Effects of magnetic stimulation compared to electrical stimulation on muscle contraction in quadriceps femoris muscle of healthy subjects: A pilot study

2021 ◽  
Vol 2 (5) ◽  
Author(s):  
Ryosuke Nakanishi ◽  
◽  
Minoru Tanaka ◽  
Noriaki Maeshige ◽  
Hidemi Fujino ◽  
...  
Keyword(s):  
Electrical Stimulation ◽  
Muscle Contraction ◽  
Healthy Subjects ◽  
Magnetic Stimulation ◽  
Muscle Thickness ◽  
Rectus Femoris ◽  
Superficial Layer ◽  
Quadriceps Femoris ◽  
Quadriceps Femoris Muscle ◽  
Femoris Muscle

Background/Aims: This study investigated whether pulsed magnetic stimulation contracts superficial and/or deep muscles compared with those induced by electrical stimulations, i.e., low- and kilohertzfrequency currents. Methods: Eight healthy subjects were recruited and measured the quadriceps femoris muscle thickness using ultrasound imaging, and Visual Analog Scale (VAS) for stimulation-induced pain during the same stimulation intensity. Results: Pulsed magnetic stimulation increased the thickness of rectus femoris muscle similar to other electrical stimulations, but not the vastus intermedius muscle. Meanwhile, the pain score of VAS caused by pulsed magnetic stimulation was lower than that by those electrical stimulations. Conclusions: These results suggest that pulsed magnetic stimulation is effective for the contraction of superficial layer muscles without stimulation-induced pain but not for contraction of deep layer muscles. Keywords: pulsed magnetic stimulation; electrical stimulation; stimulation-induced pain; muscle contraction.

Mechanical behavior of the quadriceps femoris muscle tendon unit during low-load contractions

2008 ◽  
Vol 104 (5) ◽  
pp. 1320-1328 ◽  
Author(s):  
Taija Finni ◽  
Marko Havu ◽  
Shantanu Sinha ◽  
Jussi-Pekka Usenius ◽  
Sulin Cheng
Keyword(s):  
Vastus Lateralis ◽  
Single Point ◽  
Frontal Plane ◽  
Muscle Thickness ◽  
Rectus Femoris ◽  
Quadriceps Femoris ◽  
Thigh Muscle ◽  
Cross Sectional ◽  
Quadriceps Femoris Muscle ◽  
Femoris Muscle

We examined the relationships between morphology and muscle-tendon dynamics of the quadriceps femoris muscle of 11 men using velocity-encoded phase-contrast magnetic resonance imaging (MRI). Thigh muscle electromyography and joint range of motion were first measured outside the MRI scanner during knee extension-flexion tasks that were performed at a rate of 40 times/min with elastic bands providing peak resistance of 5.2 kp (SD 0.4) to the extension. The same movement was repeated inside the MRI scanner bore where tissue velocities and muscle morphology were recorded. The average displacement in the proximal and distal halves of the rectus femoris and vastus intermedius aponeuroses was different ( P = 0.049), reflecting shortening (1.6%), but the tensile strain along the length of the aponeuroses was uniform. The aponeurosis behavior varied among individuals, and these individual patterns were best explained by the differences in relative cross-sectional area of rectus femoris to vastus muscles ( r = 0.71, P = 0.014). During dynamic contraction, considerable deformation of muscles in the axial plane caused an anatomic measure such as muscle thickness to change differently (decrease or increase) in different sites of measurement. For example, when analyzed from the axial images, the vastus lateralis thickness did not change ( P = 0.946) in the frontal plane through femur but increased in a 45° oblique plane between the frontal and sagittal planes ( P = 0.004). The present observations of the heterogeneity and individual behavior emphasize the fact that single-point measurements do not always reflect the overall behavior of muscle-tendon unit.

scholarly journals Quadriceps Femoris Muscle Torques and Fatigue Generated by Neuromuscular Electrical Stimulation With Three Different Waveforms

2001 ◽  
Vol 81 (7) ◽  
pp. 1307-1316 ◽  
Author(s):  
Yocheved Laufer ◽  
Julie Deanne Ries ◽  
Peter M Leininger ◽  
Gad Alon
Keyword(s):  
Electrical Stimulation ◽  
Mixed Model ◽  
Neuromuscular Electrical Stimulation ◽  
Quadriceps Femoris ◽  
Muscle Performance ◽  
Current Phase ◽  
Quadriceps Femoris Muscle ◽  
Male Subjects ◽  
Femoris Muscle ◽  
Female Subjects

Abstract Background and Purpose. Neuromuscular electrical stimulation is used by physical therapists to improve muscle performance. Optimal forms of stimulation settings are yet to be determined, as are possible sex-related differences in responsiveness to electrical stimulation. The objectives of the study were: (1) to compare the ability of 3 different waveforms to generate isometric contractions of the quadriceps femoris muscles of individuals without known impairments, (2) to compare muscle fatigue caused by repeated contractions induced by these same waveforms, and (3) to examine the effect of sex on muscle force production and fatigue induced by electrical stimulation. Subjects. Fifteen women and 15 men (mean age=29.5 years, SD=5.4, range=22–38) participated in the study. Methods. A portable battery-operated stimulator was used to generate either a monophasic or biphasic rectangular waveform. A stimulator that was plugged into an electrical outlet was used to generate a 2,500-Hz alternating current. Phase duration, frequency, and on-off ratios were kept identical for both stimulators. Participants did not know the type of waveform being used. Torque was measured using a computerized dynamometer: a maximal voluntary isometric contraction (MVIC) of the right quadriceps femoris muscle set at 60 degrees of knee flexion was determined during the first session. In each of the 3 testing sessions, torque of contraction and fatigue elicited by one waveform were measured. Order of testing was randomized. Torque elicited by electrical stimulation was expressed as a percentage of average MVIC. A mixed-model analysis of variance was used to determine the effect of stimulation and sex on strength of contraction and fatigue. Bonferroni-corrected post hoc tests were used to further distinguish between the effects of the 3 stimulus waveforms. Results. The results indicated that the monophasic and biphasic waveforms generated contractions with greater torque than the polyphasic waveform. These 2 waveforms also were less fatiguing. The torques from the maximally tolerated electrically elicited contractions were greater for the male subjects than for the female subjects. Discussion and Conclusion. Muscle torque and fatigue of electrically induced contractions depend on the waveform used to stimulate the contraction, with monophasic and biphasic waveforms having an advantage over the polyphasic waveform. All tested waveforms elicited, on average, stronger contractions in male subjects than in female subjects when measured as a percentage of MVIC.

