Effects of the Sling Neurac Method on the EMG Activity of the Trunk and Hamstring Muscles during the Bridge Exercise

2021 ◽  
Vol 1 (1) ◽  
pp. 25-33
Author(s):  
Yong-Mok Ha ◽  
Jae-Seop Oh ◽  
Duk-Hyun An ◽  
Mi-Hyun Kim
Keyword(s):  
Emg Activity ◽  
Hamstring Muscles

Comparison of Electromyographic Activity During Hip Extension Exercises Under Gravitational or Inertial Loading Conditions

2021 ◽  
pp. 194173812110114
Author(s):  
Rodrigo Martín-San Agustín ◽  
Lorenzo Castillo-Ballesta ◽  
Javier Llobat Sancho ◽  
Rubén Esbri-Navarro ◽  
Mariana Sánchez-Barbadora
Keyword(s):  
Training Programs ◽  
Hamstring Injury ◽  
Emg Activity ◽  
Electromyographic Activity ◽  
Loading Conditions ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Hamstring Muscles ◽  
Inertial Loading ◽  
Hip Extension

Background: Hamstring injury prevention programs include strengthening, especially eccentric exercises using both gravitational and inertial loading. Inertial exercises are characterized by eccentric contractions of high intensity and velocity. This study aimed to analyze the muscular activation of the biceps femoris (BF), semitendinosus (ST), gluteus maximus (GM), and gracilis (GC) muscles during hip extension (HE) exercises performed under both gravitational and inertial loading conditions. Hypothesis: Inertial training would generate a greater activation of HE muscles than gravitational training. Study Design: Cross-sectional study. Level of Evidence: Level 4. Methods: Fifteen resistance-trained men performed the unilateral straight knee bridge (SKB), 45° of HE, and stiff-leg deadlift (SDL) exercises under gravitational and inertial loading conditions. Concentric and eccentric phases were identified with a linear encoder. Differences between load types, exercises, and their interaction were examined to establish the electromyographic (EMG) activity of each muscle and BF/ST ratio. Results: In the concentric phase, inertial loading showed a higher normalized EMG than gravitational loading for BF, ST, and GM. SKB and HE activated BF and ST between 9.6% and 24.3% more than SDL. In the eccentric phase, the inertial modality achieved greater GM activation than the gravitational form (18.1%). BF activation was increased with HE and SKB as compared with SDL (24.4% and 16.4%, respectively), while ST activation was likewise enhanced with HE as compared with SDL (15.1%). Conclusion: Inertial training is more effective than gravitational training for the concentric activation of the hamstring muscles while SDL showed lower hamstring activation than HE and SKB. Therefore, HE and SKB with inertial loading should be taken into account in hamstring training programs. Clinical Relevance: Inertial training is more effective than gravitational training for the concentric activation of the hamstring muscles. HE and SKB with inertial loading should be taken into account in hamstring training programs.

Effects of hip rotation on the electromyographic activity of the medial and lateral hamstrings and muscle force

2021 ◽  
pp. 1-7
Author(s):  
Wootaek Lim
Keyword(s):  
Prone Position ◽  
Supine Position ◽  
Knee Flexion ◽  
External Rotation ◽  
Emg Activity ◽  
Electromyographic Activity ◽  
Hamstring Muscles ◽  
Extension Force ◽  
Hip Rotation ◽  
Hip Extension

BACKGROUND: In clinical practice, knee flexion at the prone position for manual muscle testing of hamstrings and hip extension at the supine position for stretching of hamstring muscles are typically proposed. OBJECTIVE: Although different positions have been proposed for different purposes in hamstrings, the understanding of the changing the functional role of hamstrings with position changes is poorly understood. METHODS: The electromyographic (EMG) activity and hip extension force were compared among different postures; hip neutral, internal, and external rotation. EMG and force were measured in prone position during knee flexion and those were additionally measured in supine position during hip extension. In supine position, additional measurements were made in hip neutral, internal and external rotation. RESULTS: Hamstrings showed high EMG activity during knee flexion. Knee flexion force in prone position was significantly decreased at hip extension force in supine position. In supine position, EMG activity was significantly higher in semitendinosus (ST) than biceps femoris (BF) during internal rotation. CONCLUSIONS: It should be noted that bi-articular muscles may have different functional dependencies on the corresponding muscles for each joint. In addition, because the altered alignment of the hamstring muscles that was affected by hip rotation had a significant effect on muscle activity, and hip rotation may be helpful for selective training of medial or lateral hamstrings.

