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Patellofemoral pain syndrome (PFPS) is a common disorder that afflicts people across all age groups, and results in various degrees of knee pain. The diagnosis of PFPS is difficult since the exact biomechanical factors and the extent to which they are affected by the disorder are still unknown. Recent research has reported significant statistical(More)
STUDY DESIGN Cross-sectional study of electromyographic onsets of trunk and hip muscles in subjects with a clinical diagnosis of sacroiliac joint pain and matched control subjects. OBJECTIVES To determine whether muscle activation of the supporting leg was different between control subjects and subjects with sacroiliac joint pain during hip flexion in(More)
BACKGROUND AND PURPOSE The purpose of this study was to investigate the effect of patellar taping on the onset of activity of the vastus medialis obliquus muscle (VMO) and the vastus lateralis muscle (VL). SUBJECTS AND METHODS Fourteen female subjects with patellar pain walked up and down stairs in two conditions: (1) with the patellofemoral joint of the(More)
OBJECTIVE Effects of obesity on trunk forward flexion motion in sitting and standing, and postural adaptations and hip joint moment for a standing work task. DESIGN Cross-sectional comparison of obese and normal weight groups. SUBJECTS Ten obese subjects (waist girth 121.2+/-16.8 cm, body mass index (BMI) 38.9+/-6.6 kg m(-2)) and 10 age- and(More)
The purpose of this investigation was to determine how the triphasic electromyogram (EMG) pattern of muscle activation developed from the agonist muscle only pattern as movement time (t mov) decreased. Six adult women produced a series of 30° elbow extension movements in the horizontal plane at speeds ranging from ballistic (< 400-ms t mov) to very slow (>(More)
OBJECTIVE This study examined the right to left symmetry of the displacement of three-dimensional movement of the human face. METHODS Displacement data on 42 subjects was collected and analyzed with the Expert Vision Motion Analysis System. Right and left three-dimensional facial displacements were quantified. RESULTS Significantly greater left than(More)
This study investigated the 3-dimensional displacement of points on the face that were thought to be still during facial movement. These points are currently used to measure displacement of moving facial regions during assessment of normal facial movement and treatment interventions following facial nerve paralysis. It is, however, unknown if these places(More)
Abnormal subtalar joint function and the consequent rotation of the tibia during walking are thought to contribute to patellofemoral pain syndrome (PFPS). The purpose of this study was to measure rearfoot and tibia motion, and the ground reaction force (GRF) during the stance phase of walking in subjects with PFPS and compare them to healthy subjects. A(More)
OBJECTIVE To investigate the postural alignment of the upper body in the sagittal plane during sitting and standing postures as pregnancy progressed and then in the postpartum period. DESIGN Longitudinal, repeated-measures design. SETTING Biomechanics laboratory in an Australian university. PARTICIPANTS A volunteer convenience sample of 9 primiparous(More)
This study was undertaken to quantify 3-dimensional (3-D) facial movement in normal subjects, and to identify the individual axes in which this movement occurred. Displacement data on 42 subjects were collected and analyzed with the Expert Vision Motion Analysis System. The 3-D displacement was calculated by vectorially subtracting maximum marker movement(More)