Neck Flexor Endurance Research Articles

The Effects of cervical mobilization and clinical pilates exercises in cervicogenic headache: randomized controlled trial.

To investigate the effects of Cervical Mobilization (CM) and Clinical Pilates Exercises (CPE) in Cervigogenic Headache (CHA). The 37 patients were randomized into the 3 groups. The CM for 1st group, CPE for 2nd group and CM+CPE for 3rd group were applied 3 days/a week for 6 weeks. Pain frequency, pain intensity, number of analgesic, were recorded. The posture was measured by Posture Screen application, the cervical range of motion by the CROM device, deep neck flexor muscle endurance by the pressurized biofeedback device. Evaluations were applied 2 times as pre-post treatment. In within-group comparison a decrease in pain parameters, neck-shoulder postural deviation and an increase DNFE and CROM were observed in all groups (p<0.05). In between-group comparison pain frequency, intensity and number of analgesics were significant changes in the CM and CM+CPE groups according to CPE (respectively p<0,001, p=0,001, p=0,018). Head and shoulder angulation were significant in the CPE and CM+CPE groups according to CM (respectively p=0.009, p=0,011). It was determined that the cervical right lateral flexion range of motion and right rotation were significant changes in the CM and CM+CPE groups according to CPE (respectively p=0,026, p=0,040). DNFE were significantly increased in CM+CPE according to CM and CPE (p=0.001). This study suggests that it would be beneficial to add CM and CPE to the treatment plans of patients with CHA.

Normative Scores and Test-Retest Reliability of Neck Strength, Endurance, and Proprioception Tests in Children and Adolescents

OBJECTIVE: To determine normative scores, test-retest reliability, and minimal detectable change for the neck flexor endurance test (NFET), craniocervical flexion test (CCFT), and joint position error test (JPET) in children. DESIGN: Cross-sectional. METHODS: Two hundred typically developing children (10-15 years) were recruited. Participants were screened for cervical spine instability using the alar and transverse ligament tests prior to administering the NFET, CCFT, and JPET. Testing was performed twice on the same day, 6 hours apart. RESULTS: For the younger age group, average NFET scores were as follows: females = 9.1 seconds, males = 10.1 seconds. Mean CCFT scores decreased with an increase in pressure (22 millimeters of mercury [mmHg]: females = 6.1 seconds [1], males = 6.8 seconds [1]; 30 mmHg: females = 4.07 seconds [1.1], males = 4.1 seconds [0.9]). For the CCFT, reliability reduced as pressure increased. The JPET had moderate reliability (ICC2, k = 0.4-0.63) with the highest error in right rotation (females = 14.1 cm [5], males = 13.4 cm [4.7]). The NFET had excellent reliability (ICC2, k = 0.96 [0.94-0.97], P&lt;.001). CONCLUSION: The normative scores presented serve as a reference standard for future studies and for systematic screening and head and neck injury prevention. JOSPT Open 2024;2(4):348-353. Epub 20 May 2024. doi:10.2519/josptopen.2024.1135

Differences in physical examination findings between those who present with or without headache soon after a whiplash injury: a cross-sectional study

ABSTRACT Aim To determine differences in physical examination findings between people with acute whiplash-associated disorders (WAD) with and without headache. Methods In this cross-sectional study, participants with acute WAD were evaluated to assess differences in the presence of physical impairments. The following were assessed: pain intensity on manual palpation the over spinous process of C1-C3, zygapophyseal joints of C0-C4, and trapezius, sternocleidomastoid, suboccipitalis, masseter and temporalis muscles; cervical range of motion (ROM); flexion-rotation test (FRT); forward head posture; cranio-cervical flexion test (CCFT); neck flexor and extensor endurance; pressure-pain thresholds (PPT) over neural structures and upper limb neural tests (ULNT) in addition to median UNLT + CCF. Correlation analyses were performed to assess the association between examination findings and headache intensity. Logistic regression and discriminant analyses were also performed. Results Forty-seven participants (26 men and 21 women; mean age = 38.9 years old) were included in the study. 60% of the participants presented with headache. Several examination findings were significantly different between groups. A group of examination findings composed of neck endurance, manual palpation over cervical and muscular structures, PPT, CCFT, ROM and FRT could discriminate between groups with a sensitivity of 86.7% and specificity of 90%. Conclusions Several neuromusculoskeletal features are different between people with acute WAD with or without headache. A combination of features could distinguish between groups with high levels of sensitivity and specificity.

