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https://www.selleckchem.com/products/PD-0332991.html The aim of this study was to assess the validity of a custom-made low cost (LC) and a commercial surface EMG apparatus in controlled experimental conditions and different exercise types maximal voluntary contractions (MVC) at 105, 90, 75, 60, 45 and 30° knee angle and explosive fix-end contractions of the knee extensors (75°) at an isometric dynamometer. sEMG of vastus lateralis was recorded from the same electrodes simultaneously, then analyzed in the same way; sEMG were finally expressed in percentage of those collected at 75°MVC. LC underestimated the sEMG signal at the more extended knee angles (30-60°), significant difference was observed only at 30°. In the explosive contractions no differences between devices were observed in average and peak sEMG, as well as in the time to peak and the activation time. Bland-Altman tests and correlation parameters indicate the LC device is not sensible enough to detect the time to peak and the peak values of the sEMG signal properly. Results suggest low-cost systems might be a valid alternative to commercial ones, but attention must be paid when analyzing rapid events.ACAN variants can manifest as various clinical features, including short stature, advanced bone age (BA), and skeletal defects. Here, we report rare clinical manifestations of ACAN defects in a 9 year, 5 month-old girl born small for gestational age (SGA), presented with short stature, and was initially diagnosed with idiopathic growth hormone deficiency. She displayed several dysmorphic features including genu valgum, cubitus valgus, and recurrent patellar dislocations. She presented with progressive advancement of BA compared to that for chronological age and whole exome sequencing confirmed the presence of a novel heterozygous nonsense variant c.1968C>G, p.(Tyr656*) of ACAN. ACAN variants should be considered in short stature patients born SGA with joint problems, particularly those with recurrent patellar

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