Endurance Quality Research Articles

A151: The Monitoring of Health-Related Indices on Chinese Undergraduates Before, During, After COVID-19

Background/Purpose: China, as the first country who suffered the outbreak of COVID-19, reacted quickly to prevent the transmission of the epidemic by lockdown policy. Today, it has been one year since China declared the end of COVID-19. This research intended to explore the real effects of the pandemic on contemporary undergraduate physical fitness by screening and analyzing National Students Fitness Test data, comparing the data before, during, and after COVID-19. Method: Research has analyzed National Students Fitness Test data in the periods before, during, and after COVID-19 in a Chinese university, discussing the effects of COVID-19 such as the difference in body shape, respiratory system function, body strength, speed, flexibility quality, and endurance quality. In total, 14,708 college students participated, including 6,125 males and 8,583 females. In the analysis approach, using SPSS 26.0, paired-samples T test compared mean differences within the data. Students came from different provinces with sufficient cultural diversity, which attenuates risk of bias. Results: Before the outbreak, the BMI index of college students was 20.15, and it rose to 20.31 during the outbreak, as well as 20.45 at the end of the epidemic. Before the epidemic, the 50 m time was 8.48 s, which increased to 8.81 s during the epidemic and 8.77 s at the end of the epidemic. Before the outbreak, standing long jump was 182.1 cm, 178.9 cm during the outbreak, and 182.84 cm after the outbreak. The sit-and-reach was 13.26 cm before the outbreak, 15.9 cm during the outbreak, and 16.2 cm after the outbreak. The vital capacity was 3,230.87 before the outbreak, 3,201.52 during the outbreak, and 3,091.11 after the outbreak. The endurance index decreased first and then increased, and the overall difference was small compared with before the epidemic, while the strength index declined for three consecutive tests. Conclusion/Discussion: According to the comparison of the data before, during, and after the outbreak, the study found that the epidemic influenced the students' BMI to continue to rise, and their strength and vital capacity to continue to decline, which was greatly affected. However, endurance and explosive power rebounded after the pandemic.

A040: The Effect of Blended Online and Offline Physical Education on the Health-Related Indexes of Undergraduates

Background/Purpose: With the explosive development of artificial intelligence, many scholars have carried out research around the combination of online and offline physical education courses. Current research has focused on developing the application of information technology in the classroom teaching of physical education. The main purpose addressed in this study was to investigate the possible effects of implementing such a blended online and offline physical education at home on the health-related indices of students. Method: Totally 14,708 college students participated, including 6,125 males and 8,583 females. In the analysis approach, research was adopted using SPSS 26.0, specifically the paired-samples T test to compare data between two semesters. By analyzing the Nation Students Fitness Test data in a Chinese university, studies have discussed the effects of blended PE courses, such as the differences in body shape, respiratory system function, body strength, speed, flexibility quality, and endurance quality before and after the curriculum. These students came from different provinces with sufficient cultural diversity, which ensures the results won't be biased. Results: After a whole semester, for females BMI declined from 19.85 kg/m2 to 19.82 kg/m2, the Vital capacity from 2666.07 ml to 2617.96 ml, 800-m run consumed time increased from 240.31 s to 242.40 s, standing long jump and sit and reach had increased from 155.10 cm to 159.97 cm and from 17.17 cm to 17.57 cm, respectively; The 50-m sprint had decreased from 9.61 s to 9.53 s, timed sit-ups fluctuated from 36.41 n to 36.40 n. While for males, BMI increased from 20.36 kg/m2 to 20.41 kg/m2, vital capacity had decreased from 3188.00 ml to 3085.17 ml, 1000-m run consumed time increased from 248.41 s to 251.60 s, sit and reach and pull-ups declined slightly from 14.71 cm to 14.64 cm and 10.50 n to 10.16 n, respectively. 50-m sprint (7.91 s to 7.85 s) and standing long jump (208.84 cm to 215.38 cm). Conclusion/Discussion: Based on the results, although the decline of students' vital capacity and endurance running were obvious, the data supported that blended curriculum exerted a desirable influence and is a great additional option for PE courses to help students offset sedentary behavior while improving undergraduates' explosive power, body strength, and speed. The blended physical education curriculum should be explored further.

