Spinal Accessory Nerve Neuropathies Followng Neck Dissection

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P45-P45
Author(s):  
Carlos Neutzling Lehn ◽  
Luciana Pereira Lima ◽  
Ali Amar
Keyword(s):  
Neck Dissection ◽  
Cranial Nerve ◽  
Preoperative Evaluation ◽  
Trapezius Muscle ◽  
Electric Activity ◽  
Surface Emg ◽  
Voluntary Contraction ◽  
Mean Values ◽  
Shoulder Dysfunction ◽  
Neck Tumors

Objective To evaluate through electromyography (EMG) the injury to the 11th cranial nerve following neck dissection. Methods Prospective study with 60 patients submitted to neck dissection as part of treatment of head and neck tumors. All the cases underwent physiotherapic evaluation of shoulder dysfunction. Nerve integrity was evaluated pre- and postoperatively through surface EMG registering the electric activity of descendent fibers of trapezius muscle during maximal isometric voluntary contraction. The patients were grouped according the type of neck dissection, presence of shoulder pain, impairment during abduction movement, and hypotrophy or atrophy of trapezius muscle. Results The action potential had mean and standard deviation of 61,7±31,6mcV in preoperative evaluation and 15,6±12,4mcV in postoperative evaluation (p<0.001). According to the neck dissection extension, there were mean values of 18,8±14,2mcV after dissection includiog level IIb and 18,8±14,2 mcV after dissection including levels IIb and V (p<0.002). Conclusions Surface EMG is a sensitive and painless for 11th cranial nerve disfunction evaluation. In all cases, the superior fibers of trapezius muscle were affected with presence of pain and impairment abduction movement of the arm. The results suggest the benefit of trapezius muscle EMG to confirm the diagnosis and early physiotherapic intervention in neuropathies of the 11th cranial nerve.

Wrist and Shoulder Muscle Activity Changes Across Computer Tasks

2002 ◽  
Vol 46 (13) ◽  
pp. 1129-1132 ◽  
Author(s):  
Jack Dennerlein ◽  
Maria-Helena DiMarino ◽  
Ted Becker ◽  
Peter Johnson
Keyword(s):  
Muscle Activity ◽  
Maximum Voluntary Contraction ◽  
Trapezius Muscle ◽  
Surface Emg ◽  
Voluntary Contraction ◽  
Office Work ◽  
Shoulder Muscle ◽  
Physical Risk Factors ◽  
Computer Workstation ◽  
Muscle Groups

The computer workstation is a ubiquitous tool in the office work environment; however, its use varies across many different tasks from surfing the Internet to typing. The question, therefore, is how does exposure to different physical risk factors for musculoskeletal disorders vary across tasks? Fifteen adults (10 females, 5 males) completed tasks simulating work at a computer workstation. The tasks were typing text, completing an html-based form, editing a document, a graphics task, and finally navigating through a series of web pages. During these tasks the muscle activity of the wrist prime movers and three shoulder muscle groups were recorded using surface EMG. For the wrist, the extensors were the most active ranging on average from 8 to 25 percent of Maximum Voluntary Contraction amplitude, with the greatest activity occurring in the typing task. The wrist activity decreased when the work changed from a keyboard-based activity to predominantly mouse-based activity. For the shoulder, the greatest activity was in the Trapezius muscle. The shoulder muscles were most active when both the mouse and the keyboard were required by the task. in summary, wrist and shoulder muscle activities at a computer workstation depend upon the type of task at hand.

Intramuscular and surface electromyogram changes during muscle fatigue

1986 ◽  
Vol 60 (4) ◽  
pp. 1179-1185 ◽  
Author(s):  
T. Moritani ◽  
M. Muro ◽  
A. Nagata
Keyword(s):  
Muscle Fatigue ◽  
Biceps Brachii ◽  
Surface Emg ◽  
Firing Frequency ◽  
Voluntary Contraction ◽  
Mean Power ◽  
Mean Power Frequency ◽  
Surface Electromyogram ◽  
Spike Amplitude ◽  
Frequency Power

Twelve male subjects were tested to determine the effects of motor unit (MU) recruitment and firing frequency on the surface electromyogram (EMG) frequency power spectra during sustained maximal voluntary contraction (MVC) and 50% MVC of the biceps brachii muscle. Both the intramuscular MU spikes and surface EMG were recorded simultaneously and analyzed by means of a computer-aided intramuscular spike amplitude-frequency histogram and frequency power spectral analysis, respectively. Results indicated that both mean power frequency (MPF) and amplitude (rmsEMG) of the surface EMG fell significantly (P less than 0.001) together with a progressive reduction in MU spike amplitude and firing frequency during sustained MVC. During 50% MVC there was a significant decline in MPF (P less than 0.001), but this decline was accompanied by a significant increase in rmsEMG (P less than 0.001) and a progressive MU recruitment as evidenced by an increased number of MUs with relatively large spike amplitude. Our data suggest that the surface EMG amplitude could better represent the underlying MU activity during muscle fatigue and the frequency powers spectral shift may or may not reflect changes in MU recruitment and rate-coding patterns.

