scholarly journals Factors Affecting Prolonged Neck and Shoulder Pain (Katakori) in Female Adolescents: Focus on Maximal Voluntary Contraction and Endurance of Neck Flexor and Extensor Muscles and Neck Disability Index (NDI)

2020 ◽  
Vol 35 (4) ◽  
pp. 483-487
Author(s):  
Masaru KANDA ◽  
Takuya KITAMURA ◽  
Naritoshi SATO ◽  
Isamu KONISHI ◽  
Yusuke SUZUKI ◽  
...  
Keyword(s):  
Shoulder Pain ◽  
Maximal Voluntary Contraction ◽  
Neck Disability Index ◽  
Voluntary Contraction ◽  
Female Adolescents ◽  
Factors Affecting ◽  
Extensor Muscles ◽  
Neck And Shoulder Pain ◽  
Neck Disability

Factors Affecting Force Loss With Prolonged Stretching

2001 ◽  
Vol 26 (3) ◽  
pp. 262-272 ◽  
Author(s):  
David G. Behm ◽  
Duane C. Button ◽  
Jeremy C. Butt
Keyword(s):  
Maximal Voluntary Contraction ◽  
Muscle Activation ◽  
Maximum Voluntary Contraction ◽  
Voluntary Contraction ◽  
Control Group ◽  
Tetanic Force ◽  
Factors Affecting ◽  
Passive Stretching ◽  
Interpolated Twitch Technique ◽  
Muscle Compliance

The purpose of this study was to investigate factors underlying the force loss occurring after prolonged, static, passive stretching. Subjects were tested before and 5-10 min following 20 min of static, passive stretching of the quadriceps (N = 12) or a similar period of no stretch (control, N = 6). Measurements included isometric maximal voluntary contraction (MVC) force, surface integrated electromyographic (iEMG) activity of the quadriceps and hamstrings, evoked contractile properties (twitch and tetanic force), and quadriceps inactivation as measured by the interpolated twitch technique (ITT). Following stretching, there was a significant 12% decrement in MVC with no significant changes in the control group. Muscle inactivation as measured by the ITT and iEMG increased by 2.8% and 20.2%, respectively. While twitch forces significantly decreased 11.7%, there was no change in tetanic force post-stretch. Although possible increases in muscle compliance affected twitch force, a lack of tetanic force change would suggest that post-stretch force decrements are more affected by muscle inactivation than changes in muscle elasticity. Key Words: antagonist, electromyography, maximum voluntary contraction, muscle activation, twitch, tetanus

Differential Strength and Endurance Parameters of the Craniocervical and Cervicothoracic Extensors and Flexors in Healthy Individuals

2017 ◽  
Vol 33 (2) ◽  
pp. 166-170 ◽  
Author(s):  
Shaun O’Leary ◽  
Charlotte Loraas Fagermoen ◽  
Hiroyuki Hasegawa ◽  
Ann-Sofi Slettevold Thorsen ◽  
Luke Van Wyk
Keyword(s):  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Neck Muscles ◽  
Isometric Strength ◽  
Normal Variation ◽  
Healthy Individuals ◽  
Task Failure ◽  
Load Duration ◽  
Extensor Muscles

This study examined isometric strength (maximal voluntary contraction [MVC]) and endurance of cervical flexor and extensor muscles in healthy individuals at the craniocervical (CC) and cervicothoracic (CT) axes. MVC and endurance measures (time to task failure in seconds [s]) at 50% MVC were recorded in 4 directions (CC flexion, CC extension, CT flexion, and CT extension) in 20 males and 20 females, and 6 strength and endurance ratios were calculated. The findings showed that the cervical extensor muscles are not only much stronger than the flexors (1.3–2 times greater MVC), but also have greater capacity for endurance (2–2.4 times greater). While males produced significantly greater MVC recordings than females (P < .003), strength ratios (P > .06) and endurance measures (P > .11) were similar. Endurance ratios were also similar except the CT extension to CC flexion ratio, which was significantly larger in females compared with males (P = .03). These findings demonstrate that substantial but normal variation exists in strength and endurance parameters between cervical flexor and extensor muscles. This is informative to clinicians when evaluating the performance of these neck muscles or when deciding on exercise parameters (eg, load, duration) when training their performance.

scholarly journals Successful management of a professional viola player with a complex playing related musculoskeletal disorder

2021 ◽  
Vol 72 (1) ◽  
pp. 59-65
Author(s):  
Florina Georgeta Popescu ◽  
Monica Adriana Vaida ◽  
Grant JK Mackay ◽  
Claudia Borza ◽  
Elena-Ana Păuncu ◽  
...  
Keyword(s):  
Range Of Motion ◽  
Shoulder Pain ◽  
Manual Therapy ◽  
Conservative Management ◽  
Neck Disability Index ◽  
Treatment Techniques ◽  
Therapy Program ◽  
Shoulder Range Of Motion ◽  
Mulligan Concept ◽  
Neck Disability