Эстетические свойства жанра классической китайской поэзии цы и духовно-нравственная основа их становления с точки зрения «красоты слабости как добродетели»

The article analyzes the aesthetic properties of the genre of classical Chinese poetry Сi and the spiritual-moral basis of their formation from the point of view of the concept “The beauty of weakness as virtue”, put forward by the famous specialist in the field of classical Chinese poetry Ye Jiaying. The relevance of the topic is determined by the fact that, although many classical Chinese Ci poems have been translated into Russian, there is little research on the aesthetic properties of the genre itself, especially from the point of view of modern Chinese poetic theory. The article uses methods of description, interpretation, historical-cultural and contextual analysis. The article aims is to explain the aesthetic properties and the reason for their formation from the point of view of the concept “The beauty of weakness as a virtue”. It is ahown that the aesthetic properties of the Ci lie in the presence of a deeply hidden, inexhaustible understatement in poetry. Formally, this is created by alternating long and short verses; at the semantic level, the understatement in poetry appeared as a result of the forced transformation of the inexpressible feelings and emotions of the poet, who was in a weak position, but at the same time showed the quality of endurance, restraint and commitment to something good. The influence of the ideas of Confucianism on the formation of the aesthetic properties of Ci poetry allows us to speak not only about its artistic-aesthetic, but also its spiritual-moral significance. Altogether, it allows us to give a decent assessment of the Ci genre, which for a long time was perceived as a genre less valuable than the Shi genre.

Innovative Teaching Models for Endurance Quality for Female Students in Vocational Education under Modern Educational Concepts

With the deepening of the concept of equality in education, physical education for girls in higher vocational colleges is gradually gaining more attention. However, girls' participation and endurance quality in sports activities are often underdeveloped, partly due to the disconnection between traditional teaching mode and modern education needs. Modern educational concepts emphasize individualized teaching and gender equality, requiring educators to not only provide skills training but also to stimulate students' intrinsic motivation and provide them with opportunities for all-round development. In this context, the endurance quality teaching model for senior girls is facing an important need for innovation. Based on this, this paper aims to explore the innovative path of endurance quality teaching for female students in higher vocational colleges and universities, including increasing the investment in sports facilities, developing comprehensive training courses, updating teachers' educational concepts, and enhancing students' motivation to participate. Through these measures, not only can the sports participation and physical performance of female students be improved, but also the comprehensive development of female students and the realization of gender equality education can be promoted.

Construction of Wushu Routine Training Program for Wellness Promotion in Secondary School Students

Background and Aim: As an important way of small and medium-sized sports communication, the current schools propose to stimulate the physical quality of middle school students in Wushu training. Wushu training is also to train primary and middle school students to enhance their physical fitness, enhance their self-confidence, and improve their emotional conditions. Therefore, the research goal of this paper is to promote the construction of healthy Wushu sports training programs for middle school students. The main research objects of this paper are middle school students. Research method: this study adopts the literature method, questionnaire method, and experimental comparison method of the exercise intervention of middle school students’ physique and mental health, in this paper, a total number of 50 students in Xianyang City, 50 were tested, and 30 could not be tested due to some reasons, such as lower limb injury, cardiopulmonary disease, and other symptoms. Result: After the eight-week Wushu routine exercise training intervention, the lung capacity increased (endurance quality), sitting forward flexion (flexibility quality), high leg lift (coordination ability), and 50 m short distance running (speed strength quality) were all improved and enhanced. the improvement of emotional state, self-confidence, and the improvement of anti-frustration ability to establish a sense of achievement reduce anxiety, and resist depression was significantly reduced. the subjects of lung capacity increase, flexibility, coordination, speed strength and aerobic endurance, anxiety, and depression mood significantly decreased. The results: the main ways to stimulate the physical quality of middle school students through Wushu routine training. It shows that wushu routine training can not only improve the physique of middle school students, but also promote mental health, and provides a certain basis for exercise training practice through exercise intervention experiments. Conclusion: After the eight-week Wushu routine training intervention, the lung capacity increased (endurance quality), sitting forward flexion (flexibility quality), high leg lift (coordination ability), and 50 m short distance running (speed strength quality) were all improved and enhanced. the improvement of emotional state, and self-confidence, and the improvement of anti-frustration ability to establish a sense of achievement reduces anxiety and resist depression was significantly reduced.

