cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.20017488.v1
title: Analysis of localized muscle fatigue in elderly women with and without a history of falls using electromyographic signal frequency parameters

description: One of the problems that most concerns the elderly population is the falling, which can be caused by muscle fatigue. The objective of this study was to compare median electromyographic frequency values for the vastus lateralis muscle and the lateral portion of the gastrocnemius muscle (as parameters of electromyographic fatigue) in elderly people with and without a history of falls. A total of 20 healthy, physically active, elderly women who had or had not suffered falls were enrolled on the study. Median electromyographic signal frequencies were analyzed for the vastus lateralis muscle and the lateral portion of the gastrocnemius muscle in isometric contraction. ANOVA and Student's t test were used for comparisons, to a cutoff of p ≤ 0.05. Median frequencies for the gastrocnemius and vastus lateralis muscles were both higher in the group with a history of falling, but without statistical significance. It was also observed that the rate of decline in median frequency was greater in the group with a history of falling. It can be concluded that elderly people with a history of falling have a greater tendency to fatigue of the gastrocnemius and vastus lateralis muscles than their peers with no history of falling.
DOI: 10.6084/m9.figshare.20017489
title: The relative age effect in soccer: a case study of the São Paulo Football Club

description: The aim of this study was to compare the birth-date distribution of youth athletes of a high-level Brazilian soccer club with the general population of the same age group. In a cross-sectional study, the birth date of 341 youth athletes (under 10-20) was compared with a reference population (live births that occurred in São Paulo state in the same age group; n = 5,480,868). The subjects were divided into quarters of birth: 1st = January-March; 2nd = April-June; 3rd = July-September; 4th = October-December. The chi-square test (χ2) was used to compare the expected (reference population) and observed (athletes) distributions. It was detected a significant difference between the expected distribution and observed distribution (χ2= 29.53; p&lt;0.0001), with a higher percentage of athletes born in the 1st quarter (47.5%) and a lower percentage in the 4th quarter (8.8%). The present results confirm the occurrence of the relative age effect (RAE) during the player selection process in a top-level Brazilian soccer club. The occurrence of this phenomenon during the selection and development of young athletes needs to be taken into account and should be analyzed carefully in order to minimize the loss of potential youth soccer talent. Further studies are required to identify the determinants of RAE and to establish preventive strategies that ensure a more efficient selection process of young soccer players.
DOI: 10.6084/m9.figshare.20017489.v1
title: The relative age effect in soccer: a case study of the São Paulo Football Club

description: The aim of this study was to compare the birth-date distribution of youth athletes of a high-level Brazilian soccer club with the general population of the same age group. In a cross-sectional study, the birth date of 341 youth athletes (under 10-20) was compared with a reference population (live births that occurred in São Paulo state in the same age group; n = 5,480,868). The subjects were divided into quarters of birth: 1st = January-March; 2nd = April-June; 3rd = July-September; 4th = October-December. The chi-square test (χ2) was used to compare the expected (reference population) and observed (athletes) distributions. It was detected a significant difference between the expected distribution and observed distribution (χ2= 29.53; p&lt;0.0001), with a higher percentage of athletes born in the 1st quarter (47.5%) and a lower percentage in the 4th quarter (8.8%). The present results confirm the occurrence of the relative age effect (RAE) during the player selection process in a top-level Brazilian soccer club. The occurrence of this phenomenon during the selection and development of young athletes needs to be taken into account and should be analyzed carefully in order to minimize the loss of potential youth soccer talent. Further studies are required to identify the determinants of RAE and to establish preventive strategies that ensure a more efficient selection process of young soccer players.
DOI: 10.6084/m9.figshare.20017491
title: Prevalence of and factors associated with overweight among university students from Rio Branco, Acre - Brazil

