scholarly journals Sex Differences in Neck Strength Force and Activation Patterns in Collegiate Contact Sport

2021 ◽  
pp. 68-73
Author(s):  
Caitlin A. Gallo ◽  
Gabrielle N. Desrochers ◽  
Garett J. Morris ◽  
Chad D. Rumney ◽  
Sydney J. Sandell ◽  
...  
Keyword(s):  
Sex Differences ◽  
Ice Hockey ◽  
Peak Force ◽  
Segment Length ◽  
Emg Activity ◽  
Activation Patterns ◽  
Time To Peak ◽  
Upper Trapezius ◽  
Hockey Players ◽  
Dominant Side

The purpose of this study was to assess changes in cervical musculature throughout contact-heavy collegiate ice hockey practices during a regular season of NCAA Division III ice hockey teams. In this cross-sectional study, 36 (male n = 13; female n = 23) ice hockey players participated. Data were collected over 3 testing sessions (baseline; pre-practice; post-practice). Neck circumference, neck length, head-neck segment length, isometric strength and electromyography (EMG) activity for flexion and extension were assessed. Assessments were completed approximately 1h before a contact-heavy practice and 15 min after practice. For sternocleidomastoid (SCM) muscles, males had significantly greater peak force and greater time to peak force versus females. For both left and right SCMs, both sexes had significantly greater peak EMG activity pre-practice versus baseline, and right (dominant side) SCM time to peak EMG activity was decreased post-practice compared to pre-practice. There were no significant differences for EMG activity of the upper trapezius musculature, over time or between sexes. Sex differences observed in SCM force and activation patterns of the dominant side SCM may contribute to head stabilization during head impacts. Our study is the first investigation to report changes in cervical muscle strength in men’s and women’s ice hockey players in the practical setting.

scholarly journals Sex differences in white matter alterations following repetitive subconcussive head impacts in collegiate ice hockey players

2018 ◽  
Vol 17 ◽  
pp. 642-649 ◽  
Author(s):  
Nico Sollmann ◽  
Paul S. Echlin ◽  
Vivian Schultz ◽  
Petra V. Viher ◽  
Amanda E. Lyall ◽  
...  
Keyword(s):  
Sex Differences ◽  
White Matter ◽  
Ice Hockey ◽  
Head Impacts ◽  
Hockey Players

Electromyographic analysis of upper trapezius, abductor pollicis longus and abductor pollicis brevis during smartphone use in different positions among young male and female subjects

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Nida Irshad ◽  
Shahid Raza ◽  
Jamal Ali Moiz ◽  
Aqsa Mujaddadi ◽  
Pooja Bhati
Keyword(s):  
Muscle Activation ◽  
Young Male ◽  
Emg Activity ◽  
Abductor Pollicis Brevis ◽  
Activation Patterns ◽  
Male And Female ◽  
Abductor Pollicis Longus ◽  
Upper Trapezius ◽  
Smartphone Use ◽  
Female Subjects

Abstract Background Smartphone use has increased tremendously in recent times and there are various adverse musculoskeletal consequences associated with its use. Alteration in the activation patterns of muscles in certain positions may be the reason behind the development of musculoskeletal disorders in smartphone users; however, it has not been thoroughly investigated by the existing literature. Objectives To investigate the electromyographic (EMG) activity of upper trapezius (UT), abductor pollicis brevis (APB) and abductor pollicis longus (APL) during smartphone use in three different positions (standing, sitting on the chair and sitting cross legged on the floor) in young male versus female subjects. Methods Twenty-six young male (age: 23.77 ± 2.47 years) and 26 young female (age: 22.45 ± 2.32 years) smartphone users were recruited from Centre for Physiotherapy and Rehabilitation Sciences, Jamia Millia Islamia, New Delhi, India. EMG activity of UT, APB and APL muscles was examined using surface electrodes during a smartphone task in three different positions, i.e. standing, sitting on a chair, sitting cross-legged on the floor. The smartphone task consisted of typing English quotations for 20 s 3 times with a rest period of 10 s between each quotation and a 5-min interval between each position, respectively. Results EMG activity of the UT muscle was found to be significantly reduced when sitting on a chair as compared to standing (p < 0.001) and sitting cross-legged (p = 0.008) during smartphone use. APB and APL muscle activity were not significantly different between the three positions (p > 0.05). Moreover, the activation patterns of these muscles did not differ in male and female subjects (p > 0.05). Conclusion The present study demonstrates that the UT muscle is least activated when sitting on chair as compared to standing and sitting cross-legged during smartphone use. Moreover, the activity of neck and thumb muscles does not vary significantly between male and female subjects during smartphone use in different positions. As UT muscle activation significantly varies with the position of smartphone use, thus, the position adopted during smartphone use should be taken into consideration and the position which causes least strain on muscles, i.e. sitting on the chair should be adopted.