High-intensity resistance training improves quality of life, muscle endurance and strength in patients with myositis: a randomised controlled trial

Myositis is associated with reduced quality of life, which is accompanied by significant impairments in muscle endurance and strength, altogether representing cardinal traits in patients with myositis. This randomised controlled trial aimed to investigate the effect of high-intensity resistance training on quality of life in patients with myositis. Thirty-two patients with established, stable myositis were randomised to 16 weeks of high-intensity resistance training (intervention group) or 16 weeks of usual care (control group). Primary outcome was quality of life assessed as the change in the physical component summary score (PCS) of the Short Form-36 health questionnaire from baseline to post-intervention. Secondary outcomes included functional capacity measures, such as functional index 3, and International Myositis Assessment and Clinical Studies Group (IMACS) disease activity and damage core set measures, including manual muscle testing 8 (MMT8). The primary outcome PCS showed an improvement in favour of high-intensity resistance training with a between-group difference of 5.33 (95% CI 0.61; 10.05) (p = 0.03). Additionally, functional index 3 showed a between-group difference indicating greater gains with high-intensity resistance training 11.49 (95% CI 3.37; 19.60) (p = 0.04), along with a between-group improvement in MMT8 1.30 (95% CI 0.09; 2.51) (p = 0.04). High-intensity resistance training for 16 weeks effectively improved quality of life in patients with myositis. Clinical measures of muscle endurance and muscle strength were also found to improve with high-intensity resistance training, while patients stayed in disease remission. Consequently, progressively adjusted high-intensity resistance training is feasible and causes no aggravation of the disease, while benefitting patients with myositis.Clinical trial registration: Clinicaltrials.gov ID: NCT04486261—https://clinicaltrials.gov/study/NCT04486261.

The Effect Of General Exercise Program Combined With Cognitive Functional Therapy On Pain, Quality Of Life And Muscle Endurance Of Women With Chronic Non-Specific Low Back Pain

The Effect Of General Exercise Program Combined With Cognitive Functional Therapy On Pain, Quality Of Life And Muscle Endurance Of Women With Chronic Non-Specific Low Back Pain

Influence of basalt fiber and polypropylene fiber on the mechanical and durability properties of cement-based composite materials

To boost the mechanical strength and endurance quality of cement-based composites, basalt fiber and polypropylene fiber have been included cement-based composites in a single-doped and mixed manner, respectively. Through the tests of flexural strength, compressive strength, drying shrinkage and freeze-thaw cycle, the mechanics properties and endurance quality of cement-based composites with different fiber contents were analyzed. Scanning electron microscopy and a mercury intrusion test were used to compare and study the microstructure and pore structure properties of cement-based composites. The results indicate that the improvement of compressive strength for cement-based composites by single adding basalt, polypropylene fiber and mixed addition of two kinds of fibers is not obvious, but improving the flexural strength of composites by single addition of fiber and 1:1 mixing in a certain dosage range is effective. Among them, 1:1 mixed fiber shows a better advantage superposition effect, which shows better enhancement and toughening effect on composites. Fiber single doping and 1:1 mixing can reduce the Drying shrinkage and mass loss rate of the composites within a certain range, and enhance the composites' ability to resist Drying shrinkage and freezing. Based on the comprehensive mechanical properties and durability tests, it is recommended that the content range of the two fibers mixed with 1:1 is 0.4 %–0.6 %. Both basalt fiber and polypropylene fiber can be closely combined with the cement matrix, and randomly distributed in the composite material to form a network structure, which has the function of series skeleton, effectively inhibits the generation and expansion of cracks in the composite material, and improves the microstructure of the composite material. Both basalt fiber and polypropylene fiber can reduce the harmful pores and multi-harmful pores of the composite material, and transform them into harmless pores and less harmful pores, refine the internal pore structure of the composite material, and improve its compactness. The two kinds of fibers are randomly distributed to form a network structure, which refines the large pore size inside the composite material and blocks the connected pores, and the basalt fiber is refined to fill the interface between the polypropylene fiber and the cement matrix, so that the composite material is more compact, thereby significantly improving the mechanical properties and durability of the composite material.