description: The aim of this study was to determine the prevalence of and factors associated with overweight among university students from the city of Rio Branco, Acre, Brazil. A cross-sectional study was conducted on 1,104 students (mean age: 24 years) from Rio Branco, Acre. Overweight was used as the dependent variable. The following independent variables were studied: socioeconomic variables (gender, age, teaching institution, period of study, marital status, income, household members, living with other people, parent's education level, and working or not); self-reported health and morbidity variables (health perception, hypertension, diabetes, and altered cholesterol); lifestyle variables (physical activity, watching television, computer use, smoking, and alcohol consumption). The nutritional status was classified based on body mass index. Univariate analysis was performed using Pearson's chi-squared test or Fisher's exact test. Variables with a p value &lt; 20% on univariate analysis were included in the multiple Poisson regression model. The prevalence of overweight was 35.6%. In the multiple regression model for male students adjusted for age, overweight was associated with marital status, household income, hypertension, and watching television every day. In the model for female students, the variables that remained associated were self-perceived health status, hypertension, and alcohol consumption in the last month. Overweight is determined by a combination of different factors which differed in the present study between men and women.
DOI: 10.6084/m9.figshare.20017491.v1
title: Prevalence of and factors associated with overweight among university students from Rio Branco, Acre - Brazil

description: The aim of this study was to determine the prevalence of and factors associated with overweight among university students from the city of Rio Branco, Acre, Brazil. A cross-sectional study was conducted on 1,104 students (mean age: 24 years) from Rio Branco, Acre. Overweight was used as the dependent variable. The following independent variables were studied: socioeconomic variables (gender, age, teaching institution, period of study, marital status, income, household members, living with other people, parent's education level, and working or not); self-reported health and morbidity variables (health perception, hypertension, diabetes, and altered cholesterol); lifestyle variables (physical activity, watching television, computer use, smoking, and alcohol consumption). The nutritional status was classified based on body mass index. Univariate analysis was performed using Pearson's chi-squared test or Fisher's exact test. Variables with a p value &lt; 20% on univariate analysis were included in the multiple Poisson regression model. The prevalence of overweight was 35.6%. In the multiple regression model for male students adjusted for age, overweight was associated with marital status, household income, hypertension, and watching television every day. In the model for female students, the variables that remained associated were self-perceived health status, hypertension, and alcohol consumption in the last month. Overweight is determined by a combination of different factors which differed in the present study between men and women.
DOI: 10.6084/m9.figshare.20017492
title: Alternative methods for estimating maximum lactate steady state velocity in physically active young adults

description: The aim of this study was to compare the velocities found in the protocols used to measure the indirect individual anaerobic threshold (IATind), glucose threshold (GT) and critical velocity (CV) with the gold standard, the maximum lactate steady state (MLSS) protocol. Fourteen physically active young adults (23±3.1 years; 72±10.97 kg; 176±7 cm; 21±5.36% body fat) performed a 3000-m track running test to determine IATind using the prediction equation and an incremental test on a treadmill to determine GT. The CV was identified by linear regression of the distance-time relationship based on 3000-m and 500-m running performance. The MLSS was identified using two to five tests on different days to identify the intensity at which there was no increase in blood lactate concentration greater than 1 mmol/L between the 10th and 30th minute. A significant difference was observed between mean CV and MLSS (P≤0.05) and there was a high correlation between MLSS and IATind (R2=0.82; P≤0.01) and between MLSS and GT (R2=0.72; P≤0.01). The Bland-Altman method showed agreement between MLSS and IATind [mean difference -0.24 (confidence interval -1.72 to 1.24) km/h] and between MLSS and GT [0.21 (-1.26 to 1.29) km/h]. We conclude that the IATind and GT can predict MLSS velocity with good accuracy, thus making the identification of MLSS practical and efficient to prescribe adequate intensities of aerobic exercise.
DOI: 10.6084/m9.figshare.20017492.v1
title: Alternative methods for estimating maximum lactate steady state velocity in physically active young adults

