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Biochemistry of Buffering Capacity and Ingestion of Buffers In Exercise and Athletic Performance
Published in Peter M. Tiidus, Rebecca E. K. MacPherson, Paul J. LeBlanc, Andrea R. Josse, The Routledge Handbook on Biochemistry of Exercise, 2020
Bryan Saunders, Guilherme G. Artioli, Eimear Dolan, Rebecca L. Jones, Joseph Matthews, Craig Sale
Muscle fatigue is the loss in force or power production in response to muscle contraction (61). During exercise, this results in the inability to sustain exercise at a given intensity. It is widely accepted that exercise-induced muscle fatigue is a complex, multifactorial phenomenon caused by several mechanisms that can vary according to exercise type, intensity, and duration. Both central (i.e., arising in the central nervous system) and peripheral (i.e., arising in skeletal muscle or the neuromuscular junction) events have been implicated in fatigue development (61).
Skeletal Muscle
Published in Nassir H. Sabah, Neuromuscular Fundamentals, 2020
Muscle fatigue refers to the decline in muscle performance with continued activity, as evidenced, for example, by reduced force, decreased shortening velocity, and a slower rate of relaxation. Recovery from fatigue requires a period of rest that depends on the type of muscle and on the duration and intensity of the activity. ATP concentration only slightly decreases in muscle fatigue. Otherwise, the cross bridges will remain in a locked state, which can be very damaging to muscle fibers.
Peripheral muscles
Published in Claudio F. Donner, Nicolino Ambrosino, Roger S. Goldstein, Pulmonary Rehabilitation, 2020
Luis Puente-Maestu, François Maltais, André Nyberg, Didier Saey
Monitoring surface electromyography (EMG) while performing dynamic or static measurements is an alternative method to quantify muscle fatigue in patients with COPD (32,34). However, the feasibility and clinical applicability of EMG measurements of muscle fatigue can be questioned since the equipment requires special knowledge and the procedure is more time consuming than standard methods. It is also uncertain if EMG provides additional information in comparison to the previously-described static and dynamic test procedures (64).
Prevalence of musculoskeletal disorders in anesthesiologists in Ismailia Governorate
Published in Egyptian Journal of Anaesthesia, 2023
Eslam Albayadi, Abelrahman Soliman, Wesam F. Alyeddin
Risk factors for the development of musculoskeletal disorders included the need for excessive bending and twisting, poor work ergonomics that needs improvement, poorly optimized patient position before specific procedures, and prolonged working hours per week. This was emphasized by a previous study reporting repeated maneuvers and long forceful positions as work-related risk factors for developing WRMSDs [16]. An earlier study reported that work ergonomics were suboptimal by 69.1% of the participants [14]. It has been reported that working in the outpatient clinic for>16 hours/week was associated with increased head and neck pain [17]. This would be explained by prolonged working hours acting as a cause of muscle fatigue and exhaustion without enough time to recover [18]. The body must maintain a neutral position at work. Awkward positions and sustained static postures cause strain on the musculoskeletal system and body fatigue [19]. Accordingly, ergonomics education during medical training was recommended to change physicians’ behavior and reduce the developing symptoms [6].
Investigating the impacts of working at home among office workers with neck pain on health status, depression and sleep quality during the COVID-19 pandemic
Published in International Journal of Occupational Safety and Ergonomics, 2023
Another notable factor for occurrence of neck pain is the prolonged period of working with a computer. Plenty of studies have shown that the prolonged period of working posture with computers was an important risk factor for progression of chronic neck pain [33]. The prolonged working position of the workers can increase the load on the muscles and negatively affect the blood flow. This can cause muscle fatigue. The present study found that the duration of working with a computer without a break is an influencing factor for neck pain intensity in home office workers. The participants who work on a computer >3 h without a break had high NPDI scores. However, there was no similar relationship in the office worker group. Another study suggested the relationship between computer usage time and neck pain. Spending a typical 40-h working week or longer sitting in front of a computer screen doubled the risk of neck problems in women [30]. Plenty of studies have shown that an active break has a positive effect on prevention of musculoskeletal pain and reduction of pain intensity. Also, exercises – especially stand and walking exercises – are suggested for office workers. Sitthipornvorakul et al. [34] presented that the 6-month incidence rate of neck pain among high-risk healthy office workers may be decreased with a walking intervention. Another study by Danquah et al. [35] found that the prevalence of neck pain after a 30-month Take a Stand! intervention for reducing sitting time was decreased.
Effects of back extensor and hip abductor fatigue on dynamic postural stability in patients with nonspecific chronic low back pain: A case-control study
Published in Physiotherapy Theory and Practice, 2022
Shirin Tajali, Narges Roozbehfar, Mohammad Mehravar, Shahin Goharpey, Khadije Gayem
Muscle fatigue, defined as a reduction in the force output of a skeletal muscle, can happen during different submaximal daily activities (Johanson et al., 2011; Parreira et al., 2013). It is known that postural control can be negatively affected by peripheral muscle fatigue due to decreased muscle contractile efficiency and proprioceptive acuity (Gribble and Hertel, 2004a, 2004b; Parreira et al., 2013). Indeed, disruption in the afferent feedbacks due to muscle fatigue may impair joint proprioception and subsequently affects somatosensory inputs and postural control strategies (Gribble and Hertel, 2004a, 2004b). In patients with chronic LBP, reduced lumbosacral proprioception and poor lumbar extensor endurance have been frequently reported in the literature (Brumagne, Cordo, and Verschueren, 2004; Da Silva et al., 2015). Importantly, decreased back muscle endurance was associated with increased periods of sitting and lower physical activity levels in chronic LBPs who reported pain during sustained postures in their work (O’Sullivan et al., 2006). Although it is well understood that back muscles are extremely important for preserving postural stability during daily activities (Da Silva et al., 2015, 2016; Parreira et al., 2013), little is known about their fatigue effects on postural stability in patients with NSCLBP.