Rectus Femoris and Vastus Medialis Muscles Exhibit Different Dynamics in Processing of Isometric Voluntary Contractions: A Fractal Analysis Study

Öztürk, Necla; Begovic, Haris; Demir, Pınar; Yağcıoğlu, Süha; Can, Filiz

doi:10.1109/memea.2019.8802161

Cited by 3 publications

(12 citation statements)

References 39 publications

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“…Based on these results, contraction starts were sorted from the fastest channel to the slowest one and represented in Table 1. 2,3,4 Number of the channel on the muscle vastus medialis; 5,6,7,8,9,10 Number of the channel on the muscle rectus femoris.…”

Section: Discussionmentioning

confidence: 99%

“…Rectus femoris is located in the middle, while vastus lateralis forms the bulk of the lateral thigh, vastus medialis is in the medial thigh, and vastus intermedius lies deep to the rectus femoris between vastus lateralis and medialis. Rectus femoris is a particular muscle (it is also a flexor muscle at the hip joint) while the other components are monoarticular muscles [3]. Therefore, it is expected that the different morphological and dynamic behavior of the quadriceps components would cause these muscles respond differently to artificially induces joint blockages by a reflective heel pad.…”

Section: Introductionmentioning

confidence: 99%

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Representation of Joint Patterns in HD SEMG: A Case Study

Milerská

Saifutdinova

Jelínek

et al. 2019

13th International Conference on Ubiquitous Computing and Ambient ‪Intelligence UCAmI 2019‬

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Investigation of joint patterns is one of many ways to detect soft tissue pathology. Functional blockage of the joint is a common clinical term that expresses one of the most common functional disorders in the musculoskeletal system. In this paper, we focus on HD SEMG signal processing with artificially induced joint blockage using reflective heel pad. Four bipolar electrodes were placed on the muscle vastus medialis and six on the muscle rectus femoris. One proband (male, 46 years) sat on the chair with the knee joint fixed at 70 ∘ flexion and hip at 120 ∘ between the pelvis and the femur, which corresponds to a relaxed sitting position. HD SEMG signals were recorded during three isometric maximum voluntary contractions of the knee extensors. The first data set of three contractions was measured without heel pad and the second and third data set with using pronation and supination heel pad respectively. Results show that stabilization of the knee is eliminated by fixing the leg in the chair and the muscle vastus medialis has only extension function without using heel pad. Thus, the contraction begins with activation of the muscle rectus femoris, which only has an extension function and then the muscle vastus medialis is added to the contraction. If we use the heel pad, the muscle vastus medialis stabilizes the knee and the contraction begins simultaneously with the musle rectus femoris.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Representation of Joint Patterns in HD SEMG: A Case Study

Milerská

Saifutdinova

Jelínek

et al. 2019

13th International Conference on Ubiquitous Computing and Ambient ‪Intelligence UCAmI 2019‬

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“…The results of the study showed that, in the control group, a resting period of 20-30 min did not significantly alter the EMD components and FD values. The results obtained from the stretching and control groups have already been published [31,34,35]. However, the results on the effects of TFM on the RF and VM have not been previously published.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental setup and recording technique used in the present study were previously presented in detail [34,35]. All recordings were performed on the subject's dominant leg.…”

Section: Methodsmentioning

confidence: 99%

“…Initially, the skin was shaved and cleaned with ethyl alcohol to decrease the skin impedance to below 2 KΩ. A pair of surface electrodes (Ag/AgCl) with a distance of 2 cm between the centers was placed over the RF, at a distance of 50% between the anterior spina iliaca superior and the superior pole of the patella [34,35]. For the VM muscle, electrodes were placed at 80% of the line between the anterior spina iliaca superior and the joint space in front of the anterior border of the medial ligament [34,35].…”

Section: Methodsmentioning

confidence: 99%

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Effects of Transverse Friction Massage on the Electromechanical Delay Components and Fractal Dimension of Surface Electromyography in Quadriceps Muscles

et al. 2023

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The purpose of this study was to assess the effects of transverse friction massage (TFM) on the electromechanical delay components and complexity of the surface electromechanical activity in the rectus femoris (RF) and vastus medialis (VM) muscles and to identify possible mechanisms behind TFM-induced alterations in the dynamics of RF and VM activity. Seven female and five male healthy subjects participated in this study. The subjects generated five maximal voluntary isometric contractions (MVICs) consecutively before and after TFM. Meanwhile, electromyography (EMG), mechanomyography (MMG), and force were recorded. The onset times of the recorded signals were detected offline by setting the threshold to three times the SD of the baseline. The delays between EMG and MMG (Δt(EMG–MMG)), MMG and force (Δt(MMG–Force)), and EMG and force (Δt(EMG–Force)) were computed from the detected onsets. The fractal dimension (FD) of the EMG time series was computed using the correlation dimension method. TFM increased Δt(MMG–Force) and Δt(EMG–Force) significantly in the RF but decreased Δt(EMG–MMG) and increased Δt(MMG–Force) in the VM. TFM decreased the FD in the RF and increased it in the VM. The results imply that TFM decreased the stiffness of both the RF and VM and decreased the duration of the electrochemical processes in the VM. It is proposed that the decrease in EMG complexity in the RF may be associated with the decreased stiffness of the RF, and the increase in EMG complexity in the VM may be associated with the decreased electrochemical processes in this muscle. It is also suggested that the opposite changes in EMG complexity in the RF and VM can be used as a discriminating parameter to search for the effects of an intervention in the quadriceps muscles. The present study also demonstrates how to discriminate the nonlinear dynamics of a complex muscle system from a noisy time series.

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