Measurement of the EMG-force relationship in a human upper airway muscle

1995 ◽  
Vol 79 (1) ◽  
pp. 270-278 ◽  
Author(s):  
D. Fuller ◽  
J. Sullivan ◽  
E. Essif ◽  
K. Personius ◽  
R. F. Fregosi
Keyword(s):  
Upper Airway ◽  
Incremental Exercise ◽  
Peak Force ◽  
Peak Exercise ◽  
Emg Activity ◽  
Time To Peak ◽  
Integrated Emg ◽  
Upper Airway Muscles ◽  
Relationship Of ◽  
Force Relationship

The upper airway muscles play an important role in breathing, swallowing, and speaking, but little is known about the electromyogram (EMG)-force relationship of these muscles. We have measured the peak integrated EMG activity (iEMG) and force of human nasal dilator muscles (NDM) with a custom-designed headpiece that was attached via the forehead and upper lip. The headpiece contains a micromanipulator that holds a rod with a load cell mounted on its tip. The reproducibility of the force measurements was examined by measuring the lateral or “flaring” force of the NDM in multiple trials on two separate occasions in 13 subjects. For these studies the subjects were instructed to perform maximal voluntary contractions (MVCs). Test-retest reproducibility averaged 8.3% (coefficient of variation) for within-day comparisons and 13.7% between days. We also measured iEMG and NDM force during an incremental exercise test in nine of the subjects; they were instructed to breathe nasally throughout one 30-s epoch at rest and at each workload. The iEMG and force during peak exercise (175–275 W) averaged 81 +/- 26% (SD) MVC and 235 +/- 127 mN (approximately 75% MVC), respectively. The iEMG during incremental exercise was linearly related to the peak force (r = 0.90, P < 0.001). Contractile properties were measured in seven of the subjects by application of single supramaximal shocks (0.1-ms pulse) to the facial nerve. Twitch force averaged 9 +/- 6% MVC, and the time to peak force was 62 +/- 13 ms, which is considerably faster than that in human diaphragm or elbow flexors.

Difference Between Male and Female Ice Hockey Players in Muscle Activity, Timing, and Head Kinematics During Sudden Head Perturbations

2018 ◽  
Vol 34 (6) ◽  
pp. 454-461
Author(s):  
Chadwick Debison-Larabie ◽  
Bernadette A. Murphy ◽  
Michael W.R. Holmes
Keyword(s):  
Sex Differences ◽  
Muscle Activity ◽  
Ice Hockey ◽  
Neck Muscle ◽  
Head Acceleration ◽  
Head Kinematics ◽  
Neuromuscular Response ◽  
Flexion Extension ◽  
Hockey Players ◽  
Splenius Capitis