The Effects of Deep Neck Muscle Exercises on Chronic Non-Specific Neck Pain

Introduction: The study aimed to investigate the effects of deep neck flexor (DNF) and deep neck extensor (DNE) muscle exercises on pain, passive range of motion (PROM), craniovertebral angle (CVA), neck flexor endurance (NFE), neck extensor endurance (NEE), and the number of weekly painkiller usage (NWPKU) in chronic non-specific neck pain (CNNP) patients. Materials and Methods: A total of 27 CNNP patients, incuding intervention group (n=15) and control group (n=12), were recruited for this study. Patients in the intervention group participated in 6 weeks of DNF and DNE exercises plus traditional physiotherapy. After 10 sessions (3 weeks), the exercise protocol was followed for 3 weeks of the home-based exercise form. Control group patients received traditional physiotherapy alone. The numeric pain rating scale (NPRS), PROM, CVA, NFE, NEE, and NWPKU were examined and compared between groups, at the baseline and after six weeks. Results: Numeric pain rating scale, PROM, CVA, NFE, NEE, and NWPKU improved significantly in both groups after treatment (P&lt;0.001). The NPRS, passive flexion, passive extension, passive right-side bending, passive left rotation, CVA, NFE, NEE, and NWPKU differences were significant (P&lt;0.05). Conclusion: The study supports the positive effects of combination therapy (DNF and DNE exercises plus traditional physiotherapy) on pain, passive neck range of motion, neck lordosis posture, and neck muscle endurance in CNNP patients.

Effect of hamstring flexibility on cervical range of motion and deep neck flexor endurance in healthy young adults: A study to explore myofascial tensegrity network

IntroductionAccording to the concept of biotensegrity, the whole body consists of fascial lines. The relationship between muscles and fascia is important to ensure full and proper range of motion. This study investigated the effect of hamstring flexibility on cervical range of motion and deep neck flexor muscle endurance. The aim was to explore the relationship between the hamstring muscles and neck region in the myofascial tensegrity network. MethodSixty healthy participants with a median age of 22.0 years (24 male, 36 female) were included. Hamstring flexibility was categorized as “normal (n = 31)” or “limited (n = 29)” according to hip flexion angle (HFA) using the passive straight leg raise (PSLR) test. Active cervical range of motion was measured by the Clinometer smartphone application, and the following movements were recorded: flexion, extension and lateral flexion. The craniocervical flexion test was performed to evaluate deep neck flexor endurance using performance index and highest-pressure score. The Mann-Whitney U test was used for statistical analysis. ResultsNo significant differences in cervical range of motion were observed between the groups (p > 0.05). Participants with limited hamstring flexibility presented lower deep neck flexor muscle endurance scores (performance index and highest-pressure score) than participants with normal hamstring flexibility (p = 0.002, and p = 0.012, respectively). ConclusionThe results suggest that hamstring flexibility can influence deep neck flexor muscle endurance in healthy young adults. This preliminary clinical finding supports the hypothesis of a myofascial network between the hamstring muscles and neck region.

The effect of craniocervical flexion and neck endurance exercises plus pulmonary rehabilitation on pulmonary function in spinal cord injury: a pilot single-blinded randomised controlled trial.

Randomised controlled trial with computerised allocation, assessor blinding and intention-to-treat analysis. This study wanted to prove that cervicocranial flexion exercise (CCFE) and superficial neck flexor endurance training combined with common pulmonary rehabilitation is feasible for improving spinal cord injury people's pulmonary function. Taoyuan General Hospital, Ministry of Health and Welfare: Department of Physiotherapy, Taiwan. Thirteen individuals who had sustained spinal cord injury for less than a year were recruited and randomised assigned into two groups. The experimental group was assigned CCFEs and neck flexor endurance training plus normal cardiopulmonary rehabilitation. The control group was assigned general neck stretching exercises plus cardiopulmonary rehabilitation. Lung function parameters such as forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), FEV1/FVC, peak expiratory flow rate (PEFR), inspiratory capacity (IC), dyspnoea, pain, and neck stiffness were recorded once a week as short-term outcome measure. The experimental group showed significant time effects for FVC (pre-therapy: 80.4 ± 21.4, post-therapy: 86.9 ± 16.9, p = 0.021, 95% CI: 0.00-0.26) and PEFR (pre-therapy: 67.0 ± 33.4; post-therapy: 78.4 ± 26.9, p = 0.042, 95% CI: 0.00-0.22) after the therapy course. Furthermore, the experimental group showed significant time effects for BDI (experimental group: 6.3 ± 3.0; control group: 10.8 ± 1.6, p = 0.012, 95% CI: 0.00-0.21). The exercise regime for the experimental group could efficiently increase lung function due to the following three reasons: first, respiratory accessory muscle endurance increases through training. Second, posture becomes less kyphosis resulting increasing lung volume. Third, the ratio between superficial and deep neck flexor is more synchronised. TYGH108045. NCT04500223.

