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https://www.readbyqxmd.com/read/28421126/femoral-neck-strain-during-maximal-contraction-of-isolated-hip-spanning-muscle-groups
#1
Saulo Martelli
The aim of the study was to investigate femoral neck strain during maximal isometric contraction of the hip-spanning muscles. The musculoskeletal and the femur finite-element models from an elderly white woman were taken from earlier studies. The hip-spanning muscles were grouped by function in six hip-spanning muscle groups. The peak hip and knee moments in the model were matched to corresponding published measurements of the hip and knee moments during maximal isometric exercises about the hip and the knee in elderly participants...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/28411326/neck-muscle-emg-force-relationship-and-its-reliability-during-isometric-contractions
#2
Riccardo Lo Martire, Kristofer Gladh, Anton Westman, Björn O Äng
BACKGROUND: Susceptible to injury, the neck is subject to scientific investigations, frequently aiming to elucidate possible injury mechanisms via surface electromyography (EMG) by indirectly estimating cervical loads. Accurate estimation requires that the EMG-force relationship is known and that its measurement error is quantified. Hence, this study examined the relationship between EMG and isometric force amplitude of the anterior neck (AN), the upper posterior neck (UPN), and the lower posterior neck (LPN) and then assessed the relationships' test-retest reliability across force-percentiles within and between days...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28361603/repeatability-of-emg-normalization-of-the-neck-and-shoulder-muscles-in-symptomatic-office-workers
#3
Montakarn Chaikumarn, Nuttika Nakphet, Prawit Janwantanakul
PURPOSE: The purpose of the study was to examine the repeatability of Electromyography (EMG) normalisation in office workers with neck and shoulder symptoms. METHODS: Fifteen female office workers with neck/shoulder symptoms were recruited to participate in two separate days of testing. Maximum voluntary isometric contraction (MVIC) was used for the normalisation of EMG data on the following muscles: cervical erector spinae (CES), upper trapezius (UT), lower trapezius (LT), and anterior deltoid (AD)...
March 31, 2017: International Journal of Occupational Safety and Ergonomics: JOSE
https://www.readbyqxmd.com/read/28304226/integration-of-active-pauses-and-pattern-of-muscular-activity-during-computer-work
#4
Nancy St-Onge, Afshin Samani, Pascal Madeleine
Submaximal isometric muscle contractions have been reported to increase variability of muscle activation during computer work; however, other types of active contractions may be more beneficial. Our objective was to determine which type of active pause vs. rest is more efficient in changing muscle activity pattern during a computer task. Asymptomatic regular computer users performed a standardised 20-min computer task four times, integrating a different type of pause: sub-maximal isometric contraction, dynamic contraction, postural exercise and rest...
March 17, 2017: Ergonomics
https://www.readbyqxmd.com/read/28269625/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#5
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227883/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#6
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Masami Iwamoto, Yuko Nakahira
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28192488/does-dystonic-muscle-activity-affect-sense-of-effort-in-cervical-dystonia
#7
Loïc Carment, Marc A Maier, Sophie Sangla, Vincent Guiraud, Serge Mesure, Marie Vidailhet, Påvel G Lindberg, Jean-Pierre Bleton
BACKGROUND: Focal dystonia has been associated with deficient processing of sense of effort cues. However, corresponding studies are lacking in cervical dystonia (CD). We hypothesized that dystonic muscle activity would perturb neck force control based on sense of effort cues. METHODS: Neck extension force control was investigated in 18 CD patients with different clinical features (7 with and 11 without retrocollis) and in 19 control subjects. Subjects performed force-matching and force-maintaining tasks at 5% and 20% of maximum voluntary contraction (MVC)...
2017: PloS One
https://www.readbyqxmd.com/read/28118272/isometric-exercise-for-the-cervical-extensors-can-help-restore-physiological-lordosis-and-reduce-neck-pain-a-randomized-controlled-trial
#8
Mahmut Alpayci, Server İlter
OBJECTIVE: The aim of this study was to investigate whether isometric neck extension exercise restores physiological cervical lordosis and reduces pain. DESIGN: Sixty-five patients with loss of cervical lordosis were randomly assigned to exercise (27 women, 7 men; mean age, 32.82 ± 8.83 yrs) and control (26 women, 5 men; mean age, 33.48 ± 9.67 yrs) groups. Both groups received nonsteroidal anti-inflammatory drugs for 10 days. The exercise group received additional therapy as a home exercise program, which consisted of isometric neck extension for 3 mos...
