Peripheral Electrical Stimulation Paired With Movement-Related Cortical Potentials Improves Isometric Muscle Strength and Voluntary Activation Following Stroke

Objective: The weakness of the quadriceps strength in patellofemoral pain syndrome (PFPS) is very evident. Therefore, quadriceps strengthening exercises are very important part of the rehabilitation program. Neuromuscular Electrical Stimulation (NMES) is considered one of the methods for increasing quadriceps muscle strength. To evaluate the effectiveness of combined NMES and strengthening exercises to improve the recovery of quadriceps strength and function in patients with PFPS. Methods: This study was planned as a randomized controlled pilot study. A total of 27 patients (mean age=38.9±10.8 years, range=20-60 years; 16 females) with PFPS were assessed and randomly assigned into 2 groups. Group I received a standard program (quadriceps strengthening, hip strengthening and hamstring stretching) and NMES combined with quadriceps strengthening exercises simultaneously. Group II received the same standard program without NMES. Both groups were enrolled 3 times per week for 40 minutes per day in 6 weeks. Patients were assessed at the baseline, 3 rd, 6th, and 12th weeks of treatment. Quadriceps strength was evaluated by isokinetic dynamometer. The range of motion at testing was set between 0 for extension to 90 for flexion. The test was performed at 60 degrees/sn and concentric maximum peak torque value was recorded. Kujala and Lysholm scores were used for functional assessments. The data were analyzed using the SPSS 20.0. Shapiro-Wilk test was used to assess the distribution of data. The changes in dependent variables before treatment, 3 rd, 6th, and 12th weeks were analyzed using a 2 by 4 mixed-model analysis of variance (ANOVA). Pairwise comparisons with paired t test were used to determine whether the Group I or Group II, has changed over time. An intention- to- treat analysis was performed to impute values for missing data. An alpha level of 0.05 was established. Results: The study was completed with 20 patients. Group I (n=10; mean age=39.4±8.5 years; 7 females) and group II (n=10; mean age=43.2±11.7 years; 5 females) had no differences in pre-operative measures (p>.05). There was significant improvements in within groups statistics of all parameters for both groups (p<.05). No differences in quadriceps strength, Kujala and Lysholm scores between groups were found at the different time points (F= 0.86; p = 0.12, F=0,001; p =0.97, F=0.12; p=0.73, respectively) Conclusion: NMES combined with quadriceps strengthening exercises has no additional effect on PFPS patients’ on muscle strength and function. When considering these results, we believe that there is no need to continue the study in progress. [Table: see text]

Download Full-text

Electrical stimulation superimposed onto voluntary muscular contraction reduces deterioration of both postural control and quadriceps femoris muscle strength

Neuroscience ◽

10.1016/j.neuroscience.2009.11.052 ◽

2010 ◽

Vol 165 (4) ◽

pp. 1471-1475 ◽

Cited By ~ 18

Author(s):

T. Paillard ◽

E. Margnes ◽

J. Maitre ◽

V. Chaubet ◽

Y. François ◽

...

Keyword(s):

Electrical Stimulation ◽

Muscle Strength ◽

Postural Control ◽

Muscular Contraction ◽

Quadriceps Femoris ◽

Quadriceps Femoris Muscle ◽

Quadriceps Femoris Muscle Strength ◽

Femoris Muscle

Download Full-text

Effects of Mirror Therapy Combined With EMG-triggered Functional Electrical Stimulation to Improve on Upper Extremity Function in Patient with Chronic Stroke

Physikalische Medizin Rehabilitationsmedizin Kurortmedizin ◽

10.1055/a-1210-2930 ◽

2020 ◽

Author(s):

Joo Yeol Jung ◽

Pong Sub Youn ◽

Dong Hoon Kim

Keyword(s):