Effect of pain on cranio-cervico-mandibular function and postural stability in people with temporomandibular joint disorders.

Neck and jaw pain is common and is associated with jaw functional limitations, postural stability, muscular endurance, and proprioception. This study aimed to investigate the effect of jaw and neck pain on craniocervico- mandibular functions and postural stability in patients with temporomandibular joint disorders (TMJDs). Fifty-two patients with TMJDs were included and assessed using Fonseca's Questionnaire and the Helkimo Clinical Dysfunction Index. An isometric strength test was performed for the TMJ depressor and cervical muscles. The TMJ position sense (TMJPS) test and cervical joint position error test (CJPET) were employed for proprioception. Total sway degree was obtained for the assessment of postural stability. Deep neck flexor endurance (DNFE) was assessed using the craniocervical flexion test. The mandibular function impairment questionnaire (MFIQ) was employed to assess mandibular function, and the craniovertebral angle (CVA) was measured for forward head posture. Jaw and neck pain negatively affected CVA (R2 = 0.130), TMJPS (R2 = 0.286), DNFE (R2 = 0.355), TMJ depressor (R2 = 0.145), cervical flexor (R2 = 0.144), and extensor (R2 = 0.148) muscle strength. Jaw and neck pain also positively affected CJPET for flexion (R2 = 0.116) and extension (R2 = 0.146), as well as total sway degree (R2 = 0.128) and MFIQ (R2 = 0.230). Patients with painful TMJDs, could have impaired muscle strength and proprioception of the TMJ and cervical region. The jaw and neck pain could also affect postural stability, and the endurance of deep neck flexors as well as mandibular functions in TMJDs.

The Effect of Exercise-Induced Central Fatigue on Cervical Spine Joint Position Error, Strength, and Endurance.

Fatigue is common in sports, impairing performance and increasing injury risk, yet little is known regarding fatigue and concussion. Impaired neck neuromuscular function may contribute to concussion at baseline, where central fatigue may further impair neck function resulting in increased concussion risk. These effects may be magnified in athletes with a history of concussion. To determine the effect of exercise induced central fatigue on neck joint position error, strength, and endurance in healthy subjects and those with a history of concussion. The investigators hypothesized that EICF would have a negative effect on all variables. Healthy subjects were examined using a single factor, within-subjects repeated measures design. Concussion history subjects were examined using a single-subject design. Nineteen healthy subjects and five subjects with a history of concussion were recruited for the study. Cervical joint position error, muscle strength, and neck flexor endurance were tested before and after exercise induced fatigue. There was a significant increase in constant (p = 0.0027) and absolute joint position error (JPE) (p < 0.001); decrease in neck flexor endurance (p < 0.001); and decrease neck strength into cervical flexion (p = 0.01) in healthy subjects following fatigue. Among concussion history subjects, five demonstrated a significant increase in absolute and constant JPE (p < 0.05); four demonstrated a significant decrease in neck flexor endurance (p < 0.05); one in neck flexion muscle strength (p < 0.05); and three in neck extension and rotation muscle strength (p < 0.05) following fatigue. Cervical neuromuscular function deteriorated following fatigue in healthy subjects. Resulting impairments may affect force alterations in cervical control, potentially increasing concussion risk. Concussion history subjects descriptively demonstrated similar results, however further research should examine formal comparisons involving subjects with and without concussion history. 3b.

