scholarly journals A method for designing the longitudinal position of a porthole in a manned submersible based on the back muscle fatigue characteristics

2021 ◽  
Author(s):  
Mengya Zhu ◽  
Dengkai Chen ◽  
Yu Fan ◽  
Jiayan Guo
Keyword(s):  
Muscle Fatigue ◽  
Back Muscle ◽  
Manned Submersible ◽  
Fatigue Characteristics ◽  
Longitudinal Position

scholarly journals Age- and sex-specific effects in paravertebral surface electromyographic back extensor muscle fatigue in chronic low back pain

GeroScience ◽  
2019 ◽  
Vol 42 (1) ◽  
pp. 251-269 ◽  
Author(s):  
Gerold Ebenbichler ◽  
Richard Habenicht ◽  
Sara Ziegelbecker ◽  
Josef Kollmitzer ◽  
Patrick Mair ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Muscle Fatigue ◽  
Chronic Low Back Pain ◽  
Median Frequency ◽  
Low Back ◽  
Back Muscle ◽  
The Impact ◽  
Back Extensor ◽  
Age And Sex

AbstractThe impact of aging on the back muscles is not well understood, yet may hold clues to both normal aging and chronic low back pain (cLBP). This study sought to investigate whether the median frequency (MF) surface electromyographic (SEMG) back muscle fatigue method—a proxy for glycolytic muscle metabolism—would be able to detect age- and sex-specific differences in neuromuscular and muscle metabolic functions in individuals with cLBP in a reliable way, and whether it would be as sensitive as when used on healthy individuals. With participants seated on a dynamometer (20° trunk anteflexion), paraspinal SEMG activity was recorded bilaterally from the multifidus (L5), longissimus (L2), and iliolumbalis (L1) muscles during isometric, sustained back extensions loaded at 80% of maximum from 117 younger (58 females) and 112 older (56 female) cLBP individuals. Tests were repeated after 1–2 days and 6 weeks. Median frequency, the SEMG variable indicating neuromuscular fatigue, was analyzed. Maximum back extensor strength was comparable between younger and older participants. Significantly less MF-SEMG back muscle fatigue was observed in older as compared to younger, and in older female as compared to older male cLBP individuals. Relative reliability was excellent, but absolute reliability appeared large for this SEMG-fatigue measure. Findings suggest that cLBP likely does not mask the age-specific diagnostic potential of the MF-SEMG back extensor fatigue method. Thus, this method possesses a great potential to be further developed into a valuable biomarker capable of detecting back muscle function at risk of sarcopenia at very early stages.

scholarly journals Assessment of Postural effect on Work Related Musculoskeletal Disorders and Back Muscle Fatigue among the Goldsmiths of India

2017 ◽  
Vol 5 (2) ◽  
pp. 16-22
Author(s):  
Tirthankar Ghosh
Keyword(s):  
Muscle Fatigue ◽  
Musculoskeletal Disorders ◽  
Trunk Muscles ◽  
Questionnaire Study ◽  
Physical Work ◽  
Low Back ◽  
Back Muscle ◽  
Work Related ◽  
Work Related Musculoskeletal Disorders ◽  
Postural Effect

Background: Musculoskeletal disorders (MSD) may be defined as injuries and disorders of the muscles, nerves, tendons, ligaments, joints, cartilage and spinal disc. This may occur due to improper physical work activities or appalling workplace conditions. Awkward or extreme postures are less efficient than posture keep joints near the center of their range of motion.Objective: The objective of the current study was to assessment of postural effect on work related musculoskeletal disorders and back muscle fatigue among the goldsmiths of India.Methods: In this current study, the experiment was performed on 100 male goldsmiths. A detailed questionnaire study on discomfort feeling was done and analysis of body posture by Rapid Upper Limb Assessment was done to evaluate the work stress during their job. Electromyographic activity was collected from ten major trunk muscles sites which consist of right and left muscle.Result: From the analysis, it was revealed that musculoskeletal disorders were the major problem of the goldsmiths. Moreover questionnaire study revealed that most of the workers were affected by pain at Neck (80%), Low back (91%), Wrist (45%), Shoulder (20%). Decreased in RMS and MedF of all the ten major trunk muscles were observed at the end of the every work cycle, which indicating that muscular fatigue was induced by the Gold Smiths tasks.Conclusion: From this study it can be concluded that the goldsmiths are working in awkward and forward bending postures for prolonged period of time with the potential risks of musculoskeletal disorders primarily affecting the low-back and neck region of the body. This can be attributed by the improper design of the workstation.

