Localized muscle fatigue: review of three experiments (original) (raw)
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Measurement of human muscle fatigue
Human muscle fatigue has been studied using a wide variety of exercise models, protocols and assessment methods. Based on the definition of fatigue as 'any reduction in the maximal capacity to generate force or power output', the different methods to measure fatigue are discussed. It is argued that reliable and valid measures must include either assessment of maximal voluntary contraction force or power, or the force generated by electrical stimulation. By comparing tetanic stimulation and maximal voluntary contraction force one may reveal whether fatigue is of central origin, or whether peripheral mechanisms are involved. Adequate use of twitch interpolation provides an even more sensitive measure for central fatigue. Indirect methods as endurance times and electromyography show variable responses during exercise and no close relationship to fatigue. Hence these methods are of limited value in measurement of human muscle fatigue. © 1997 Elsevier Science B.V.
Quantitative subjective assessment of fatigue in static muscle effort
European Journal of Applied Physiology and Occupational Physiology, 1973
The possibility of subjective assessment of fatigue in a static muscle load has been demonstrated. Six subjects performed a static muscle exercise with 25, 35 and 45 % of their voluntary maximum force. They quantified their subjective feeling of fatigue by means of an assessment scale. The method of fatigue assessment used in these experiments appears to be very reliable and the discriminatory power is great. Differences in assessment of fatigue between the three imposed loads were already significant after 1 min in the working period; they became more significant during this period. They differed also in the first minute of recovery. This method of fatigue assessment has a greater discriminatory power than recording of heart rate.
2019
Background. Simultaneous tiredness of two or more muscles around a joint can be defined as coordinated fatigue (co-fatigue) and might occur between agonist and antagonist muscles, and vary according to the level of sporting activity levels or gender. Objectives. The aim of this study was to determine the levels of coordinated fatigue in agonist and antagonist muscles during squat-press exercise. Methods. Twenty athletes and twenty sedentary subjects participated in the study. Surface electromyography signals of the rectus femoris, vastus lateralis obliquus, biceps femoris and semitendinosus muscles were recorded at the squat press position for 15 seconds during isometric contraction. Measurements were repeated five times and a 2-minute rest period was allowed between repetitions. After erroneous EMG elimination, movement artefacts were removed by using a 20 Hz high-pass Butterworth filter. Then, as a well-recognized fatigue index, the median frequency (MF) of each filtered middle part of the EMG signal (5 to 10 s. of contraction) was calculated, given that it is known that the MF decreases during isometric contractions. Finally, each MF-based co-fatigue index was calculated by dividing the mean RF and VLO median frequencies by the mean ST and BF median frequencies. The cumulative co-fatigue values of "male vs. female" and "sedentary vs. athlete" comparisons were performed by using a two-sided Student t-test with a Bonferroni correction. Results. There was a statistically significant (Bonferroni corrected p-value < 0.05) difference between the mean female (1.57 0.53) and the mean male (1.23 0.17) co-fatigue values, while there was no statistically significant difference between the mean co-fatigue values of sedentary (1.51 0.52) and athlete (1.29 0.27) subjects. Conclusion. The offered co-fatigue indices might be useful for other sports, physiotherapy and related areas if sufficient scientific proof is accumulated.
A global view on how local muscular fatigue affects human performance
Proceedings of the National Academy of Sciences, 2020
Significance The human body is an organism with interdependent systems, where phenomena or interventions in a specific region can provoke responses in another apparently unrelated one. Localized muscle fatigue is characterized as a failure in the production of strength in a specific region caused by overuse. To investigate the global effect of this failure, access to interactions between different regions and systems is needed. In this work, we propose a global multivariate model based on artificial neural networks that produces as output a general functional profile, built from information from different control systems, which allows us to access the effects of local muscle fatigue on tasks that imply body performance as a single system.