İNMELİ HASTALARDA EKSPİRATUAR KAS EĞİTİMİNİN STOMATOGNATİK SİSTEME ETKİSİ

Objective: The aim of this study was to assess the effect of expiratory muscle training on the stomatognathic system in patients with stroke.&#x0D; Method: A total of 31 patients with stroke were included in the study: 16 patients with stroke (age=66.63±8.38, height=166.38±8.59, BMI=28.09±4.81) as the control group and 15 patients with stroke (age=65.60±7.62, height=168.20±8.78, BMI=28.95±6.92) as the study group. Temporomandibular joint range of motion and dysfunction, pressure pain threshold of masticatory muscles, facial asymmetry existence, head posture, oral hygiene, oral hygiene habit, masticatory performance, intraoral pH, deglutition, and deep neck flexor muscle endurance of the patients with stroke were assessed. Assessment methods were in order by digital caliper, the Fonseca Questionnaire, algometry, labial commissure and craniocervical angle measurement, general oral health assessment index, and questionnaire, sieve test, digital pH gauge, repetitive saliva swallow test, Eating Assessment Tool, and deep neck flexor endurance test. Patients with stroke in the study group were enrolled in an expiratory muscle training program consisting of 5 sets of 10 repetitions daily for three weeks in addition to conventional physiotherapy; the control group enrolled in the conventional physiotherapy program. Patients with stroke in the study group were called twice a week to assess their compliance with the expiratory muscle training.&#x0D; Results: In intragroup comparison significant increase was found in the inferior portion of the left masseter, mandibular protrusion, and a decrease in labial commissure angle and Fonseca Questionnaire score of the control group (p

Is device guided training targeted to the craniocervical flexor and extensor muscles efficacious? A preliminary randomized controlled trial in a cervicogenic headache population

BackgroundSpecific neck exercise is effective in the management of cervicogenic headache (CH). The Spinertial device was designed to facilitate craniocervical flexion and extension training, but its efficacy, judged on change in headache impact, has not been tested. ObjectiveTo compare guided and progressive resisted specific neck exercise targeted to the craniocervical flexors and extensors (SNE-fe) performed with Spinertial device to progressive SNE-fe without the device in a cohort with CH. DesignRandomised controlled trial. MethodsTwenty-eight participants with CH were randomly allocated to the Spinertial group (SG) or SNE-fe exercise group without the device (EG). Both groups performed 12 sessions of SNE-fe over six-weeks. The primary outcome was headache impact (HIT-6). Secondary outcomes were the craniocervical flexion test (CCFT), upper cervical (UCS) and lower cervical range of movement, flexion rotation test (FRT) analysed as more or less restricted side (MRS, LRS), the self-reported global rating of change (GROC-scale) and satisfaction with the exercise program (PACES). Outcomes were measured at baseline, post-intervention (T1) and after 1-month (T2). ResultsSignificant between-groups differences were found favouring the SG for HIT-6 (T1 p = 0.010, d = 0.5; T2 p < 0.004, d = 0.4), CCFT, UCS ROM, FRT MRS, FRT LRS, PACES and GROC-scale (T1: all p < 0.01; T2: all p < 0.01). Effects sizes were large (>0.8) at T1 and T2. No between-groups differences were found for lower cervical ROM. ConclusionTraining with the Spinertial was more effective than SNE without the device for improving the impact of headache, the endurance of deep neck flexors and UCS ROM in participants with CH.

Effects of exercise therapy using elastic bands on strength and pain in women with non-specific neck pain: A randomised controlled trial

BackgroundCervical pain has a high incidence and worldwide socio-economic effect. Its incidence is lower in men than in women. Conservative and non-pharmacological therapeutic options include strength training. Elastic bands are commonly used in physiotherapy clinics for strength work in patients. Consequently, the objective of this research was to analyse the efficacy of an exercise therapy programme using elastic bands on decreasing pain and increasing strength of the neck flexor musculature, cervical extensor, and scapular stabilizing musculature in women suffering from non-specific cervical pain. MethodsA randomised clinical trial was carried out with 35 subjects with non-specific neck pain (age = 51.7 ± 9.5 and baseline intensity of pain in Visual Analogue Scale = 52.4 ± 9.6). The experimental group (n = 18) performed the exercise programme with elastic bands, consisting of a total of 16 sessions that lasted 45 min. The control group, consisting of 27 participants, reported that they maintained their usual lifestyle throughout the study. The evaluation tools used in this research included the Visual Analogue Scale, Neck Flexor Endurance Test, Neck Extensor Muscle Endurance Test, and Scapular Muscle Endurance Test. ResultsThe experimental group obtained significant improvements in the measurements taken using the Visual Analogue Scale (p < 0.001, d = 4.2), the Neck Flexor Endurance Test (p < 0.001, d = 3.4), the Neck Extensor Endurance Test (p < 0.001, d = 6.3), in the Scapular Muscle Endurance Test (p = 0.016, d = 0.9). ConclusionsThe assessed exercise therapy program utilizing elastic bands demonstrated favorable outcomes in managing non-specific neck discomfort. This intervention resulted in pain reduction and enhanced endurance of the cervical flexor and extensor muscles, along with improved endurance of the scapular stabilizing muscles.Protocol registration in ClinicalTrials.gov: NCT05433649 (registered prospectively, date of registration: June 27, 2022).