description: The aim of this study was to compare the velocities found in the protocols used to measure the indirect individual anaerobic threshold (IATind), glucose threshold (GT) and critical velocity (CV) with the gold standard, the maximum lactate steady state (MLSS) protocol. Fourteen physically active young adults (23±3.1 years; 72±10.97 kg; 176±7 cm; 21±5.36% body fat) performed a 3000-m track running test to determine IATind using the prediction equation and an incremental test on a treadmill to determine GT. The CV was identified by linear regression of the distance-time relationship based on 3000-m and 500-m running performance. The MLSS was identified using two to five tests on different days to identify the intensity at which there was no increase in blood lactate concentration greater than 1 mmol/L between the 10th and 30th minute. A significant difference was observed between mean CV and MLSS (P≤0.05) and there was a high correlation between MLSS and IATind (R2=0.82; P≤0.01) and between MLSS and GT (R2=0.72; P≤0.01). The Bland-Altman method showed agreement between MLSS and IATind [mean difference -0.24 (confidence interval -1.72 to 1.24) km/h] and between MLSS and GT [0.21 (-1.26 to 1.29) km/h]. We conclude that the IATind and GT can predict MLSS velocity with good accuracy, thus making the identification of MLSS practical and efficient to prescribe adequate intensities of aerobic exercise.
DOI: 10.6084/m9.figshare.20017495.v1
title: Perception of professional competence of Brazilian college coaches

description: The aim of this study was to analyze the perceived level of professional competence of Brazilian college coaches, considering the type of sports discipline and professional development cycles. The target population consisted of 92 sport coaches of both genders from various regions of Brazil, who worked in team or individual sports. An adapted version of the Self-Perception of Competence Scale was used for data collection. Statistical analysis was performed by Chi-squared and Fisher's exact tests, adopting a level of significance of 5%. The coaches perceived themselves as competent in knowledge on the theory and methodology of sports training and sports biodynamics, as well as in the skills of sports planning and management. On the other hand, the coaches perceived fragility of knowledge on sports management and legislation. With respect to professional development cycles, more experienced coaches perceived themselves as more competent than those with a shorter coaching experience. When coaches of individual and team sports were compared, a significant difference (p = 0.04) was only observed for knowledge on sports management and legislation, with coaches of team sports perceiving themselves as more competent. Further studies are needed to improve the basic and continuing education of Brazilian sport coaches, as well as to obtain a better understanding of the relationship between career development and the acquisition of professional skills.
DOI: 10.6084/m9.figshare.20017495
title: Perception of professional competence of Brazilian college coaches

description: The aim of this study was to analyze the perceived level of professional competence of Brazilian college coaches, considering the type of sports discipline and professional development cycles. The target population consisted of 92 sport coaches of both genders from various regions of Brazil, who worked in team or individual sports. An adapted version of the Self-Perception of Competence Scale was used for data collection. Statistical analysis was performed by Chi-squared and Fisher's exact tests, adopting a level of significance of 5%. The coaches perceived themselves as competent in knowledge on the theory and methodology of sports training and sports biodynamics, as well as in the skills of sports planning and management. On the other hand, the coaches perceived fragility of knowledge on sports management and legislation. With respect to professional development cycles, more experienced coaches perceived themselves as more competent than those with a shorter coaching experience. When coaches of individual and team sports were compared, a significant difference (p = 0.04) was only observed for knowledge on sports management and legislation, with coaches of team sports perceiving themselves as more competent. Further studies are needed to improve the basic and continuing education of Brazilian sport coaches, as well as to obtain a better understanding of the relationship between career development and the acquisition of professional skills.
DOI: 10.6084/m9.figshare.20017497
title: Gait stability in diabetic peripheral neuropathy

