Efeito do Tape McConnell na Inibição da Actividade Electromiográfica do Vasto Lateral


Introduction: Patellar taping is frequently used by physiotherapists to reduce pain and enhance neuromuscular recruitment in patients with patellofemoral disorders. Its application can lead to an inhibition or facilitation of the neuromuscular activity; therefore, the vastus lateralis inhibition taping technique is commonly introduced in the rehabilitation program to induce an inhibition in the vastus lateralis muscle and create neuromuscular balance. Purpose: Evaluate the effect of the vastus lateralis inhibition taping technique on electromyographic (EMG) activity in the vastus lateralis (VL), vastus medialis obliquus (VMO) and VMO/VL ratio. Relevance: The development and research of the effectiveness of the inhibition techniques in the patellafemoral rehabilitation program is a current need in the physiotherapy intervention. Methodology: Thirty young healthy women (20±1.5 years) without patellofemoral pain syndrome volunteered for this study. Electromyographic activity was collected during an isometric muscular contraction made at 30 and 45 degrees of the knee flexion performed in the squat exercise, with and without vastus lateralis inhibition taping Results/discussion: In spite of the results suggesting a decrease in the EMG activity of the VL in both amplitudes evaluated, this difference was only statistically significant at 30 degrees of the knee flexion (p=0.01). There were no statistically significant differences in the EMG activity of the VMO (p>0.05) muscle and VMO/VL (p>0.05).Conclusions: The vastus lateralis inhibition taping technique might lead to a decrease in the electromyographic vastus lateralis activity; as a result, this intervention must be used in the rehabilitation of the patellofemoral dysfunction. However, further research is needed to evaluate the effectiveness of the vastus lateralis inhibition taping in the presence of the patellafemoral pain syndrome.

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    ABSTRACT: The current study is aimed at examining the validity of five clinical patellofemoral tests used in the diagnosis of patellofemoral pain syndrome (PFPS). Forty-five knee patients were divided into either the PFPS or the non-PFPS group, based on the fulfilment of the diagnostic criteria for PFPS. An investigator, blinded to the group assignment, performed the vastus medialis coordination test, patellar apprehension test, Waldron's test, Clarke's test, and the eccentric step test. The positive likelihood ratio was 2.26 for both the vastus medialis coordination test and the patellar apprehension test. For the eccentric step test, the positive likelihood ratio was 2.34. A positive outcome on either the vastus medialis coordination test, the patellar apprehension test, or the eccentric step test increases the probability of PFPS to a small, but sometimes important, degree. For the remaining tests, the positive likelihood ratios were below the threshold value of 2, indicating that given a positive test result, the probability that the patient has PFPS is altered to a small, and rarely important degree. The negative likelihood ratios for all tests exceeded the threshold value of 0.5, suggestive of clinically irrelevant information. These data question the validity of clinical tests for the diagnosis of PFPS.
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    ABSTRACT: This study was conducted to investigate the effects of Jenny McConnell's vastus lateralis (VL) inhibition taping technique on VL and vastus medialis obliquus (VMO) muscle activity, and its possible application in quadriceps rehabilitation, particularly in patellofemoral pain syndrome.Eighteen asymptomatic subjects (11 female and 7 male) participated, and completed a functional task (stair descent) under three test conditions: no tape, placebo tape and active tape.Surface electrodes were used to determine the electromyographic activity of VL and VMO during the tests.High variance and abnormal distribution meant that the data required non-parametric analysis, which was completed with Friedman and Wilcoxon tests for each muscle. Results of the Friedman test for VL revealed a significant difference in activity across the conditions (p < 0.05). Further investigation with the Wilcoxon tests revealed that the application of the active tape was responsible for significantly decreasing VL activity. The Friedman test on VMO activity revealed no significant difference between experimental conditions (p > 0.05), although a Wilcoxon test between the placebo tape and active tape conditions was significant.These findings suggest that McConnell's VL inhibition taping technique does inhibit VL, but the effects of this inhibition on VMO require further investigation.
    Physiotherapy 04/2000; 86(4-86):173-183. DOI:10.1016/S0031-9406(05)60960-1 · 1.91 Impact Factor
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    ABSTRACT: In this study, the effect of dynamic stabilizers on the patellofemoral (PF) joint was investigated in normal volunteers (group I) and in patients with patellar pain (group II) or instability (group III) by using computed tomography (CT) analysis and integrated electromyography (iEMG) of the quadriceps muscle. Nine subjects (16 knees) from group I, 10 patients (12 knees) from group II and 8 patients (12 knees) from group III were included in the study. CT scans of the PF joint with quadriceps contracted (QC) and uncontracted (QU) and iEMG of vastus medialis obliquus (VMO), vastus lateralis (VL) and rectus femoris (RF) were obtained with the aid of a specially designed jig at 0 degree, 15 degrees, 30 degrees and 45 degrees of knee flexion. The same muscle contraction pattern simulating closed kinetic chain exercise was used for both CT and iEMG. The difference between the congruence angles (CA) and tilt angles (PTA) in QC and QU positions and VMO:VL ratio from the iEMG were calculated separately for each flexion angle. CA was increased in all groups with quadriceps contraction at 0 degree and 15 degrees of flexion. PTA was decreased in group I and increased in groups II and III with quadriceps contraction at the same flexion angles. This difference was statistically significant in group III at 0 degree and 15 degrees of flexion. Quadriceps contraction did not affect the patellar position significantly even in the instability group at 45 degrees of flexion. In all flexion angles the balanced VMO:VL activity ratio was observed only in group I. In the other groups, VL activity was higher than VMO activity except at 45 degrees of flexion. These findings do not support the hypothesis of dominant centralizing effect of VMO on the patella in extension, but the effect of the VMO may be more clearly demonstrated by measuring PTA in both QC and QU positions.
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