The effect of deep neck flexor endurance on craniovertebral angle changes and neck and shoulder muscle activities during a computer task

ABSTRACT The deep neck flexors are important for maintaining neck posture by stabilizing and supporting it through low-intensity contraction, ensuring static endurance. The subjects performed computer tasks after having their deep neck flexor endurance measured using a pressure biofeedback unit. The craniovertebral angle (CVA) and the muscle activities were measured while participants were completing computer tasks for 10 min. The deep neck flexor endurance was significantly negatively correlated with CVA changes at 0–2 min. The deep neck flexor endurance was significantly negatively correlated with sternocleidomastoid muscle and upper trapezius activity at 0–2 min. The deep neck flexor endurance negatively predicted CVA changes at 0–2 min and explained 28.8% of the variance in the CVA changes. The lower the deep neck flexor endurance, the earlier the simultaneous changes occurred in the CVA and the neck and shoulder muscle activities during computer tasks.

Network analyses reveal the interaction between physical features, fear of movement and neck pain and disability in people with acute and chronic whiplash-associated disorders.

A network analysis can be used to quantitatively assess and graphically describe multiple interactions. This study applied network analyses to determine the interaction between physical and pain-related factors and fear of movement in people with whiplash-associated disorders (WAD) during periods of acute and chronic pain. Physical measurements, including pressure pain-thresholds (PPT) over neural structures, cervical range of motion, neck flexor and extensor endurance and the cranio-cervical flexion test (CCFT), in addition to subjective reports including the Tampa Scale of Kinesiophobia (TSK-11), Neck Disability Index (NDI) and neck pain and headache intensity, were assessed at baseline in 47 participants with acute WAD. TSK-11, NDI and pain intensity were assessed for the same participants 6 months later (n = 45). Two network analyses were conducted to estimate the associations between features at baseline and at 6 months and their centrality indices. Both network analyses revealed that the greatest weight indices were found for NDI and CCFT at baseline and for neck pain and headache intensity and NDI and TSK-11 at both time points. Associations were also found betweeen cervical muscle endurance and neck pain intensity in the acute phase. Cervical muscle endurance assesssed during the acute phase was also associated with NDI after 6 months - whereas PPT measured at baseline was associsated with headache intensity after 6 months. The strongest associations were found for headache and neck pain intensity and neck disability and fear of movement, both during acute pain and when mesured 6 months later. The extent of neck endurance and measures of PPT at baseline may be associated with neck disability and headache, respectively, 6 months after a whiplash injury. Through two network analyses, we evaluated the interaction between pain-related factors, fear of movement, neck disability and physical factors in people who had experienced a whiplash injury. We demonstrated that physical factors may be involved in the maintenance and development of chronic pain after a whiplash injury. Nevertheless, the strongest associations were found for headache and neck pain intensity and neck disability and fear of movement, both during acute and chronic phases.