description: The aim of this study was to evaluate gait stability in diabetic patients with peripheral neuropathy in three conditions: habitual walking with eyes open, walking with eyes closed, and walking with eyes open and narrow base of support. The study included 41 subjects, 18 with neuropathy (NG) and 23 controls. Gait stability was evaluated on a baropodometer using the Footwalk Pro software. The following data were obtained: gait speed and percentage of time spent in double stance and single stance. Significant differences were observed between groups in all three conditions for gait speed and single stance time, which were reduced in NG (p&lt;0.05), and for double stance time, which was increased in NG (p&lt;0.05). For gait speed, double stance time and single stance time, the eyes open condition differed from the eyes closed (p&lt;0.001) and narrow base of support (p&lt;0.001) conditions. In the three conditions studied, patients of NG presented a deficit in gait stability and this performance was even more compromised in the two conditions that required greater postural control. These gait changes resulting from the complexity imposed by the different conditions suggest the inclusion of these conditions in the evaluation and treatment of this population.
DOI: 10.6084/m9.figshare.20017498
title: Impact of coping strategies on resilience of elite beach volleyball athletes

description: Studies have shown that for developing a resilient profile athletes must deal with adversities in sports using personal resources such as optimism, competitiveness, motivation, maturity, and persistence. The objective of this study was to analyze the impact of coping strategies on the resilience of beach volleyball athletes. Forty-eight adult athletes of the Banco do Brasil Beach Volleyball Circuit participated in the study. The following instruments were used: Athletic Coping Skills Inventory-28 (ACSI-28) and Connor-Davidson Resilience Scale (CD-RISC). The data were analyzed using the Shapiro-Wilk test, Mann-Whitney U test, repeated-measures ANOVA with post hoc Bonferroni test, Spearman's correlation test, and simple linear regression (p&lt;0.05). The coping skills that had an impact on the resilience of athletes were "personal coping resources" (48%), "coping with adversity" (33%), "confidence and motivation" (25%), "goal setting/mental preparation" (12%), and "coachability" (9%). Athletes invited to the Brazilian team showed high levels of resilience [median=91.50 (84.0-94.0)] and the most frequently used coping skills were "peaking under pressure" (MD=2.25), "coping with adversity" (MD=2.62), "goal setting/mental preparation" (MD=2.75) and "confidence and achievement motivation" (MD=2.75). It was concluded that the use of coping strategies to overcome problems, having defined goals, motivation and concentration during competitions have a significant impact on the development of a resilient profile in elite athletes.
DOI: 10.6084/m9.figshare.20017498.v1
title: Impact of coping strategies on resilience of elite beach volleyball athletes

description: Studies have shown that for developing a resilient profile athletes must deal with adversities in sports using personal resources such as optimism, competitiveness, motivation, maturity, and persistence. The objective of this study was to analyze the impact of coping strategies on the resilience of beach volleyball athletes. Forty-eight adult athletes of the Banco do Brasil Beach Volleyball Circuit participated in the study. The following instruments were used: Athletic Coping Skills Inventory-28 (ACSI-28) and Connor-Davidson Resilience Scale (CD-RISC). The data were analyzed using the Shapiro-Wilk test, Mann-Whitney U test, repeated-measures ANOVA with post hoc Bonferroni test, Spearman's correlation test, and simple linear regression (p&lt;0.05). The coping skills that had an impact on the resilience of athletes were "personal coping resources" (48%), "coping with adversity" (33%), "confidence and motivation" (25%), "goal setting/mental preparation" (12%), and "coachability" (9%). Athletes invited to the Brazilian team showed high levels of resilience [median=91.50 (84.0-94.0)] and the most frequently used coping skills were "peaking under pressure" (MD=2.25), "coping with adversity" (MD=2.62), "goal setting/mental preparation" (MD=2.75) and "confidence and achievement motivation" (MD=2.75). It was concluded that the use of coping strategies to overcome problems, having defined goals, motivation and concentration during competitions have a significant impact on the development of a resilient profile in elite athletes.
DOI: 10.6084/m9.figshare.20017500.v1
title: Comparison between running performance in time trials on track and treadmill