Effects of chair design on back muscle fatigue

1995 ◽  
Vol 5 (2) ◽  
pp. 101-113 ◽  
Author(s):  
Jeffrey R. Cram ◽  
Itamar Vinitzky
Keyword(s):  
Muscle Fatigue ◽  
Back Muscle ◽  
Chair Design

Can HDEMG-Based Low Back Muscle Fatigue Estimates Be Used in Exoskeleton Control During Prolonged Trunk Bending? A Pilot Study

2021 ◽  
pp. 183-187
Author(s):  
Niels P. Brouwer ◽  
Ali Tabasi ◽  
Alejandro Moya-Esteban ◽  
Massimo Sartori ◽  
Wietse van Dijk ◽  
...  
Keyword(s):  
Pilot Study ◽  
Muscle Fatigue ◽  
Low Back ◽  
Back Muscle

Force Myography analysis of muscle fatigue characteristics during hand motion

2018 ◽  
Vol 2018.29 (0) ◽  
pp. 1B25
Author(s):  
Tatsuya IGARASHI ◽  
Kazuhiro FUJISAKI ◽  
Kazuhiko SASAGAWA ◽  
Takeshi MORIWAKI
Keyword(s):  
Muscle Fatigue ◽  
Hand Motion ◽  
Force Myography ◽  
Fatigue Characteristics

Back muscle fatigue of younger and older adults with and without chronic low back pain using two protocols: A case-control study

2015 ◽  
Vol 25 (6) ◽  
pp. 928-936 ◽  
Author(s):  
Rubens A. da Silva ◽  
Edgar R. Vieira ◽  
Marcos Cabrera ◽  
Leandro R. Altimari ◽  
Andreo F. Aguiar ◽  
...  
Keyword(s):  
Older Adults ◽  
Low Back Pain ◽  
Back Pain ◽  
Muscle Fatigue ◽  
Chronic Low Back Pain ◽  
Case Control Study ◽  
Case Control ◽  
Low Back ◽  
Back Muscle ◽  
Control Study

Effects of mechanical bed massage on biochemical markers of exercise-induced back muscle fatigue in athletes: A randomized controlled trial

2020 ◽  
Vol 33 (5) ◽  
pp. 793-800
Author(s):  
Houyong Zhong ◽  
Wichai Eungpinichpong ◽  
Xingze Wang ◽  
Uraiwan Chatchawan ◽  
Sawitri Wanpen ◽  
...  
Keyword(s):  
Creatine Kinase ◽  
Muscle Fatigue ◽  
Controlled Trial ◽  
Collegiate Athletes ◽  
Serum Cortisol ◽  
Control Group ◽  
Back Muscle ◽  
Significant Difference ◽  
Exercise Induced ◽  
Experimental Group

BACKGROUND: Many previous studies have explored the effects of manual massage on back muscle fatigue, and most of the mechanical massage techniques imitate manual massage. However, it is unknown whether mechanical and manual massage have the same functions for exercise-induced back muscle fatigue. OBJECTIVE: To investigate the effects of mechanical bed massage on the biochemical markers of exercise-induced back muscle fatigue in male collegiate athletes. METHODS: Twenty-eight male collegiate athletes who met the experimental criteria were recruited in this randomized controlled trial, and randomly assigned to a mechanical bed massage group (experimental group) or resting group (control group). The subjects performed eight bouts of reverse sit-up in the prone position and received 20 minutes of the intervention. Creatine kinase, blood lactate, and serum cortisol levels were measured at baseline, after fatigue, after intervention, and after 24 hours. RESULTS: The level of serum cortisol of the control group was significantly higher than that of the experimental group after the intervention (p< 0.05). The comparison of the two groups for blood lactate levels showed no significant differences at any of the measurement time-points (p> 0.05). There was no significant difference in creatine kinase levels immediately after the intervention (p> 0.05), but a significant difference in creatine kinase level was observed between the two groups 24 hours later (p< 0.05). CONCLUSIONS: Significant differences were observed between mechanical bed massage and rest condition on serum cortisol and creatine kinase for exercise-induced muscle fatigue. Therefore, mechanical bed massage may reduce stress and muscle damage for the athlete after training or competition.

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