Impact of Jaw Functional Status on Neck Flexor Endurance among Females

Background: Opening and closing of the mouth, biting, and chewing are all sensory-motor tasks that require both jaw and neck muscles to be contracted simultaneously. The postural stability of healthy people can be modified by changes in the position of the jaw. Objective: To determine the impact of jaw functional status on neck flexor endurance among females and also to determine the association of neck flexion endurance with age and BMI. Methods: It was a cross-sectional study in which the convenient sampling technique was used. It included 32 healthy females between 18-25 years of age. The study was conducted at the skills Lab of Shalamar School of Allied Health Sciences, Lahore. After consent from participants the neck flexor endurance test was performed in two positions: with the resting jaw (position I), and the jaw clenched maximally (position II) in the supine position. Time was recorded by the stopwatch to see how long the participant was able to maintain in these positions. The same test was performed again with five minutes gap in both positions of the jaw. Results: It shows that there was a significant difference in neck holding time between the resting jaw position and clenched jaw position. After five minutes of rest the neck holding time in both positions was decreased but it was statistically not significant. There was weak and inverse relationship between neck flexion endurance and age (r=-0.0264) and weak but direct relationship between neck flexion endurance and BMI (r=0.283) Conclusion: The neck holding time in the clenched jaw position is less than the resting jaw position; this shows that a sensory-motor relationship exists between the neck and jaw. Variation in jaw positioning impacts neck flexor endurance.

Association of Neck Pain with Neck Flexors Endurance in School Going Students

Association of Neck Pain with Neck Flexors Endurance in School Going Students

Effect of instrument-assisted soft tissue mobilization combined with exercise therapy on pain and muscle endurance in patients with chronic neck pain: a randomized controlled study

ABSTRACT Objectives The use of instrument-assisted soft tissue mobilization (IASTM) has been documented to be effective for improving pain and function, but it is unclear whether it helps improve muscle performance in musculoskeletal diseases. This study investigated the effects of IASTM combined with exercise therapy on muscle endurance and pain intensity in patients with chronic neck pain. Methods Forty-eight individuals with chronic neck pain were randomly divided into exercise therapy (ET, n = 24) and combined therapy (CT, n = 24) groups. For 4 weeks, each group underwent exercise therapy 3 days a week for a total of 12 sessions. The ET group received exercise therapy only. The CT group received IASTM combined with exercise therapy twice per week for a total of 8 sessions. The muscle endurance of the participants was assessed with the Deep Neck Flexor Muscle Endurance (DNFE) test and pain intensity with Visual Analogue Scale (VAS) at baseline and post-treatment. Results While both groups showed significant improvement in pain intensity (p < 0.05), the CT group showed a greater effect size for pain (CT group: Cohen’s d = 3.28; ET group: Cohen’s d = 2.12). The CT group showed significant improvement for muscle endurance (p < 0.05), whereas the ET group did not (p > 0.05). Conclusion In the current study, the IASTM intervention combined with ET improved pain and muscular endurance in participants with chronic neck pain compared to exercise therapy alone. As an alternative method, IASTM intervention before exercise seems to increase the short-term recovery effect in chronic neck pain conditions.

Relationships between cervical sagittal posture, muscle endurance, joint position sense, range of motion and level of smartphone addiction

BackgroundFrequent smartphone use in a pathological way forces the user to adopt a compromised posture. This gradually results in changes to both the postural and musculoskeletal systems. This study’s objectives were evaluation of head posture, muscle endurance, neck range of motion (ROM) and joint position sense in two separate smartphone user groups, one ‘Addicted’, the other ‘Non-Addicted’.MethodsA sample of convenience (n = 60) was recruited from medical students (age 24.57 ± 4.38, 53.3% male) with a history of smartphones use > 2 h/day for 1-year. Based on the cut-off values of the smartphone addiction scale-short version (SAS-SV), participants were entered into each group (cut-off for male ≥ 31, female ≥ 33). Neck muscle endurance time, joint position error and cervical ROM, along with forward head posture parameters of craniovertebral angle (CVA), shoulder angle (SA), sagittal head angle (SHA) and forward head distance (FHD)) were evaluated. A Mann–Whitney test and Spearman correlation coefficient were used to determine the difference between groups and the correlations between variables.ResultsThe difference between ‘Addicted’ and ‘Non-Addicted’ groups was confirmed by the values for SAS-SV scores (25.23 ± 5.5 versus 43.9 ± 6.61) (p < 0.001). There were statistically significant differences between groups for the CVA and FHD parameters (p < 0.001). Further, the neck extensor muscle endurance (97 ± 3.79 versus 74.86 ± 2.23 s), was significantly different between groups (p = 0.010) but not after Bonferroni correction. There was no notable difference in the neck flexor muscle endurance, joint position error, SA, and SHA parameters between groups (p > 0.05).ConclusionsThere is a positive correlation between smartphone addiction and both decreased extensor muscle endurance and changes in neck postural alignment.