Physiology and biomechanics researches of the special preparedness and contention activity of highly skilled kayakers

Purpose — development of methodology for individual evaluating special fitness and competitive activity of highly skilled kayakers.
 The rationality of the rower’s movement structure is largely determined by the character of work and interaction of the posterior and anterior bundles of the deltoid muscle, which perform the rower’s arm movements during applying both “pulling” and “pushing” efforts. The following causes of individual rowing technique errors significantly affecting sports result were identified: general muscle rigidity, lack of sufficiently complete and timely muscle relaxation; untimely involvement of muscles in work (appearance of mutual activity zones of antagonist muscles); late start of muscle activity (inertial moments of movement of rower's body biolinks are not provided before water entrapment); protracted, too long muscle activity (movement is performed entirely at the expense of muscular activity, without the use of inertial and propelling forces); low speed of muscle engagement in work leading, as a rule, to the “drop” of efforts on the oar. Two groups of athletes with diametrically opposite levels of physical capacity development and one group, which was characterized by their uniform development, were distinguished. The first group was distinguished by the high indices of power and efficiency of the work performed while covering the competitive distance. Such athletes showed higher sports results on short distances. The second group was distinguished by high indices of the efficiency of applying efforts, symmetry of movements, and successful performances on long competitive distances. Such rowers were classified as athletes with predominant development of special endurance quality. The rowers of the third group differed in the average values of the above mentioned indices and demonstrated equal success on both short and long competitive distances. Athletes with preferential development of speed-strength qualities and rowers with an advantageous development of special endurance have no significant difference in speed of covering 500 m distance and heart rate. However, there are significant differences in other indices of special fitness. Rowers with even development of physical qualities have differences in all recorded indices compared to those of the first two groups.
 The individual peculiarities of rowers’ movement coordination during covering a competitive distance of 500 m were determined. All rowers are divided into two groups. The first group is characterized by rational coordination of movements at the beginning of the distance covering and pronounced disturbances in the work dynamics of the muscles of the body turn and the nature of effort applied to the oar at the end of the distance. In the second group, we encounter the opposite phenomenon: with an irrational movement structure at the beginning of the distance, there is a transition of work to a more correct character at the end of its covering. The most preferable option for increasing the efficiency of athletes’ technical preparation is the use of the methodology for designing generalized and individual models of motor action structure. Preparation of rowers with account for their predisposition to the formation of the most important components of sportsmanship is the most preferable option. When drawing up individual plans for the preparation of athletes, the coaches should take into account these practical recommendations and adhere to the recommended directions of training. Repeated examinations (four months later) revealed the effectiveness of managing the process of technical preparation of kayakers based on the correction of intermuscular coordination.

Regional differences of physical fitness and overweight and obesity prevalence among college students before and after COVID-19 pandemic since the "double first-class" initiative in China.

Physical fitness has been widely recognized as a powerful marker of health in children and adolescents, and it negatively affected by the COVID-19 pandemic. The construction of world-class universities and first-class disciplines, known as the "Double First-Class" Initiative (DFC), is a major commitment made by the Chinese government to adapt to changes in the educational environment, both domestically and internationally, in order to promote the development and practice of international higher education. The aim of the study was to look deep into the regional differences of physical fitness and overweight and obesity prevalence among college students before and after the COVID-19 pandemic since the DFC. The original physical fitness parameters of students from 10 DFC universities and colleges in Central South China were downloaded from the official website of Chinese National Student Physical Fitness Database (CNSPFD) and then divided into 3 groups based on the pandemic periods: pre-pandemic (2019), the first year after pandemic outbreak (2020), and the second year after pandemic outbreak (2021). All the data were stored in Excel 2010, analyzed by SPSS 17.0, and plotted with ArcGIS 10.4. The total "fail" percentage (from 9.19% in 2019 to 12.94% in 2021) and the prevalence of overweight and obesity in boys (from 22.53 to 29.25% in 2021) exhibited a continuous increase year by year, and among all the physical fitness indicators the score of strength in boys and endurance quality in all individuals were the lowest in overweight and obesity groups. Students with 'fail' rate developed from northern and northeastern province to southern areas from 2019 to 2021. For grade 2019th, overweight and obesity students who also failed the test had covered nationwide and the most affected areas including northeast, east, as well as central north in senior year. The distribution of overall fitness assessments in Hubei province was in accordance with the national data, and the overall scoring growths in both class of 2021st and 2022nd were measured with a negative increase (p < 0.01). The government and related functional departments should take into consideration the student regional sources, especially in western and northeast regions of China, and school polices and physical education (PE) teachers should pay more attention to put training efforts on endurance for all adolescents and strength for boys and the group of overweight and obesity who also failed in the standard test, when designing specific interventions to promote physical health and counteract the negative effects of COVID-19 pandemic in college students.