This study examined sex differences in head kinematics and neck muscle activity during sudden head perturbations. Sixteen competitive ice hockey players participated. Three muscles were monitored bilaterally using surface electromyography: sternocleidomastoid, scalene, and splenius capitis. Head and thorax kinematics were measured. Head perturbations were induced by the release of a 1.5-kg weight attached to a wire wrapped around an adjustable pulley secured to the participant’s head. Perturbations were delivered in 4 directions (flexion, extension, right lateral bend, and left lateral bend). Muscle onset times, muscle activity, and head kinematics were examined during 3 time periods (2 preperturbation and 1 postperturbation). Females had significantly greater head acceleration during left lateral bend (31.4%, P < .05) and flexion (37.9%, P = .01). Females had faster muscle onset times during flexion (females = 51 ± 11 ms; males = 61 ± 10 ms; P = .001) and slower onset times during left lateral bend and extension. Females had greater left/right sternocleidomastoid and scalene activity during extension (P = .01), with no difference in head acceleration. No consistent neuromuscular strategy could explain all directional sex differences. Females had greater muscle activity postperturbation during extension, suggesting a neuromuscular response to counter sudden acceleration, possibly explaining the lack of head acceleration differences.

Myoelectric Activity Differences in Three Learning Sessions

2002 ◽  
Vol 16 (2) ◽  
pp. 92-96
Author(s):  
Tiina Ritvanen ◽  
Reijo Koskelo ◽  
Osmo H„nninen
Keyword(s):  
High School Students ◽  
Muscle Activity ◽  
Muscle Tension ◽  
Emg Activity ◽  
Traditional Learning ◽  
Myoelectric Activity ◽  
School Students ◽  
Language Laboratory ◽  
Upper Trapezius ◽  
Muscle Groups

Abstract This study follows muscle activity in three different learning sessions (computer, language laboratory, and normal classroom) while students were studying foreign languages. Myoelectric activity was measured in 21 high school students (10 girls, 11 boys, age range 17-20 years) by surface electromyography (sEMG) from the upper trapezius and frontalis muscles during three 45-min sessions. Root mean square (RMS) average from both investigated muscles was calculated. The EMG activity was highest in both muscle groups in the computer-aided session and lowest in the language laboratory. The girls had higher EMG activity in both investigated muscle groups in all three learning situations. The measured blood pressure was highest at the beginning of the sessions, decreased within 10 min, but increased again toward the end of the sessions. Our results indicate that the use of a computer as a teaching-aid evokes more constant muscle activity than the traditional learning situations. Since muscle tension can have adverse health consequences, more research is needed to determine optimal classroom conditions, especially when technical aids are used in teaching.

scholarly journals Knowledge and attitudes towards concussion in UK-based male ice hockey players: A need for attitude change?

2019 ◽  
Vol 14 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Sarah Hutchinson ◽  
Paul Ellison ◽  
Andrew Levy ◽  
David Marchant
Keyword(s):  
Attitude Change ◽  
Ice Hockey ◽  
Knowledge And Attitudes ◽  
Accurate Knowledge ◽  
Hockey Players ◽  
Sport Concussion ◽  
Concussion History ◽  
Concussion Knowledge ◽  
The Uk

Objective Concussion is a common injury in ice hockey, and previous research suggests some misconceptions and unsafe attitudes amongst players. The purpose of this study was to assess sport concussion knowledge, attitudes and the effect of sport concussion history in UK-based male ice hockey players across three levels of competition: professional, semi-professional and amateur. Methods Sixty-one participants across a number of UK ice hockey teams completed the Rosenbaum Concussion Knowledge and Attitudes Survey and reviewed a series of statements to assess knowledge (concussion knowledge index), attitudes (concussion attitude index) and misconceptions of concussion. Results Level of competition and concussion history had no significant effect on concussion knowledge index or concussion attitude index. A positive significant relationship exists between playing experience and concussion knowledge index and concussion attitude index. Statements identified common misconceptions and areas of accurate knowledge regarding concussion symptoms suggesting that male ice hockey players have a higher level knowledge compared to a sample of the UK general public. Playing experience was associated with increased knowledge and increasingly safe attitudes towards concussion. Conclusion Despite knowledge relating to loss of consciousness and correct management of symptoms being generally accurate, there are worryingly unsafe attitudes regarding aspects of concussion. Such attitudes may well pose significant threats to players’ safety and long-term health.

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