scholarly journals The task dependent differences in electromyography activity of hamstring muscles during leg curls and hip extensions

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0245838
Author(s):  
Norikazu Hirose ◽  
Yoshinori Kagaya ◽  
Masaaki Tsuruike
Keyword(s):  
Biceps Femoris ◽  
Distal Region ◽  
Voluntary Contraction ◽  
Proximal Region ◽  
Task Type ◽  
Emg Activity ◽  
Hamstring Muscles ◽  
Long Head ◽  
Hip Extension ◽  
Biceps Femoris Long Head

This study aimed to investigate the influence of the task type on the relative electromyography (EMG) activity of biceps femoris long head (BFlh) to semitendinosus (ST) muscles, and of proximal to distal regions during isometric leg-curl (LC) and hip-extension (HE). Twenty male volunteers performed isometric LC with the knee flexed to 30° (LC30) and 90° (LC90), as well as isometric HE with the knee extended (HE0) and flexed to 90° (HE90), at 40% and 100% maximal voluntary contraction (MVIC). Hip position was neutral in all conditions. EMG activity was recorded from the proximal and distal region of the BFlh and ST muscles. BFlh/ST was calculated from the raw root-mean-square (RMS) amplitudes. The RMS of 40% MVIC was normalized using MVIC data and the proximal/distal (P/D) ratio of normalized EMG (NEMG) was calculated. The BFlh/ST ratio was higher in HE0 than in LC90 during MVIC and 40% MVIC (p<0.05), and was higher in HE90 than in LC90 (p<0.05) during 40% MVIC at the proximal region, whereas no difference was observed between HE0 and LC30. There was no inter-task difference in BFlh/ST ratio in the distal region. Furthermore, the P/D ratio was higher in LC90 than in LC30 and HE0 (p<0.05) in BFlh and ST muscles, and was higher in HE90 than in LC30 and HE0 (p<0.05) in BFlh during 40% MVIC. However, there was no difference in P/D ratio between LC30 and LC90, and HE0 and HE90. This showed that there was no task-dependent difference in the EMG activity of the BFlh muscle relative to the ST muscle between prone hip extension and prone knee flexion when the knee joint was set at an equivalent angle. Similarly, there was no task-dependent difference in the NEMG of the proximal region relative to the distal region in BFlh and ST muscles during 40% MVIC.

Passive resistance of hamstring muscles in children with severe multiple disabilities?

2000 ◽  
Vol 42 (8) ◽  
pp. 541-544 ◽  
Author(s):  
S Holt ◽  
S Baagøe ◽  
F Lillelund ◽  
S P Magnusson
Keyword(s):  
Multiple Disabilities ◽  
Passive Resistance ◽  
Hamstring Muscles

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.

Estimation of EMG activity of trunk muscles in manual lifting tasks based on trunk dynamics using the fuzzy relational rule network

2003 ◽  
Author(s):  
Waldemar Karwowski ◽  
Adam Gaweda ◽  
William S. Marras ◽  
Kermit Davis ◽  
Jacek Zurada
Keyword(s):  
Trunk Muscles ◽  
Emg Activity ◽  
Manual Lifting

EMG-ACTIVITY OF MUSCLES OF THE CRANIO-MANDIBULAR SYSTEM DURING FUNCTIONS OF THE DENTO-FACIAL REGION

2020 ◽  
Vol 16 (71) ◽  
pp. 128
Author(s):  
L. V. Smaglyuk ◽  
V. I. Smaglyuk ◽  
А. V. Liakhovska ◽  
M. V. Trofymenko
Keyword(s):  
Emg Activity ◽  
Facial Region
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