An algorithmic study of periodization strategy optimization in combined anaerobic and anaerobic fitness training for improving athletes’ endurance qualities

Abstract The principle of flexibility and change should be adopted in the process of physical training, and the optimization of periodization training strategy can only be reasonably carried out according to the specific training response of athletes in order to improve the overall athletic ability of athletes. This paper utilizes the sports training pyramid as a guide, scrutinizes the endurance qualities athletes should possess, and suggests an optimization process for the periodization training strategy, which integrates multiple elements of periodization training. Based on the physiological characteristic indexes of athletes’ cardiorespiratory endurance, a model of cardiorespiratory endurance with different periodization training and different frequencies was established, and the results of the model were inputted into a BP network model optimized by the artificial fish swarm algorithm, thus realizing the prediction of the athletes’ cardiorespiratory endurance. The maximum value of the athletes’ endurance predicted by the ASFA-BP model was 81.09N, which differed from the actual value of the athletes’ endurance only by 1.58%, and the difference in the average lung capacity index (ALCI) was only 1.58%. The difference in mean spirometry index fluctuated between [0.16 mL/kg and 0.29 mL/kg]. The optimal duration of the periodization training strategy based on the acquired endurance data was between 10 and 18 days, and the exercise training load should be reduced by approximately 46% to 65%. The effective prediction of athletes’ endurance quality can help optimize the periodization training strategy and improve athletes’ competitive level faster.

Prediction and optimization of individual skill development patterns in physical education based on big data analysis

Abstract This paper proposes a data-based gray preprocessing neural network optimization model based on the principle of the BP neural network model and its optimization method. SPSS statistical software was used for statistical analysis to compare the student physical education test data of S college students from 2019 to 2023. The GA-BP optimization prediction model is applied to generate and process the raw data of 5-year sports tests to find the law of systematic changes and generate the data sequence with strong regularity so as to predict the condition of the future development trend of things. The results show that the measured and actual numbers have a high rate of conformity, and the maximum error is 0.67%, which is high accuracy. The overall speed and strength of boys and girls in sports is on the rise. The overall endurance level of boys is increasing while the overall endurance level of girls is decreasing. In the future, endurance training should be strengthened as a way to improve the continuing trend of low endurance quality among students.

A112: Effects of Healthy Physical Education Curriculum Model of China on Student Physical Fitness