Abstract Objective: This paper presents the case of a 53-year-old female professional violist with chronic disabling neck and shoulder pain who had failed standard conservative management. A multimodal approach including Mulligan Concept manual therapy techniques resulted in a successful return to the workplace. Methods: Mobilization with Movements and Sustained Natural Apophyseal Glides as part of Mulligan Concept manual therapy approach, were the main treatment techniques utilized. Neuro-dynamic exercises, strengthening exercises, ergonomic interventions, alterations in playing load, and posture training were also implemented. Pain, range of motion and disability levels were monitored throughout treatment. Results: Significant improvements were seen in both neck and shoulder range of motion alongside considerable pain reduction in both regions. Clinically meaningful improvements were also noted in Neck Disability Index and Shoulder Pain and Disability Index scores. Discussion: Ergonomic intervention with postural correction and replacement with a lighter viola also contributed to patient recovery and return to the workplace. The Mulligan approach has proved to be effective in a wide variety of conditions. Still, it has not previously been considered in managing complex neck and upper limb disfunctions in string players. Conclusion: This paper highlights how an intensive manual therapy program had better results compared with standard conservative management. Multimodal intervention with occupational, ergonomic, and physiotherapy approaches was effective, leading to progressive re-integration into the workplace. Mulligan Concept manual therapy techniques should be considered in the management of playing related musculoskeletal disorders.

scholarly journals Scapular Retraction Under Adduction Load: an Alternative to Overhead Exercises to Activate Infraspinatus, Upper and Lower Trapezius in Subjects With and Without Shoulder Pain

2021 ◽  
Author(s):  
Jefferson James dos Santos ◽  
Rebeca Orozco Nagy ◽  
Matheus Almeida Souza ◽  
Leonardo Intelangelo ◽  
Michelle Almeida Barbosa ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Shoulder Pain ◽  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Load Cell ◽  
Subacromial Space ◽  
Condition Effect ◽  
Lower Trapezius

Exercises for lower trapezius (LT) often use overhead positions, causing compressive forces to the subacromial space. Scapular retraction would be an alternative to activate LT muscle. Electromyography of infraspinatus (IS), upper (UT) and LT was recorded during scapular retraction under progressive adduction loads of 42 participants, divided in 2 groups: with (SP, n=26) and without shoulder pain (nSP, n=16). The adduction loads of 20, 30, 40 and 50% of the maximal voluntary contraction were applied using a load cell. Normalized electromyography and the ratio between UT and LT (UT:LT) were used for statistical analysis. No differences were observed between groups, but a condition effect occurred for all muscles: UT showed higher values at 50% vs. 20% (p=0.004); LT showed higher values on 40% and 50% (p=0.001; 0.006). Higher values for IS were noted at 40% (vs 20%; p=0.04), and at 50% (vs. 20%; p=0.001, vs. 30%, p=0.001; vs. 40%; p=0.001). UT:LT showed lower values at 50% (vs. 20%; p=0.001, and vs. 30%; p=0.016). Scapular retraction with adduction loads at 40-50% is an alternative to overhead exercises aiming to activate the LT and the IS muscles. The exercise ensures higher levels of LT and IS excitation, without increasing UT excitation.

scholarly journals Scapular Retraction under Adduction Load: An Alternative to Overhead Exercises to Activate Infraspinatus, Upper, and Lower Trapezius in Subjects with and without Shoulder Pain

2021 ◽  
Vol 18 (17) ◽  
pp. 9251
Author(s):  
Jefferson James dos Santos ◽  
Rebeca Orozco Nagy ◽  
Matheus Almeida Souza ◽  
Leonardo Intelangelo ◽  
Michelle Almeida Barbosa ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Shoulder Pain ◽  
Maximal Voluntary Contraction ◽  
Voluntary Contraction ◽  
Load Cell ◽  
Subacromial Space ◽  
Painful Shoulder ◽  
Upper Trapezius ◽  
Condition Effect ◽  
Lower Trapezius

Exercises for lower trapezius (LT) often use overhead positions, causing compressive forces to the subacromial space. Scapular retraction would be an alternative to activate LT muscle. The present study aimed to assess the excitation levels of infraspinatus, upper trapezius, and lower trapezius muscles during a scapular retraction exercise under progressive adduction loads in subjects with and without painful shoulder. Electromyography of infraspinatus (IS), upper trapezius (UT), and LT was recorded during scapular retraction under progressive adduction loads of 42 participants, divided into two groups: with (SP, n = 26) and without shoulder pain (nSP, n = 16). The adduction loads of 20%, 30%, 40%, and 50% of the maximal voluntary contraction (MVC) were applied using a load cell. Normalized electromyography and the ratio between UT and LT (UT:LT) were used for statistical analysis. No differences were observed between groups, but a condition effect occurred for all muscles: UT showed higher values at 50% vs. 20% of MVC (p = 0.004); LT showed higher values on 40% and 50% of MVC (p = 0.001; 0.006). Higher values for IS were noted at 40% of MVC (vs. 20% of MVC; p = 0.04) and at 50% of MVC (vs. 20% of MVC; p = 0.001, vs. 30% of MVC, p = 0.001; vs. 40% of MVC; p = 0.001). UT:LT showed lower values at 50% of MVC (vs. 20% of MVC; p = 0.001 and vs. 30% of MVC; p = 0.016). Scapular retraction with adduction loads at 40–50% is an alternative to overhead exercises aiming to activate the LT and the IS muscles. The exercise ensures higher levels of LT and IS excitation without increasing UT excitation.