January 23, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28089225/-effectiveness-of-an-individualised-physiotherapy-program-versus-group-therapy-on-neck-pain-and-disability-in-patients-with-acute-and-subacute-mechanical-neck-pain
#9
Leonardo Gregorio Antúnez Sánchez, María de la Casa Almeida, Jesús Rebollo Roldán, Antonio Ramírez Manzano, Rocío Martín Valero, Carmen Suárez Serrano
OBJECTIVE: To compare the efficacy in reducing neck pain and disability in an individualised physiotherapy treatment with group treatment in acute and subacute mechanical neck pain. DESIGN: Randomised clinical trial. LOCATION: Health Area of University Hospital Virgen del Rocío, Seville, Spain. PARTICIPANTS: A total of 90 patients diagnosed with mechanical neck pain of up to one month onset, distributed randomly into two groups: (i)individualised treatment; (ii)group treatment...
January 11, 2017: Atencion Primaria
https://www.readbyqxmd.com/read/27941995/characteristics-of-the-motor-units-during-sternocleidomastoid-isometric-flexion-among-patients-with-mechanical-neck-disorder-and-asymptomatic-individuals
#10
Chia-Chi Yang, Fong-Chin Su, Po-Ching Yang, Hwai-Ting Lin, Lan-Yuen Guo
Mechanical neck disorder is a widespread and non-neurological musculoskeletal condition resulting from modern lifestyles. Presently, the fundamental electrophysiological properties of the motor units of the sternocleidomastoid muscles and the characteristics of the short-term synchronization of the motor unit in patients with neck pain are ambiguous. This study therefore aims to clarify the fundamental electrophysiological properties of the motor units of the sternocleidomastoid muscles in patients with mechanical neck disorder and in asymptomatic individuals...
2016: PloS One
https://www.readbyqxmd.com/read/27913924/shear-wave-elastography-reveals-different-degrees-of-passive-and-active-stiffness-of-the-neck-extensor-muscles
#11
Angela V Dieterich, Ricardo J Andrade, Guillaume Le Sant, Deborah Falla, Frank Petzke, François Hug, Antoine Nordez
PURPOSE: The neck extensor muscles contribute to spinal support and posture while performing head and neck motion. Muscle stiffness relates to passive elasticity (support) and active tensioning (posture and movement) of muscle. It was hypothesized that support and motion requirements are reflected in the distribution of stiffness between superficial and deep neck extensor muscles. METHODS: In ten healthy participants, shear modulus (stiffness) of five neck extensor muscles was determined in prone at rest and during isometric head lift at three intensities using shear wave elastography...
December 2, 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27899787/mcardle-disease-misdiagnosed-as-meningitis
#12
Renata Siciliani Scalco, Sherryl Chatfield, Muhammad Hyder Junejo, Suzanne Booth, Jatin Pattni, Richard Godfrey, Ros Quinlivan
BACKGROUND McArdle disease is a glycogen storage disorder mainly characterized by exercise intolerance. Prolonged muscle contracture is also a feature of this condition and may lead to rhabdomyolysis (RM), which is a serious event characterized by acute skeletal muscle damage.  CASE REPORT A 44-year-old female patient presented with an acute contracture of the posterior neck muscles, causing severe nuchal rigidity. The contracture was induced during a dental extraction as she held her mouth open for a prolonged period, with her neck in a rigid position...
November 30, 2016: American Journal of Case Reports
https://www.readbyqxmd.com/read/27895619/a-functional-magnetic-resonance-imaging-study-of-head-movements-in-cervical-dystonia
#13
Cecília N Prudente, Randall Stilla, Shivangi Singh, Cathrin Buetefisch, Marian Evatt, Stewart A Factor, Alan Freeman, Xiaoping Philip Hu, Ellen J Hess, K Sathian, H A Jinnah
Cervical dystonia (CD) is a neurological disorder characterized by abnormal movements and postures of the head. The brain regions responsible for these abnormal movements are not well understood, because most imaging techniques for assessing regional brain activity cannot be used when the head is moving. Recently, we mapped brain activation in healthy individuals using functional magnetic resonance imaging during isometric head rotation, when muscle contractions occur without actual head movements. In the current study, we used the same methods to explore the neural substrates for head movements in subjects with CD who had predominantly rotational abnormalities (torticollis)...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27834549/differential-strength-and-endurance-parameters-of-the-craniocervical-and-cervicothoracic-extensors-and-flexors-in-healthy-individuals
#14
Shaun O Leary, Charlotte Loraas Fagermoen, Hiroyuki Hasegawa, Ann-Sofi Slettevold Thorsen, Luke Van Wyk
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 six strength and endurance ratios were calculated. The findings showed that the cervical extensor muscles are not only much stronger than the flexors (1...