The Duration of Non-Local Muscle Fatigue Effects
Journal of sports science and medicine, 2024
Non-local muscle fatigue (NLMF) refers to a transient decline in the functioning of a non-exercised muscle following the fatigue of a different muscle group. Most studies examining NLMF conducted post-tests immediately after the fatiguing protocols, leaving the duration of these effects uncertain. The aim of this study was to investigate the duration of NLMF (1-, 3-, and 5minutes). In this randomized crossover study, 17 recreationally trained participants (four females) were tested for the acute effects of unilateral knee extensor (KE) muscle fatigue on the contralateral homologous muscle strength, and activation. Each of the four sessions included testing at either 1-, 3-, or 5-minutes post-test, as well as a control condition for non-dominant KE peak force, instantaneous strength (force produced within the first 100ms), and vastus lateralis and biceps femoris electromyography (EMG). The dominant KE fatigue intervention protocol involved two sets of 100-seconds maximal voluntary isometric contractions (MVIC) separated by 1-minute of rest. Nondominant KE MVIC forces showed moderate and small magnitude reductions at 1-min (p < 0.0001, d = 0.72) and 3-min (p = 0.005, d = 0.30) post-test respectively. The KE MVIC instantaneous strength revealed large magnitude, significant reductions between 1-min (p = 0.021, d = 1.33), and 3-min (p = 0.041, d = 1.13) compared with the control. In addition, EMG data revealed large magnitude increases with the 1-minute versus control condition (p = 0.03, d = 1.10). In summary, impairments of the non-exercised leg were apparent up to 3-minutes postexercise with no significant deficits at 5-minutes. Recovery duration plays a crucial role in the manifestation of NLMF.
Non-local muscle fatigue: effects and possible mechanisms
European journal of applied physiology, 2015
Non-local muscle fatigue (NLMF) is characterized by muscle performance impairments in a contralateral or remote non-exercised muscle(s) following a fatiguing protocol of a different muscle group(s). This topic is of interest as it affords insights into physiological determinants of muscle fatigue and may provide practical applications concerning the order of exercises in training and rehabilitation programs. A literature review was conducted using Web of Science, PubMed, and Google Scholar databases to evaluate the NLMF effects and possible underlying mechanisms. Overall, 35 studies with 58 outcome measures that met the inclusion criteria were identified. The literature is conflicting with approximately half of the studies reporting NLMF effects (32 of 58 measurements). However, on closer examination 76% of outcome measures of the lower limbs reported NLMF effects (23 of 30 measurements) compared to only 32% in the upper body (9 of 28 measurements). Thus, it appears that NLMF effect...
Framework for dynamic evaluation of muscle fatigue in manual handling work
2008
Muscle fatigue is defined as the point at which the muscle is no longer able to sustain the required force or work output level. The overexertion of muscle force and muscle fatigue can induce acute pain and chronic pain in human body. When muscle fatigue is accumulated, the functional disability can be resulted as musculoskeletal disorders (MSD). There are several posture exposure analysis methods useful for rating the MSD risks, but they are mainly based on static postures. Even in some fatigue evaluation methods, muscle fatigue
Quantitative and non-invasive measurement of exercise-induced fatigue
Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, 2018
Prolonged exercise-induced muscular fatigue adversely affects physical performance. The fatigue increases the risk of sport injuries, whereas early fatigue detection and assessment can prevent injuries. An assessment of the most crucial impacts of fatigue on physical performance leads to the development of an accurate, non-invasive and objective muscular fatigue measurement method. The most common manifestation of exercise-induced fatigue is a significant decline in force produced by the muscles that in turn affects motion characteristics. This directly alters body postural behaviour and decreases the amount of kinetic energy produced by the subject. The current non-invasive and objective methods to measure fatigue and analyse motion characteristics cannot provide a comprehensive information about muscular fatigue because of their limited ability to record different aspects of motion. An objective and non-invasive assessment method of exercise-induced fatigue, in which the variation...