Initial phase of maximal voluntary and electrically stimulated knee extension torque development at different knee angles

2004 ◽  
Vol 97 (5) ◽  
pp. 1693-1701 ◽  
Author(s):  
C. J. de Ruiter ◽  
R. D. Kooistra ◽  
M. I. Paalman ◽  
A. de Haan
Keyword(s):  
Muscle Activation ◽  
Knee Extensor ◽  
Surface Emg ◽  
Knee Extension ◽  
Voluntary Contraction ◽  
Voluntary Activation ◽  
Knee Angle ◽  
Time Integral ◽  
Voluntary Contractions ◽  
Torque Development

We investigated the capacity for torque development and muscle activation at the onset of fast voluntary isometric knee extensions at 30, 60, and 90° knee angle. Experiments were performed in subjects ( n = 7) who had high levels (>90%) of activation at the plateau of maximal voluntary contractions. During maximal electrical nerve stimulation (8 pulses at 300 Hz), the maximal rate of torque development (MRTD) and torque time integral over the first 40 ms (TTI40) changed in proportion with torque at the different knee angles (highest values at 60°). At each knee angle, voluntary MRTD and stimulated MRTD were similar ( P < 0.05), but time to voluntary MRTD was significantly longer. Voluntary TTI40 was independent ( P > 0.05) of knee angle and on average (all subjects and angles) only 40% of stimulated TTI40. However, among subjects, the averaged (across knee angles) values ranged from 10.3 ± 3.1 to 83.3 ± 3.2% and were positively related ( r2 = 0.75, P < 0.05) to the knee-extensor surface EMG at the start of torque development. It was concluded that, although all subjects had high levels of voluntary activation at the plateau of maximal voluntary contraction, among subjects and independent of knee angle, the capacity for fast muscle activation varied substantially. Moreover, in all subjects, torque developed considerably faster during maximal electrical stimulation than during maximal voluntary effort. At different knee angles, stimulated MRTD and TTI40 changed in proportion with stimulated torque, but voluntary MRTD and TTI40 changed less than maximal voluntary torque.

scholarly journals Recovery of trapezius muscle paralysis in neck dissection in which the spinal accessory nerve was preserved

Toukeibu Gan ◽  
2008 ◽  
Vol 34 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Tetsuro Onitsuka ◽  
Mitsuru Ebihara ◽  
Yoshiyuki Iida ◽  
Tomoyuki Kamijyo ◽  
Rie Asano ◽  
...  
Keyword(s):  
Neck Dissection ◽  
Trapezius Muscle ◽  
Spinal Accessory Nerve ◽  
Accessory Nerve ◽  
Muscle Paralysis ◽  
Spinal Accessory

Changes of muscular sound during sustained isometric contraction up to exhaustion

1989 ◽  
Vol 66 (4) ◽  
pp. 1593-1598 ◽  
Author(s):  
C. Orizio ◽  
R. Perini ◽  
A. Veicsteinas
Keyword(s):  
Isometric Contraction ◽  
Exercise Intensity ◽  
Maximum Voluntary Contraction ◽  
Isometric Exercise ◽  
Surface Emg ◽  
Voluntary Contraction ◽  
Biceps Muscle ◽  
Output Force ◽  
Contact Transducer ◽  
Four Levels

The sound (SMG) generated by the biceps muscle during isometric exercise at 20, 40, 60, and 80% of maximum voluntary contraction (MVC) up to exhaustion has been recorded by a contact transducer and integrated (iSMG), together with the surface electromyogram (EMG) in eight young untrained men. At the onset of exercise, iSMG and integrated surface EMG (iEMG) amplitude increased linearly with exercise. iSMG remained constant for 253 +/- 73 (SD), 45 +/- 16, 21 +/- 5, and 0 s at the four levels of contraction. Then iSMG increased linearly at 20% MVC, fluctuated at 40% MVC, and decreased exponentially at 60 and 80% MVC. iSMG exhaustion-to-onset ratio was 5.0 at 20%, 1.0 at 40%, and 0.2 at 60 and 80% MVC. On the contrary, independently of exercise intensity, iEMG increased with time, being 1.4 higher at exhaustion than at the onset. The nonunivocal iSMG changes with time and effort of exercise suggest that the sound may be a useful tool to acquire different information to EMG and output force during muscle contraction up to fatigue.

scholarly journals Do patients benefit from physiotherapy for shoulder dysfunction following neck dissection? A systematic review

2020 ◽  
Vol 134 (2) ◽  
pp. 104-108
Author(s):  
A S Harris
Keyword(s):  
Systematic Review ◽  
Neck Dissection ◽  
Current Evidence ◽  
Shoulder Dysfunction ◽  
Cost Efficacy ◽  
Prospective Trials ◽  
Randomised Controlled ◽  
Upper Limb Dysfunction ◽  
Term Benefit

AbstractObjectiveAccessory nerve palsy affects a proportion of patients following neck dissection, and results in shoulder dysfunction and regional pain. This project aimed to establish the evidence supporting post-operative physiotherapy for the shoulder following neck dissection.MethodA systematic review was conducted of prospective trials investigating the efficacy of rehabilitation for shoulder or upper limb dysfunction and pain following any type of neck dissection.ResultsA total of 820 papers were identified; through a staged review process, 7 trials were found that fulfilled the inclusion criteria. These included three randomised, controlled trials and four non-randomised studies. Five out of the seven trials demonstrated a statistically significant benefit of physiotherapy.ConclusionCurrent evidence shows a benefit from physiotherapy in patients with shoulder dysfunction following neck dissection. Some evidence suggests progressive resistance is superior to other types of physiotherapy. Long-term benefit and cost efficacy have not been studied.

Electrophysiologic analysis of injury to cranial nerve XI during neck dissection

Head & Neck ◽  
2015 ◽  
Vol 38 (S1) ◽  
pp. E372-E376 ◽  
Author(s):  
Bostjan Lanisnik ◽  
Miha Zargi ◽  
Zoran Rodi
Keyword(s):  
Neck Dissection ◽  
Cranial Nerve
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