November 11, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27632843/the-effectiveness-of-cervical-strengthening-on-decreasing-neck-injury-risk-in-wrestling
#15
Katherine Lee, James Onate, Samar McCann, Tamerah Hunt, Wilbert Turner, Mark Merrick
Clinical Scenario: In wrestling, athletes often support a large amount of weight on their heads or are forced into extreme ranges of motion. These suboptimal movement conditions lead to a high prevalence of neck injuries in wrestlers. A large portion of the work done by the cervical musculature in wrestling is theorized to be eccentric or isometric types of contractions. Strengthening of these cervical muscles is clinically considered to play a vital role in being competitive on the wrestling mat. The cervical stability provided by strengthening these muscles may also play a part in injury prevention among wrestlers...
August 24, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27141794/-research-progress-in-strategy-of-lateral-femoral-offset-reconstruction-in-total-hip-arthroplasty
#16
REVIEW
Qiu-ping Fan, Bo Wang, Wei-ping Ji
As an important indicator of total hip arthroplasty (THA) the rate and degree of offset reconstruction play an important role in improving the prognosis and life quality of patients. The reconstruction of femoral offset is closely related to reserved length of calcar femorale, the head and neck length of prosthesis, angle degree of neck shaft and whether lower limb is isometric. Reconstruction strategy includes making a meticulous and standard measurement before the surgery, predicting the reserved length of calcar femorale, selecting a prosthesis with approximate anatomical neck-shaft angle and reconstructing offset by adjusting the head and neck length of the prosthetic during the operation...
February 2016: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/27077266/comparison-of-isometric-force-of-the-craniocervical-flexor-and-extensor-muscles-between-women-with-and-without-forward-head-posture
#17
Fateme Bokaee, Asghar Rezasoltani, Farideh Dehghan Manshadi, Sedigheh Sadat Naimi, Alireza Akbarzadeh Baghban, Hadi Azimi
OBJECTIVE: The stability of the craniocervical (CC) area is provided by CC muscles. Muscle imbalance between forces of these muscles may lead to forward head posture (FHP). FHP is one of the most prevalent abnormal postures in patients with neck pain. The aim of the present study was to compare isometric force of the CC flexor and extensor muscles between women with and without FHP. METHOD: Isometric force of the CC flexor and extensor muscles was measured by a custom-made device and compared between 70 women with and without FHP (35 in each group)...
September 2016: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/26970701/decreased-neck-muscle-strength-in-patients-with-the-loss-of-cervical-lordosis
#18
Mahmut Alpayci, Emre Şenköy, Veysel Delen, Volkan Şah, Levent Yazmalar, Metin Erden, Murat Toprak, Şeyhmus Kaplan
BACKGROUND: The loss of cervical lordosis is associated with some negative clinical outcomes. No previous study has examined cervical muscle strength, specifically in patients with the loss of cervical lordosis. This study aims to investigate whether there is weakness of the cervical muscles or an imbalance between cervical flexor and extensor muscle strength in patients with the loss of cervical lordosis compared with healthy controls matched by age, gender, body mass index (BMI), and employment status...
March 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/26938773/investigation-of-the-differential-contributions-of-superficial-and-deep-muscles-on-cervical-spinal-loads-with-changing-head-postures
#19
Chih-Hsiu Cheng, Andy Chien, Wei-Li Hsu, Carl Pai-Chu Chen, Hsin-Yi Kathy Cheng
Cervical spinal loads are predominately influenced by activities of cervical muscles. However, the coordination between deep and superficial muscles and their influence on the spinal loads is not well understood. This study aims to document the changes of cervical spinal loads and the differential contributions of superficial and deep muscles with varying head postures. Electromyography (EMG) of cervical muscles from seventeen healthy adults were measured during maximal isometric exertions for lateral flexion (at 10°, 20° and terminal position) as well as flexion/extension (at 10°, 20°, 30°, and terminal position) neck postures...
2016: PloS One
https://www.readbyqxmd.com/read/26896035/validity-of-commonly-used-clinical-tests-to-diagnose-and-screen-for-spinal-pain-in-adolescents-a-school-based-cohort-study-in-1300-danes-aged-11-15-years
#20
Ellen Aartun, Jan Hartvigsen, Lise Hestbaek
OBJECTIVE: The overall aim of this study was to determine the ability of 2 selected clinical tests to detect or predict neck pain, mid back pain, and low back pain in a school-based cohort of Danish 11- to 15-year-olds. METHODS: A school-based 2-year prospective cohort study was conducted. Data were collected at the age of 11 to 13 (n = 1224) and 2 years later (n = 963). Spinal pain (neck pain, mid back pain, and low back pain) was assessed by an electronic survey completed during school time, and reference standard was defined as both lifetime prevalence and frequent pain as a proxy of severity...
February 2016: Journal of Manipulative and Physiological Therapeutics
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