligament (ACL) injuries at the knee are quite common, especially in the athletic population involved in sports in which jumping, landing, and cutting activities occur frequently. Previous studies have suggested that lower extremity muscle control plays a role in preventing these injuries. This study set out to determine if foot position influences muscle activation in the lower extremity and, by extension, possibly contributes to the risk of ACL injury. This project examined the activity of lower extremity muscles and the kinematics (movement patterns) of the lower extremity in various foot positions during a single-leg body lowering action. …

Effect Of Frontal Plane Foot Position On Lower Extremity Muscle Activation And Limb Positioning In A Single Leg Squat, Elizabeth J. Kornkven

Physical Therapy Scholarly Projects

Purpose/Background: Foot positioning during a single leg landing may affect the muscles above the ankle joint and promote positions of increased vulnerability to ACL injury. The purpose of the study was to analyze muscle activity of six muscles in the lower extremity during completion of a single leg squat on the subject’s dominant leg with the subtalar joint in 5 different positions.

Methods: Seventeen healthy males and females (ages 18‐30) performed five single leg squats in five foot positions: neutral, five degrees and ten degrees of declination, and five degrees and ten degrees of inclination. Electromyography data was collected from …

Influence Of Foot Position On Lower Extremity Muscle Activity, Hayley J. Letvin

Physical Therapy Scholarly Projects

Being that the anterior cruciate ligament (ACL) is the most commonly torn ligament, much research has been performed regarding this matter. Females have been found to be more likely to tear their ACL. This may be due to strength, structural (anatomical), hormonal, and neuromuscular differences compared to men. Several studies have also been conducted to help improve preventative measures with using strengthening and neuromuscular training programs. Many speculations have been made about the precipitating factors of an ACL injury. The general consensus in regard to foot placement is that the foot is usually placed in pronation during an ACL tear. …

Influence Of Foot Position On Lower Extremity Muscle Activation, Casey Darling

Physical Therapy Scholarly Projects

The anterior cruciate ligament (ACL) in the knee is often sprained or torn in injuries resulting from jumping, cutting, or hyperextension of the knee. When the knee is put under a valgus, varus, or rotatory stress it can put strain on the ACL. Lower extremity motor control can help control the amount of varus and valgus stress on the knee. Lower extremity muscle control is involved with preventing this stress and resulting injuries. This study was performed to determine whether the position of the foot (neutral, supination, and pronation) has an effect on lower extremity muscle activity during single-leg squats. …

Effect Of Frontal Plane Foot Position On Lower Extremity Muscle Activation And Limb Positioning In A Single Leg Squat, Marissa N. Laddusaw

Physical Therapy Scholarly Projects

Purpose/Background: This goal of this study was to reach a bottom up understanding of ACL injury occurrence. Subtalar position during single leg stance may affect the muscles associated with the knee joint and promote ACL injury. The muscle activity of six muscles of the leg, thigh, and hip were analyzed during a single leg squat with the foot on surfaces of 10 degrees decline, five degrees decline, neutral, and 5 degrees incline, and 10 degrees incline.

Methods: Seventeen healthy participants between the ages of 18 and 30 performed five rhythmically timed repetitions of single leg squats on surfaces of 10 …

Influence Of Foot Position On Lower Extremity Muscle Activation, Erin L. Wessman

Physical Therapy Scholarly Projects

With sports participation be it from children, teenagers, or adults; injuries will occur. In 2008-2009 an increase in high school sports participation was at an all-time high increasing to just above 7.5 million. Within this population, knee injuries ranked 3rd, with anterior cruciate ligament (ACL) injuries ranking 4th among all knee injuries. The purpose of this study was to compare muscle activation of six lower extremity muscles in five different foot positions during a single-leg squat in attempts to associate a certain foot position with an increase/decrease in muscle activation, which could then be proposed as a risk factor for …

Muscle Activity In Lower Extremity During Single-Leg Squat: Role Of Supination And Pronation, Brett J. Debele

Physical Therapy Scholarly Projects

Introduction: Literature has consistently reported a high prevalence of ACL injury rates. A correlation between excessive subtalar joint pronation and ACL injury rates has been noted but research into plausible reasons for this relationship is limited. The purpose of this study was to establish potential cause-and-effect relationships between foot position and ACL injury risk.

Methods: This study used single leg squats with simulated foot positions and examined resulting knee joint forces from motion and lower extremity muscle activation patterns that may cause ACL injury risk. Methods: This study recruited male and female participants aged 18 to 30 from campus at …