Electrical Stimulation ◽

Physical Therapy ◽

Muscle Strength ◽

Range Of Motion ◽

Upper Extremity ◽

Functional Electrical Stimulation ◽

Chronic Stroke ◽

Mirror Therapy ◽

Extremity Function ◽

Upper Extremity Function

AbstractThis study was performed to evaluate the effects of Mirror therapy combined with EMG-triggered Functional Electrical Stimulation on upper extremity function in patient with Chronic Stroke. A total of 24 chronic stroke patients were divided into 3 groups. Group I (n=8) was given with traditional physical therapy (TPT), group II (n=7) was given with traditional physical therapy and mirror therapy (MT), and group III (n=9) was given with traditional physical therapy and mirror therapy in conjunction with EMG-triggered Functional Electrical Stimulation (EMGFES-MT). Each group performed one hour a day 5 times a week for 6 weeks.We obtained the following result between before and after treatments about changes of elbow flexion muscle strength (EFMS), elbow extension muscle strength (EEMS), wrist flexion muscle strength (WFMS), wrist extension muscle strength (WEMS), elbow flexion range of motion (EFROM), elbow extension range of motion (EEROM), wrist flexion range of motion (WFROM), wrist extension range of motion (WEROM), grip strength (GS) and upper extremity function.Each group showed a significant difference in EFMS, EEMS, WFMS, WEMS, EFROM, EEROM, WFROM, WEROM, GS and upper extremity function (p<0.05) EMFES-MT group revealed significant differences in EEMS, WEROM, grip strength and upper extremity function as compared to the other groups (p<0.05). No difference was found in the change of spasticity among the 3 groups.Our results showed that EMFES-MT was more effective on elbow, WFMS, WEMS, AROM, grip strength and upper extremity function in patients with chronic stroke. We suggest that this study will be able to be used as an intervention data for recovering upper extremity function in chronic stroke patients

Download Full-text

Wearable Peripheral Electrical Stimulation Devices for the Reduction of Essential Tremor: A Review

IEEE Access ◽

10.1109/access.2021.3084819 ◽

2021 ◽

pp. 1-1

Author(s):

Alexandra Karamesinis ◽

Roy V. Sillitoe ◽

Abbas Z. Kouzani

Keyword(s):

Electrical Stimulation ◽

Essential Tremor ◽

Peripheral Electrical Stimulation

Download Full-text

Unilateral isometric muscle fatigue decreases force production and activation of contralateral knee extensors but not elbow flexors

Applied Physiology Nutrition and Metabolism ◽

10.1139/apnm-2014-0109 ◽

2014 ◽

Vol 39 (12) ◽

pp. 1338-1344 ◽

Cited By ~ 30

Author(s):

Israel Halperin ◽

David Copithorne ◽

David G. Behm

Keyword(s):

Muscle Fatigue ◽

Force Production ◽

Voluntary Activation ◽

Knee Extensors ◽

Elbow Flexors ◽

Post Intervention ◽

Nonlocal Effects ◽

And Performance ◽

Voluntary Contractions ◽

Isometric Muscle

Nonlocal muscle fatigue occurs when fatiguing 1 muscle alters performance of another rested muscle. The purpose of the study was to investigate if fatiguing 2 separate muscles would affect the same rested muscle, and if fatiguing the same muscle would affect 2 separate muscles. Twenty-one trained males participated in 2 studies (n = 11; n = 10). Subjects performed 2 pre-test maximum voluntary contractions (MVCs) with the nondominant knee extensors. Thereafter they performed two 100-s MVCs with their dominant knee extensors, elbow flexors, or rested. Between and after the sets, a single MVC with the nondominant rested knee extensors was performed. Subsequently, 12 nondominant knee extensors repeated MVCs were completed. Force, quadriceps voluntary activation (VA), and electromyography (EMG) were measured. The same protocol was employed in study 2 except the nondominant elbow-flexors were tested. Study 1: Compared with control conditions, a significant decrease in nondominant knee extensors force, EMG, and VA was found under both fatiguing conditions (P ≤ 0.05; effect size (ES) = 0.91–1.15; 2%–8%). Additionally, decrements in all variables were found from the first post-intervention MVC to the last (P ≤ 0.05; ES = 0.82–2.40; 9%–20%). Study 2: No differences were found between conditions for all variables (P ≥ 0.33; ES ≤ 0.2; ≤3.0%). However, all variables decreased from the first post-intervention MVC to the last (P ≤ 0.05; ES = 0.4–3.0; 7.2%–19.7%). Whereas the rested knee extensors demonstrated nonlocal effects regardless of the muscle being fatigued, the elbow-flexors remained unaffected. This suggests that nonlocal effects are muscle specific, which may hold functional implications for training and performance.

Download Full-text