Purpose: The development of Healthy Physical Education Curriculum Model of China (HPE-C) was aimed for students’ physical and mental health. Some studies have proved that the application of HPE-C can effectively improve Chinese primary and secondary school students' physical fitness. However, the results of these studies were not uniform due to the differences in intervention methods, experimental periods, and regions. Consequently, the purpose of this study was to specifically synthesize the evidence for HPE-C for Chinese primary and secondary school students’ physical fitness. Methods: An extensive online search, utilizing keywords such as 'Healthy Physical Education Curriculum Model of China,' 'Primary school,' 'Middle school,' 'High school,' 'Application effect,' and 'Experimental study,' yielded over 80 published studies within the past 7 years. The databases employed for the search included CNKI, CQVIP, and the WanFang database. The eligibility criteria required that the research: (a) had full-text availability, (b) involved primary and secondary students aged 7-18 years in China, (c) conducted a randomized controlled trial or quasi-experiment, and (d) reported essential parameters such as sample size, mean difference, and standard deviation. Since the outcome measures were continuous variables, mean difference or standardized mean difference was utilized. Effect sizes, along with 95% confidence intervals, were calculated using Review Manager 5.4 software, and the heterogeneity among effect sizes was assessed through I² statistics. Results: A total of 81 studies and articles were considered for inclusion and 11 studies qualified for this review. Seven studies used 50-meter running to test the speed quality of students, had an effect size of -0.24, 95%CI[-0.30,-0.18], Z=7.73 (p &lt; 0.00001). Five studies used sit and reach to test the flexibility quality of students, had an effect size (mean difference) of 0.59, 95%CI[-0.03,1.20]， Z=1.87(p=0.06). Four studies used stand long jump to test the strength quality of students with an effect size (mean difference) of 4.66, 95%CI[2.16,7.17], Z=3.65(p=0.0003). Five studies tested the student’s endurance quality with 1000-meter running for male students and 800-meter running for female students, had an effect standardized mean difference of -12.56, 95%CI[-20.47,-4.65], Z=3.11(p=0.002). Conclusions: This meta-analysis shows that the application of HPE-C had an significant effect on the speed, strength and endurance of Chinese primary and secondary school students, but the effects on flexibility is not significant. Teachers should attach importance to the exercise of students' flexibility in order to promote the all-round development of students' physical fitness when applying HPE-C.

Efficacy and prognostic impact of Pericarpium Trichosanthis injection combined with nicorandil for intractable angina pectoris in elderly patients: A retrospective study.

Coronary artery disease (CAD) is a leading cause of global cardiovascular mortality. Refractory angina pectoris, a manifestation of CAD, requires effective drug treatments. Pericarpium Trichosanthis injection, a traditional Chinese medicine, improves cardiovascular symptoms, while nicorandil alleviates spasms and angina. Both have potential in treating CAD. To investigate the therapeutic effects of combining Pericarpium Trichosanthis injection and nicorandil in elderly patients suffering from refractory angina caused by coronary heart disease. A retrospective analysis was conducted on the data of 130 patients diagnosed with refractory coronary heart disease. Based on the different treatment regimens administered during hospitalization, the patients were divided into a control group (58 cases) and a study group (72 cases). The control group received conventional treatment, which included aspirin, statins, and nitrate vasodilators. In addition to the conventional medication, the study group received a combination treatment of Pericarpium Trichosanthis injection and nicorandil. After treatment, the study group showed significantly higher left ventricular ejection fraction and cardiac output, and lower brain natriuretic peptide and C-reactive protein levels compared to the control group. The study group also exhibited improvements in angina, quality of life, exercise endurance, and lipid profiles. Multivariate logistic regression analysis revealed a relationship of lipid levels and heart function with the combined treatment. Some patients in the study group experienced headaches during treatment, but no significant adverse reactions were observed. Follow-up showed that the treatment was well-tolerated, with no drug-related adverse reactions detected. Combination of Pericarpium Trichosanthis injection and nicorandil is more effective than conventional treatment in improving symptoms and heart function in elderly patients with refractory angina pectoris.

Feasibility and Proof-of-Concept of Delivering an Autonomous Music-Based Digital Walking Intervention to Persons with Parkinson's Disease in a Naturalistic Setting.

