Muscular work must be supported by a ready supply of ATP energy. There are three major ATPases that require ATP for muscle activity: Na+/K+-ATPase, myosin ATPase and Ca2+ ATPase. The Na+/K+-ATPase pumps Na+ back out and K+ back into the fiber after an action potential. The myosin...
special nature is reduced if they work under such conditions for at least thirty hours per week. daccess-ods.un.org 从事地下工作、对健康构成危害的工作或特殊性质的工作的雇员,如 果在此类条件工作了至少每周三十个小时,工作时间 要 缩短。 daccess-ods.un.org [...] mind: sleeping problems; ...
He also advised people to stay hydrated, saying the benefits of drinking water include helping one to lose weight, prevent kidney diseases and to increase stamina by fighting muscle fatigue. Galeragwe said stamina was necessary both at the workplace and at home to keep one focused, energised, ...
The failure time due to fatigue can be reduced by increasing the temperature, the magnitude of the stress, or frequency of the stress. Thus any one of these three factors can be used to accelerate a fatigue test. Caution must be used however to not change the type of failure, that is,...
Sleep disturbances can be characterized by multiple symptoms, such as increased sleep onset latency, impaired non-REM sleep, interrupted sleep, and awakening too early in the morning. Indeed, Alfini and colleagues [26] examined the between-person association between objectively measured sleep duration...
Brittle test series are insensitive to this behavior and stresses may be measured before or after machining. To enable comparability, it is crucial to perform the analysis at the same radial position for both, machined and as built conditions - either by electrolytic polishing, commonly considered ...
To examine the percentage of women by group who were no longer clinically fatigued at weeks 6 and 10, a Pearson χ2 test was conducted. The LMMs were also used to analyze the global PSQI and the LTQL subscales. For fatigue analyses, multiple testing (change in BFI score and BFI ...
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LCF is controlled by the ductility and HCF by the strength of the material, and thus, cold-work and radiation hardening (both of which result in reduced ductility) result in decreased fatigue life in the LCF range while being beneficial in the HCF range, especially at low stresses/strains. ...
Fatigue failure can be characterized by three stages: crack initiation (nucleation), crack propagation, and final fracture. Cracks tend to initiate at grain boundaries, inclusions, pores and other microstructural defects. In this stage, cracks typically propagate along maximum shear stress planes and ...