Assessment of stiffness of the superficial neck muscles in female office workers with impaired endurance of deep neck flexors: a case-control study

IntroductionThe objective of this study was to assess the muscle stiffness parameter in the sternocleidomastoid (SCM) and upper trapezius (UT) in a group of office workers who did not attain the norm in the deep endurance flexor test (DEFT).MethodsIn this case-control study, the myotonometric muscle stiffness parameter (MyotonPro, Tallin, Estonia) was compared in the SCM and UT muscles in a group of female office workers who were unable to achieve the norm in the DEFT, i.e. the research group (RG), in comparison to the control group (CON) who attained the norm during the test. Subjects were matched in terms of their gender, age, BMI, nature and duration of their work, as well as the pain intensity and craniovertebral angle.ResultsSubjects in the RG had significantly higher stiffness of the UT (by 8.8%, 291.4 ± 36.5 in RG and 265.9 ± 25.6 in CON; p = 0.015, t = 2.29) and SCM (by 7.3%, 291.4 ± 36.5 in RG and 265.9 ± 25.6 in CON; p = 0.37, t = 1.85) myofascial tissue in comparison with the CON. The magnitude of the effects of the stiffness of the tested muscles on the results obtained by DEFT was stronger in the UT (Cohen’s d = 0.82, large effect size) than the SCM (Cohen’s d = 0.61, medium effect size).ConclusionsThe women who did not attain the norm in the DEFT had greater stiffness of the superficial UT and SCM muscles. Future studies should evaluate whether SCM and UT stiffness reduction therapy will improve the deep endurance flexor test results.

Fat Infiltration of Multifidus Muscle Is Correlated with Neck Disability in Patients with Non-Specific Chronic Neck Pain.

Background: Chronic non-specific neck pain (CINP) is common, but the etiology remains unclear. This study aimed to examine the relationship between cervical muscle composition (cervical multifidus and longus capitis/longus colli), morphometry, range of movement, muscle function, and disability severity (Neck Disability Index) in patients with CINP. Methods: From September 2020 to July 2021, subjects underwent cervical MRI and clinical tests (cervical range of motion, cranio-cervical flexion test, neck flexor, and extensor muscle endurance). MRI analysis comprised muscle cross-sectional area, volume, and fat infiltration of multifidus and longus colli between C4 and C7 levels. Results: Twenty-five participants were included. Multiple linear regression analysis indicated that NDI was positively correlated with the volume percentage of fat infiltration of the multifidus (B = 0.496), negatively correlated with fat-free muscle volume of the multifidus normalized by subject height (B = −0.230), and accounted for 32% of the variance. There was no relationship between neck disability and longus capitis/longus colli morphology. We also found no relationship between neck disability scores, neck flexor or extensor muscle endurance, or the outcome motor control test of craniocervical flexion (p > 0.05). Conclusions: Neck disability was moderately correlated with the percentage of fat volume in the multifidus muscle and fat-free volume of the multifidus. There was no relationship between NDI scores and muscle function test outcomes or any fat or volume measures pertaining to the longus colli muscle.

Correlation of Intensity of Pain, Functional Disability and Deep Neck Flexor Endurance in Individual with Chronic Non-Specific Neck Pain: An Observational Study

Background: Musculoskeletal deficits of the craniocervical region play an important role in causing various cervical disorders. Cervical disorders and neck pain are almost as prevalent as low back pain and like low back pain; in most of the cases it is difficult to determine the actual cause of neck pain hence it is regarded as “non-specific neck pain”. This study was conducted to determine the correlation between deep neck flexor endurance, the intensity of pain, and functional disability in individuals with chronic non-specific neck pain. Materials and methods: A cross-sectional observational study was conducted on twenty individuals with chronic non-specific neck pain. Numerical Pain Rating Scale (NPRS), Neck Disability Index (NDI), and Craniocervical Flexion Test (CCFT) were used to measure neck pain intensity, neck disability, and deep neck flexor endurance respectively. The correlation was found using the Pearson Correlation Coefficient test. Result: The results showed that there was a positive correlation found between NPRS and NDI, and CCFT has negative correlations with NPRS and NDI respectively. Conclusion: The findings suggest that the lesser deep neck flexor endurance corresponded to greater neck pain intensity and disability. Keywords: cervical spine, neck disability index, neck pain, craniocervical flexion test, deep neck flexors endurance, correlation.