Reduced motor automaticity in Parkinson's disease (PD) negatively impacts the quality, intensity, and amount of daily walking. Rhythmic auditory stimulation (RAS), a clinical intervention shown to improve walking outcomes, has been limited by barriers associated with the need for ongoing clinician input. To assess the feasibility, proof-of-concept, and preliminary clinical outcomes associated with delivering an autonomous music-based digital walking intervention based on RAS principles to persons with PD in a naturalistic setting. Twenty-three persons with PD used the digital intervention independently for four weeks to complete five weekly 30-minute sessions of unsupervised, overground walking with music-based cues. The intervention progressed autonomously according to real-time gait sensing. Feasibility of independent use was assessed by examining participant adherence, safety, and experience. Intervention proof-of-concept was assessed by examining spatiotemporal metrics of gait quality, daily minutes of moderate intensity walking, and daily steps. Preliminary clinical outcomes were assessed following intervention completion. Participants completed 86.4% of sessions and 131.1% of the prescribed session duration. No adverse events were reported. Gait speed, stride length, and cadence increased within sessions, and gait variability decreased (p < 0.05). Compared to baseline, increased daily moderate intensity walking (mean Δ= +21.44 minutes) and steps (mean Δ= +3,484 steps) occurred on designated intervention days (p < 0.05). Quality of life, disease severity, walking endurance, and functional mobility were improved after four weeks (p < 0.05). Study findings supported the feasibility and potential clinical utility of delivering an autonomous digital walking intervention to persons with PD in a naturalistic setting.

Electric Field of the Heart on the Thorax Surface in Highly Trained Athletes during Initial Ventricular Activity

The article is focused on the study of the electrical remodeling of the “sports heart” using multichannel ECG mapping to make a more detailed and informative analysis of the excitation of the myocardium remodeled by sport activity. The study of the heart electrical activity was carried out from 64 unipolar electrodes on the thorax surface synchronously with standard limb leads in highly trained cross-country skiers (n = 15) and young non-trained men (n = 19) at rest. The amplitude-temporal and spatiotemporal characteristics of the electric field of the heart were measured. By the typical distribution of areas of the negative and positive cardiac potentials the durations of depolarization and its individual phases were estimated. ECGII was used to determine the duration of the R-R, PQ (PR), QRS, QT, QTc intervals; in the unipolar lead V5 the R-wave peak time (RWPTV5) was measured. In athletes, the duration of PQII, QTII, QTcII, RWPTV5 intervals were statistically significantly longer than in non-trained men. Analysis of the electrical field of the heart showed a difference in the ratio of the phases of ventricular depolarization in athletes and non-trained individuals at rest. The onset of ventricular depolarization and the first inversion of cardiac potential in athletes were significantly earlier than in non-trained people, while the completion and total duration of the period of ventricular depolarization did not differ. In skiers, the duration of the first inversion was significantly longer than in non-trained individuals; a tendency to shortening of the second period of stable location of potentials on the thorax surface was also shown. The use of surface ECG mapping made it possible to reveal differences in the spatiotemporal organization of heart ventricular depolarization between cross-country skiers and non-trained men at rest. The results of the study may be useful in the analysis of the electrical remodeling of the heart in athletes training the physical quality of endurance.

Physical fitness of Tibetan adolescents at different high altitudes in Tibet, China: A comparative study.

High altitude hypoxic environment has a certain negative impact on physical fitness of adolescents. We aimed to understand the physical fitness status of Tibetan adolescents in different high-altitude areas in Tibet, China. Physical fitness items, such as grip strength, standing long jump, sit and reach, 50 m dash, 1000 m run for boys, and 800 m run for girls were tested on 3806 Tibetan adolescents by using stratified whole group sampling method in class units. The mean age of the participants was (15.51 ± 1.69) years for Tibetan males and (15.54 ± 1.69) years for females. One-way analysis of variance (ANOVA) and other methods were used to make cross-sectional comparisons of physical fitness performance of Chinese Tibetan adolescents in different high-altitude regions. The standing long jump scores of boys (203.37 ± 28.36) were higher than that of girls (152.97 ± 19.46) and the lowest standing long jump scores of adolescents in Shigatse region (166.39 ± 35.04). The highest level of sit and reach was found among boys (10.69 ± 5.34) in Nyingchi and the lowest level of sit and reach was found among girls (8.42 ± 5.84) in Shigatse. Shigatse region adolescents had the lowest performance in 50 m dash (9.09 ± 1.72) while the best performance in 1000 m run (266.23 ± 35.82) and 800 m run (245.40 ± 27.92). There is variability in the physical fitness of Tibetan adolescents in different high-altitude regions of Tibet, China. Targeted physical fitness interventions should be carried out for Tibetan adolescents in different high-altitude regions. The focus should be on improving the endurance quality of Tibetan adolescents in Lhasa and the lower limb muscle strength, flexibility, and speed quality of adolescents in Shigatse.

