Evaluation of document location during computer use in terms of neck muscle activity and neck movement

2014 ◽  
Vol 45 (3) ◽  
pp. 767-772 ◽  
Author(s):  
Sonya Goostrey ◽  
Julia Treleaven ◽  
Venerina Johnston
2016 ◽  
Vol 147 ◽  
pp. 613-617
Author(s):  
Gerrit Thiele ◽  
Patricia Kafka ◽  
Stefan Litzenberger ◽  
Anton Sabo
Keyword(s):  

2003 ◽  
Vol 150 (4) ◽  
pp. 458-464 ◽  
Author(s):  
Jean-Sébastien Blouin ◽  
Martin Descarreaux ◽  
Ariane Bélanger-Gravel ◽  
Martin Simoneau ◽  
Normand Teasdale

2020 ◽  
Vol 91 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Roope Sovelius ◽  
Maunu Mäntylä ◽  
Heini Huhtala ◽  
Juha Oksa ◽  
Rasmus Valtonen ◽  
...  

BACKGROUND: The aim of the study was to determine the characteristics of cervical muscle activity in different head movements when using helmet mounted display in air combat maneuvering.METHODS: Cervical EMG was measured with eight F/A-18 pilots using the Joint Helmet Mounted Cueing System (JHMCS) during air combat maneuvering. In-flight Gz acceleration and continuous head position were recorded. Muscular activity was compared between head movements in isolation and combined with torso movement. In addition, the effect of the direction of head movements and the use of head support of the ejection seat on muscle activity was determined.RESULTS: Muscular loading increased in the cervical flexors and extensors when using the torso during targeting beyond the field of vision in the neutral sitting posture; the difference was significant in the flexors, but activity levels were higher in the extensors. Cervical muscles are loaded to a lesser extent if the head is kept in a stable position during Gz loading. Muscular activity in the neck muscles was higher when the pilot was moving the head out of neutral posture rather than toward neutral posture. The use of the headrest as a support decreased muscle activity in the extensors, but resulted in higher activity in the flexor muscles.DISCUSSION: All analyzed conditions were significantly affected by an increase in Gz. An increase of muscle activity with torso movements is considered as a positive factor as it reflects maintained muscular support for the cervical spine. Presented results may be helpful when specific conditioning programs and cockpit ergonomics are developed for fighter pilots.Sovelius R, Mäntylä M, Huhtala H, Oksa J, Valtonen R, Tiitola L, Leino T. Head movements and neck muscle activity during air combat maneuvering. Aerosp Med Hum Perform. 2020; 91(1):26–31.


2020 ◽  
Vol 47 (4) ◽  
pp. 432-440 ◽  
Author(s):  
Simone Gouw ◽  
Angela Frowein ◽  
Carlijn Braem ◽  
Anton Wijer ◽  
Nico H. J. Creugers ◽  
...  

Author(s):  
Frank Lobbezoo ◽  
Marc Thu Thon ◽  
Guy Rémillard ◽  
Jacques Y. Montplaisir ◽  
Gilles J. Lavigne

AbstractObjective: The interactions between sleep, neck muscle activity, and cervical spinal pain were examined in a controlled study with nine patients suffering from idiopathic cervical dystonia (ICD; also referred to as spasmodic torticollis), and nine gender- and age-matched controls. Methods: From each participant, two all-night polysomnograms with additional electromyographic recordings from the sternocleidomastoid and upper trapezius muscles were obtained. The first night was for habituation to the laboratory environment; the second night for experimental data collection. Visual analogue scales were used to collect intensity and unpleasantness ratings of cervical spinal pain before and after the second sleep recording. Results: None of the standard sleep variables showed statistically significant differences between average values of both groups of participants. However, a significantly larger variance in sleep latency was obtained for the ICD patients. In general, abnormal cervical muscle activity decreased immediately when lying down without the intention to go to sleep. Subsequently, abnormal muscle contractions were gradually abolished in all ICD patients during the transition from relaxed wakefulness to light NREM sleep. Following this transition phase, no more abnormal EMG activity was found in any of our patients. Finally, cervical spinal pain intensity and unpleasantness were reduced by about 50% overnight. Conclusions: Both supine position and sleep can be associated with an improvement of symptoms of ICD, and this disorder does not induce any sleep perturbations.


Ergonomics ◽  
2019 ◽  
Vol 62 (12) ◽  
pp. 1524-1533 ◽  
Author(s):  
Suwalee Namwongsa ◽  
Rungthip Puntumetakul ◽  
Manida Swangnetr Neubert ◽  
Rose Boucaut

2017 ◽  
Vol 13 (3-4) ◽  
pp. 119-130 ◽  
Author(s):  
Colin D. McKinnon ◽  
Clark R. Dickerson ◽  
Andrew C.T. Laing ◽  
Jack P. Callaghan
Keyword(s):  

Pain ◽  
1995 ◽  
Vol 60 (2) ◽  
pp. 143-149 ◽  
Author(s):  
X.-M. Yu ◽  
B. J. Sessle ◽  
H. Vernon ◽  
J. W. Hu

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