description: Few studies have investigated the influence of test environment (field vs. laboratory) on pacing strategy and on physiological variables measured during endurance running performance tests. The objective of this study was therefore to compare the behavior of mean velocity (MV), pacing strategy, heart rate (HR) and rating of perceived exertion (RPE) during one-hour running time trials conducted on an athletics track with the behavior of the same variables during one-hour running time trials conducted on a treadmill. Eighteen male recreational runners (25.4 ± 3.3 years) performed two one-hour time trials; the first running on a treadmill and the second on a 400 m athletics track. Rating of perceived exertion and HR were recorded every 10 minutes and MV was calculated every 15 minutes for analysis of pacing strategy (0-15min; 15-30min; 30-45min; and 45-60min). These performance variables were compared using Student's t test for paired samples. Figures for MV, HR and RPE measured at different points during the trials were compared using two-factor ANOVA for repeated measures, followed by Bonferroni's post hoc test. A significance level of P &lt; 0.05 was adopted for all analyses. Mean velocity was higher for the trials on the running track (12.2 ± 0.8 km·h-1) than for the trials on the treadmill (11.8 ± 0.8 km·h-1). Additionally, there were also differences between the two test environments for mean and maximum heart rate, and in terms of pacing strategy. On the basis of these differences, it can be concluded that performance was influenced by the environment in which the one-hour time trials were conducted.
DOI: 10.6084/m9.figshare.20017500
title: Comparison between running performance in time trials on track and treadmill

description: Few studies have investigated the influence of test environment (field vs. laboratory) on pacing strategy and on physiological variables measured during endurance running performance tests. The objective of this study was therefore to compare the behavior of mean velocity (MV), pacing strategy, heart rate (HR) and rating of perceived exertion (RPE) during one-hour running time trials conducted on an athletics track with the behavior of the same variables during one-hour running time trials conducted on a treadmill. Eighteen male recreational runners (25.4 ± 3.3 years) performed two one-hour time trials; the first running on a treadmill and the second on a 400 m athletics track. Rating of perceived exertion and HR were recorded every 10 minutes and MV was calculated every 15 minutes for analysis of pacing strategy (0-15min; 15-30min; 30-45min; and 45-60min). These performance variables were compared using Student's t test for paired samples. Figures for MV, HR and RPE measured at different points during the trials were compared using two-factor ANOVA for repeated measures, followed by Bonferroni's post hoc test. A significance level of P &lt; 0.05 was adopted for all analyses. Mean velocity was higher for the trials on the running track (12.2 ± 0.8 km·h-1) than for the trials on the treadmill (11.8 ± 0.8 km·h-1). Additionally, there were also differences between the two test environments for mean and maximum heart rate, and in terms of pacing strategy. On the basis of these differences, it can be concluded that performance was influenced by the environment in which the one-hour time trials were conducted.
DOI: 10.6084/m9.figshare.20017501
title: Performance prediction of endurance runners through laboratory and track tests

description: The objectives of this study were: 1) determine and compare physiological indexes from laboratory and track tests (Université de Montréal Track Test - UMTT) in endurance runners; 2) analyze the predictive capacity of VO2max, vVO2max and AT with the running performance at 1,500 m, 5,000 m and 10,000 m time trials; 3) analyze the effects of running distance on the relationship between the physiological indexes with aerobic performance. The study included 10 moderately trained endurance runners who performed the following series of tests on different days: 10,000 m, 5,000 m, and 1,500 m time trials on a 400 m track; two maximal incremental tests (laboratory and track) to determine the VO2max, vVO2max, and AT. There were no significant differences between VO2max, vVO2max and AT determined in both protocols. The multiple regression analysis revealed that vVO2max was the only index from laboratory associated with running performance at 1,500 and 5,000 m (62 and 35%, respectively). In addition, vVO2max from UMTT explained the running performance for the same previous distance (78 and 66%, respectively). On the other hand, the AT determined in both incremental tests explained 38 and 52% of performance at 10,000 m time trial, respectively. Thus, the prediction of endurance performance of long distance runners using VO2max, vVO2max and AT determined in the laboratory and UMTT tests depends on the running distance.