scholarly journals Acupoint Embedding of Polyglactin 910 Sutures in Patients with Chronic Pain due to Cervical Spondylotic Radiculopathy: A Multicenter, Randomized, Controlled Clinical Trial

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yu-Xia Chu ◽  
Wen-Qiang Cui ◽  
Fei Xu ◽  
Yuan-Yuan Pan ◽  
Yan-Hua Ma ◽  
...  
Keyword(s):  
Shoulder Pain ◽  
Clinical Symptoms ◽  
Short Form ◽  
Neck Disability Index ◽  
Polyglactin 910 ◽  
Cervical Spondylotic Radiculopathy ◽  
Sf 36 ◽  
Neck And Shoulder Pain ◽  
Vas Scores ◽  
Baseline Values

Objective. We aimed to investigate the effectiveness of acupoint polyglactin 910 (PGLA) embedding in patients with cervical spondylotic radiculopathy (CSR). Methods. A total of 102 CSR patients with neck and shoulder pain were recruited and assigned randomly into three groups: the sham acupoint embedding (SAE) group, the middle-layer acupoint PGLA embedding (MAPE) group, and the deep-layer acupoint PGLA embedding (DAPE) group. The primary outcomes were Visual Analog Scale (VAS) scores showing the analgesic effects of treatment. Secondary outcomes included clinical symptoms (evaluated by the Yasuhisa Tanaka 20 (YT-20) score and the neck disability index (NDI)) and patient health status (evaluated by the 36-item short-form survey (SF-36)) as reported in the trial. Results. Compared with the SAE group, VAS scores were significantly reduced at 1, 2, 3, 4, and 10 weeks after the first treatment in both the DAPE and MAPE groups (P < 0.001). Moreover, there were statistically significant increases in the weekly YT-20 scores and significant reductions of the weekly NDI scores compared with baseline values in both the DAPE and MAPE groups (P < 0.001). Compared with baseline values, both the physical component summary (PCS) and the mental component summary scores of the SF-36 at 2, 3, 4, and 10 weeks were significantly higher in the DAPE and MAPE groups (P < 0.001). There were significant lower VAS scores (P < 0.01), higher PCS scores (P < 0.05) at 3 weeks, and lower NDI scores (P < 0.05) at 4 weeks in the DAPE group compared with the MAPE group. Conclusions. Both DAPE and MAPE showed significant and long-lasting effects on alleviating pain and improving clinical symptoms as well as quality of life in CSR patients with neck and shoulder pain. A more intense effect was seen in the DAPE group compared with the MAPE group.

scholarly journals Relationship between Functional State of Cervical Spine, Fear of Movement and Neck-Shoulder Muscle Pain Threshold in Office Workers in The Aspect of Gender

2019 ◽  
Vol 2 (19) ◽  
Author(s):  
Deimanta Maksimovaitė ◽  
Giedrė Jurgelaitienė
Keyword(s):  
Cervical Spine ◽  
Shoulder Pain ◽  
Functional State ◽  
Muscle Pain ◽  
Pain Threshold ◽  
Fear Of Movement ◽  
Shoulder Muscle ◽  
Infraspinatus Muscle ◽  
Neck And Shoulder Pain ◽  
Neck Disability

Background. Neck and shoulder pain is one of the most common problems of the musculoskeletal system (De Meulemeester et al., 2017). Work-related neck and shoulder pain is one of the most important and every year increasing problems in ofce workers (Cagnie et al., 2013). Purpose. To determine the relationship between functional state of cervical spine, fear of movement and neck-shoulder muscle pain threshold in ofce workers in the aspect of gender. Methods. Thirty six individuals voluntarily participated in the research (21 females, 15 males), who met inclusions criteria. We assessed subjective functional state of cervical spine, fear of movement and neck-shoulder muscle pain threshold on both sides. Results. Females had greater neck disability than males (females – 12.24 ± 3.75 scores, males – 11.27 ± 3.28 scores, p > 0.05) and felt more pain-induced fear of movement during work (females – 23.05 ± 3.72 scores, males – 21.8 ± 2.37 scores, p > 0.05). Males’ neck-shoulder muscle pain threshold on both sides was higher than that of females (p < 0.05). Conclusions. There was no difference between sedentary females and males’ neck disability and fear of movement. Sedentary males had signifcantly higher neck-shoulder muscle pain threshold compared to females. There were moderate correlations between male neck disability and right supraspinatus muscle pain threshold, but we did not fnd signifcant correlations between female results. There were moderate correlations between females’ fear of movement at work and left infraspinatus muscle pain threshold, while between males there were moderate correlations between fear of movement at work and both middle trapezius muscle and right infraspinatus muscle pain thresholds.Keywords: ofce workers, neck disability, fear of movement, neck-shoulder, pain threshold.

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