Retention of older veterans with serious mental illness in a clinical exercise program.

Older adults with serious mental illness (SMI) have compromised physical function that could be improved with exercise; however, retention in exercise programs is a challenge. This study was a retrospective analysis of retention for the 150 older veterans with SMI that enrolled in Gerofit, a clinical exercise program offered in the Veterans Health Administration. Chi-square and t-tests were conducted to evaluate baseline differences between those that were and were not retained at six and 12 months. Retention was 33% and better health-related quality of life and endurance were related to retention. Future work is needed to improve exercise program retention in this population.

An improved CLVA method for evaluating the endurance quality level of young male basketball players with 2-tuple linguistic neutrosophic information

For a long time, the level of endurance quality of our male basketball athletes is not high, and there is a gap with the strongest countries in Europe and America. The former head coach of Chinese men’s basketball team diagnosed the biggest problem of Chinese men’s basketball team and Chinese youth men’s basketball team is the poor quality of endurance. It is especially important to strengthen the endurance training of our basketball players and improve their endurance level. However, from the current situation, the teams in the training due to the lack of standards for endurance quality training has led to a great blindness in endurance quality training. The endurance quality level evaluation of young male basketball players is a classic multiple attribute group decision making (MAGDM) issue with vague, inconsistent, and indeterminate information. The 2-tuple linguistic neutrosophic sets (2TLNSs) is an appropriate form to express the indeterminate decision-making information in the endurance quality level evaluation of young male basketball players. Therefore, in this paper, the 2-tuple linguistic neutrosophic numbers CLVA (2TLNN-CLVA) is built based on traditional close value (CLVA) method and applies it to evaluate the endurance quality level of young male basketball players. Finally, a numerical example for evaluating the endurance quality level of young male basketball players has been given and some decision comparisons are also conducted to further illustrate the advantages of the 2TLNN-CLVA method.

A Group-Based, Videoconference-Delivered Physical Activity Program for Cancer Survivors.

Virtually supervised, group-based exercise presents an innovative way to expand the reach of exercise-oncology programs and help cancer survivors increase physical activity (PA) and connect with other participants. This study examined the feasibility, acceptability, and preliminary effects of a group-based PA program delivered exclusively using videoconferencing software. This study used a single-group pre-post design. The 8-wk program consisted of aerobic and resistance exercise sessions once per week and three PA behavior change discussion sessions in groups of four to six. Feasibility was determined by enrollment, retention, safety, and adherence. Postprogram surveys evaluated acceptability using a Likert scale and open-ended responses. Changes in PA (Godin Leisure-Time Exercise Questionnaire), quality of life (QOL; Functional Assessment of Cancer Therapy- General), and upper and lower body muscular endurance (bicep curl and sit-to-stand test) were also evaluated. Enrollment was feasible (n = 61 of 65 who expressed interest in the program), and retention (86.9%) and adherence (88% for exercise, 91% for discussion) were high; no adverse events were reported. Participants (mean age, 59.9 ± 10.1 yr; 96.2% female; 64.2% ovarian cancer, 28.3% breast cancer, 7.5% other cancer) reported they enjoyed the program (median, 7 of 7), and videoconferencing software was easy to use and had good video and audio quality (median, 5 of 5). From preprogram to postprogram, participants increased their weekly minutes of aerobic (mean (SD) change, 82.4 (144.2)) and resistance (mean (SD) change, 31.9 (42.7)) PA; sit-to-stand (mean (SD) change, 1.4 (3.9)) and bicep curl (mean (SD) change, 5.3 (6.8)) repetitions; and emotional (mean (SD) change, 0.82 (2.3) points), functional (mean (SD) change, 1.2 (3.6) points), and total QOL (mean (SD) change, 3 (7.9) points; all P < 0.05). A group-based PA program delivered using videoconference technology is feasible and acceptable for cancer survivors, and may increase PA and improve physical fitness and some aspects of QOL. A larger, controlled intervention is needed to determine efficacy, as well as pragmatic studies to directly compare this approach with conventional strategies (i.e., face-to-face programs).