1,721,109 research outputs found
Does leg predomination affect measuring vasti muscle onsets during single leg squatting? A reliability study
No full textIntroduction: although measuring vasti muscle onset may reveal whether pain relief is associated with altering this parameter during activities in subjects with patellofemoral pain syndrome (PFPS), it may be necessary to determine whether the inherent properties of the dominant leg influences the reliability of measuring VMO-VL muscle onset. The aim of the present study was to examine the effect of leg predomination on reliability testing of the VMO-VL muscle onset measurement during single leg squatting in healthy subjects.Methods: the onset of VMO and VL muscles of ten healthy subjects with a right dominant leg was assessed during single leg squatting. Data was collected from the muscle bellies of the VMO and VL. This procedure was performed on the both legs, during three separate single leg squats from a neutral position to a depth of approximately 30° of knee flexion. Subjects were then asked to repeat the test procedure after a minimum of a week's interval. The full wave rectified onsets of VMO and VL were then calculated.Results: there was no significant difference between the VMO-VL onset mean values of paired test of right and left knees. The ICC (intra class correlation coefficient) values during within and between sessions tests showed the poor reliability of these measurements on both knees.Conclusion: the low intratester reliability of within and between sessions measurement of VMO-VL onset on the both dominant and non-dominant legs revealed that repeatability of these measurements have little accepted reliability, however similar values of these measurements indicated that leg predomination does not affect the measurements during single leg squattin
Reliability testing of the patellofemoral joint reaction force (PFJRF) measurement during double-legged squatting in healthy subjects: a pilot study
No full textDoes leg predomination affect the measurement of patellofemoral joint reaction force (PFJRF) during single leg squatting?: a reliability study
No full textEvaluating the sensitivity of actimetry to detect postural changes in seated individuals
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The effect of patellar taping on joint reaction forces during squatting in subjects with Patellofemoral Pain Syndrome (PFPS)
No full textIntroduction: The mechanisms of pain reduction have not completely been established following patellar taping in subjects with patellofemoral pain syndrome (PFPS); although it might be related to alteration in the kinetics of the patellofemoral joint.Methods: Patellofemoral Joint Reaction Force (PFJRF) of eighteen subjects with PFPS and eighteen healthy subjects as controls were assessed by a motion-analysis system and one force plate. This procedure was performed on the affected knee of subjects with PFPS, before, during and finally after patellar taping during unilateral squatting. A similar procedure was also performed on the unaffected knees of both groups.Results: The mean values of PFJRF prior to taping (2025 N, SD 347 N) were decreased significantly following a period of taping (1720 N, SD 303 N) (P < 0.05). There were no significant differences between the mean values of PFJRF among controls (1922 N, SD 398 N) and subjects with PFPS prior to taping (P > 0.05) which might be due to small sample size in both groups and large variability observed in the study.Interpretation: Decreased values of PFJRF may explain the mechanism of pain reduction following patellar taping in subjects with PFPS
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