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OBJECTIVE: Masks are one of the most important defenses against the virus. However, the impact of wearing masks during daily activities or sports on respiratory and circulatory function remains controversial. A comprehensive quantitative evaluation of the effects of mask-wearing on human heart rate, oxygen saturation and end-expiratory carbon dioxide by Meta-analysis was conducted. The effects of wearing different types of masks at different exercise intensities and time of exercise on the human respiratory and circulatory system were explored. METHODS: By February 2023, with “mask, face mask, N95, training, sports, running, walking, cycling” as the Chinese search terms and “masks, respiratory protective devices, N95 respirators, surgical face masks, exercise, resistance training, explosive training, muscle exercises” as English search terms, the experimental studies addressing the influence of exercise with a mask on hemodynamic indexes were retrieved from CNKI, Web of Science, PubMed, Cochrane Library and WanFang databases. The outcome indicators included three continuous variables - exercise center rate, blood oxygen saturation and end-expiratory carbon dioxide. Stata16.0 software was used to analyze the outcome indicators of the included literature. The PEDro scale was used as a quality assessment tool, and the funnel plot was used to analyze the impact of publication bias. RESULTS: Totally 25 articles involving 857 healthy children and adults were included in this Meta-analysis. The overall methodological quality was high, with 22 studies scoring 6 points on the PEDro scale, 2 studies scoring 7 points and 1 study scoring 8 points. The meta-analysis results showed that compared with the control group, exercise with masks had no significant effect on heart rate (SMD=0.02, 95%CI: -0.11 to 0.15, P=0.81), but increased end-expiratory carbon dioxide (SMD=0.60, 95%CI: 0.37 to 0.83, P=0.00), decreased oxygen saturation (SMD=-0.28, 95%CI: -0.47 to -0.09, P=0.03). Intensity and duration were the factors that affected the heterogeneity between studies. Wearing a mask during high-intensity exercise significantly increased heart rate (SMD=-0.20, 95%CI: -0.36 to -0.04, P=0.02). The effect of high-intensity and short-time exercise on blood oxygen saturation was significantly higher than that of other exercises (SMD=-0.40, 95%CI: -0.70 to -0.10; SMD=-0.25, 95%CI: -0.45 to -0.04). For end-expiratory carbon dioxide, maintaining a certain intensity and increasing the exercise time or increasing the intensity further increased the index significantly, reaching a moderate effect size (SMD=0.61, 95%CI: 0.06 to 1.15; SMD=0.58, 95%CI: 0.04 to 1.13). CONCLUSION: Existing evidence suggests that exercise with masks may have the adverse effect of increasing end-expiratory carbon dioxide and decreasing blood oxygen saturation. The influence of different exercise test time and intensities on the three outcome indexes was different. Wearing a mask during high-intensity exercise can significantly increase heart rate and decrease blood oxygen saturation. Maintaining moderate intensity for a long period or further increasing the intensity of exercise will lead to increased end-expiratory carbon dioxide levels. [ABSTRACT FROM AUTHOR]

BACKGROUND: Resistance exercise increases muscle mass and improves muscle strength, but there is a lack of conclusive evidence on its effects on body composition. Controversial results from randomized controlled trials and multiple Meta-analyses pose a problem for clinical decisions on exercise interventions. OBJECTIVE: Based on the methodological paradigm of umbrella review, to explore the efficacy and safety of resistance exercise in improving the body composition of overweight and obese people. METHODS: We searched PubMed, Cochrane Library, Web of Science, and CNKI for systematic reviews on the effect of resistance exercise in overweight and obese people published from database inception to August 31, 2022. Chinese search terms included “anti-resistance, resistance, self-weight, Meta, Metaanalysis, body composition, body fat percentage, fat mass, lean body mass, body mass.” English search terms included “resistance training, strength training, weight-lifting strengthening program, body composition, body fat distribution, Meta-analysis, data pooling, overviews, clinical trial, clinical trial overviews.” PRISMA was used to evaluate the methodological quality of the included studies, and a GRADE evaluation system was used to grade the quality of evidence. RESULTS AND CONCLUSION: A total of 14 Meta-analyses were included, and GRADE evidence quality evaluation showed that 2 outcome indicators were intermediate, 12 were low, and 14 were extremely low. Compared with the control group, 23 of the 32 outcome measures showed significant improvement. The intervention effect of resistance exercise on body fat percentage has reached a consensus, but the intervention effects on lean body mass, body mass index and visceral fat still need further confirmation. Resistance exercise is an effective and safe method to improve the body composition of overweight and obese people. The overall quality of the research and the evidence quality of the outcome indicators included in the systematic evaluation are generally low. In the future, the initial state, exercise goal and willingness of the subjects should be fully combined on the basis of clarifying the sample characteristics and refining the scheme design. Through multiple, scientific and personalized exercise prescription designs of water, air and elastic resistance, the safety and compliance of resistance exercise can be improved, providing clear evidence-based support and decision-making basis for resistance exercise intervention. [ABSTRACT FROM AUTHOR]

In the experimental teaching of sensor technology course, visual sensor is used to carry out the teaching requirements of non-contact shape detection, and a 3-dimensional shape detection device based on binocular charge couple device( CCD) is designed. Based on the functional analysis of the experimental teaching device, the overall scheme of binocular CCD vision measurement including horizontal and vertical directions is completed. The horizontal direction is reconstructed by multiple image sequences in three dimensions, and the vertical direction passes through different height sections of the measured object. The hardware design is carried out, mainly including image acquisition, mechanical movement and bracket design, and the reliability analysis of the mechanical structure is carried out.According to the working scheme of the device, this paper makes a corresponding theoretical analysis on the two 3-dimensional reconstruction methods so as to give a theoretical basis for the software implementation. The software design is carried out in the Windows environment. The multi-image 3-dimensional reconstruction is performed by integrating VisualSFM, PMSV and Meshlab. At the same time, according to the overall scheme, the corresponding image acquisition program is designed. Finally, the overall 3-dimensional shape detection system is completed, the experimental test is carried out, and the experimental process and result analysis are given in this paper. [ABSTRACT FROM AUTHOR]

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Copyright of Research & Exploration in Laboratory is the property of Research & Exploration in Laboratory and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At present, the experimental construction of industrial engineering has been made a great progress, but there are still some limitations in practical teaching of the ergonomics analysis. In order to make the teaching more intuitive, an evaluation method of assembly operation is established in this paper based on the virtual assembly technology, analytic hierarchy process and fuzzy comprehensive evaluation method. This research then developed an ergonomics experiment platform for the assembly operation using Visual Studio 2013 programming software and C # language. Realization of the ergonomics analysis platform for assembly operation, the effectiveness of main functions, and practical applications are discussed through a simulated experiment. This platform can enhance the students' understanding of the ergonomics and provide an effective experimental method for the ergonomics practice and teaching. [ABSTRACT FROM AUTHOR]