scholarly journals Preoperative muscle thickness influences muscle activation after arthroscopic knee surgery

2021 ◽  
Author(s):  
Jorge Amestoy ◽  
Daniel Pérez-Prieto ◽  
Raúl Torres-Claramunt ◽  
Juan Francisco Sánchez-Soler ◽  
Albert Solano ◽  
...  
Keyword(s):  
Knee Pain ◽  
Anterior Knee Pain ◽  
Muscle Thickness ◽  
Patellofemoral Pain ◽  
Quadriceps Femoris ◽  
Arthroscopic Partial Meniscectomy ◽  
Neuromuscular Activation ◽  
Quadriceps Femoris Muscle ◽  
Anterior Knee ◽  
Femoris Muscle

Abstract Purpose The aim of this study was to compare the correlation between preoperative quadriceps femoris muscle thickness and postoperative neuromuscular activation and quadriceps femoris strength in patients with and without patellofemoral pain after arthroscopic partial meniscectomy. Methods A series of 120 patients were prospectively analysed in a longitudinal cohort study of patients scheduled for arthroscopic partial meniscectomy. The patellofemoral pain group included patients who developed anterior knee pain after surgery while the control group included those who had not done so. Patients with preoperative patellofemoral pain, previous knee surgeries as well as those on whom additional surgical procedures had been performed were excluded. Of the 120 initially included in the study, 90 patients were analysed after the exclusions. Results There is a direct correlation between preoperative quadriceps femoris muscle thickness and the neuromuscular activity values and the strength of the muscle at 6 weeks after surgery. These results were seen exclusively in the group of patients who do not develop patellofemoral pain (0.543, p = 0.008). The group of patients who developed anterior knee pain in the postoperative period did not show this correlation (n.s.). Conclusion In patients without patellofemoral pain after meniscectomy, the greater the preoperative thickness of the quadriceps femoris, the more postoperative neuromuscular activation and strength they had. This correlation did not occur in those patients who develop patellofemoral pain after meniscal surgery. Level of evidence II.

scholarly journals Comparison of Hamstrings and Quadriceps Femoris Muscle Thickness Increment between Agonist-Antagonist Paired Set and Traditional Set Resistance Training in Untrained Healthy Subjects

2021 ◽  
Vol 3 (2) ◽  
pp. 60
Author(s):  
Gutama Arya Pringga ◽  
R. A. Meisy Andriana ◽  
Indrayuni Lukitra Wardhani ◽  
Lydia Arfianti
Keyword(s):  
Resistance Training ◽  
Muscle Mass ◽  
Muscle Thickness ◽  
Quadriceps Femoris ◽  
Quadriceps Femoris Muscle ◽  
Leg Extension ◽  
Increase Muscle Mass ◽  
Group 3 ◽  
Femoris Muscle ◽  
Group 1

Background: Resistance training is an effective way to increase muscle mass. Resistance training with agonist-antagonist paired set method can be an alternative to increase muscle mass within a relatively short training time.Aim: To compare the increase in hamstrings and quadriceps femoris muscle thickness between agonist-antagonist paired set (APS) and traditional set (TS) resistance training in untrained healthy subjects.Material and Methods: This study was an experimental study on 16 untrained healthy men which were randomly assigned to the APS and the TS group. Each group got leg curl and leg extension exercises with equal training volume for 6 weeks. For the APS group, 1 set of leg curls was followed by 1 set of leg extensions, repeated for 3 sets. For the TS group, 3 sets of leg curls were followed by 3 sets of leg extensions. Muscle thickness was compared from pre- to post-training and between the intervention groups using B-mode ultrasound.Results: Muscle thickness of the hamstrings and quadriceps femoris increased significantly from pre- to post-training in both groups (p<0.05). The increase in muscle thickness between the two groups was not significantly different (p> 0.05).Conclusion: Resistance training with the APS method did not give a higher increment of hamstrings and quadriceps femoris muscle thickness compared to the TS method in healthy untrained subjects.

Ultrasound Assessment of Quadriceps Femoris Muscle Thickness in Critically Ill Children

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Robert M. Hoffmann ◽  
Katelyn A. Ariagno ◽  
Ivy V. Pham ◽  
Carol E. Barnewolt ◽  
Delma Y. Jarrett ◽  
...  
Keyword(s):  
Critically Ill ◽  
Muscle Thickness ◽  
Quadriceps Femoris ◽  
Critically Ill Children ◽  
Quadriceps Femoris Muscle ◽  
Ultrasound Assessment ◽  
Femoris Muscle
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