Journal of Applied Sports Sciences最新文献

{"title":"RED BLOOD CELL DEFORMABILITY AND PHYSICAL ACTIVITY","authors":"I. Ivanov","doi":"10.37393/jass.2022.02.8","DOIUrl":"https://doi.org/10.37393/jass.2022.02.8","url":null,"abstract":"Physical exertion and sport cause changes of different nature and degree (positive or negative, strong, weak, moderate) in blood and blood cells’ biomechanical and fluid properties. The aim of this minireview was to attempt to summarize the main red blood cell deformability alterations during and after physical activity classified as follows: erythrocyte geometric shape; erythrocyte membrane rheological properties; biochemical and structural properties of erythrocyte membrane lipids and proteins; hemoglobin concentration; calcium ion concentration; intracellular diffusion and osmosis; nitric oxide and erythrocyte nitric oxide synthase; erythrocyte ATP synthase; erythrocyte age and degree of erythrocyte cell maturation; body and erythrocyte temperature. It is essential to study and evaluate the individual hemorheological response profile of erythrocyte deformability during physical activity because it is strongly personal. This is one of the major erythrocyte properties determining oxygen supply to working muscles. The multiple hemorheological changes during physical activity and their interconnectedness and strong personality make their differentiation very difficult. It is reasonable to weigh their effects (with specific quantitative measurements) to simplify the analysis and increase the likelihood of obtaining valid conclusions. But there will always be the probabilistic nature of these conclusions, determined by the complex and strictly individual picture of the hemorheological effects of physical exercises and activities.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45882302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COUNTERMOVEMENT JUMP FORCE-TIME METRICS AND MAXIMAL HORIZONTAL DECELERATION PERFORMANCE IN PROFESSIONAL MALE BASKETBALL PLAYERS","authors":"Nicolas M Philipp, D. Cabarkapa, Drake A Eserhaut, Damjana V. Cabarkapa, A. Fry","doi":"10.37393/jass.2022.02.2","DOIUrl":"https://doi.org/10.37393/jass.2022.02.2","url":null,"abstract":"Basketball is a sport that relies heavily on an athlete’s ability to rapidly decelerate in order to change direction, avoid a defender, or create space. Recent literature has proposed novel ways of measuring maximal horizontal deceleration using radar technology. The aim of this study was to investigate the relationships between different countermovement jump (CMJ) force-time characteristics and metrics related to maximal horizontal deceleration for a sample of professional male basketball players. To gain further insight into performance qualities that influence horizontal deceleration performance, athletes were separated into high- and low-performance groups for all horizontal deceleration metrics, using a median split analysis, and differences in CMJ force-time metrics were investigated between groups. The results revealed no significant correlations between any CMJ force-time metrics and horizontal deceleration performance. However, athletes’ height and body mass were correlated with different deceleration performance measures, such as average deceleration, horizontal deceleration impulse, and time to stop. Higher performing athletes with regards to average horizontal deceleration and horizontal braking impulse relative to body mass generated greater concentric power (effect size (ES) = 1.04, ES = 0.86) and concentric velocities (ES = 1.17, ES = 0.97), as well as greater jump heights (ES = 1.19, ES = 0.99). Reactive Strength Index modified values were also greater in the higher performing group for horizontal braking impulse relative to body mass (ES = 1.06). On the other hand, higher-performing athletes with regard to horizontal braking impulse generated greater eccentric deceleration force (ES = 0.81) and eccentric power values (ES = 0.88) in the CMJ. Findings may be of interest to practitioners physically preparing basketball players for the sport-specific deceleration actions they may encounter.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44699664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COMPARISON OF PERIODIZATION MODELS: A CRITICAL REVIEW WITH PRACTICAL APPLICATIONS","authors":"Gustavo Api, Danilo Arruda","doi":"10.37393/jass.2022.02.7","DOIUrl":"https://doi.org/10.37393/jass.2022.02.7","url":null,"abstract":"Periodization has been used for years in the sports domain as a method of controlling and planning training to reach the highest performance and decrease injury risk. Several periodization models have been developed, such as traditional, block, and undulating. Those models are theoretical training structures designed to facilitate understanding, study, and organization of training. Based on studies, certain models have shown to be superior to others. For instance, block periodization seemed to be more efficient for advanced athletes than traditional and undulating models. While for novice athletes, the chosen model has not seemed to affect their development. Although periodization has been largely studied, the experiments have several limitations, such as considering only training variation as periodization, using short-term investigations, and disregarding the technical and tactical components. Therefore, this critical review aimed to describe and discuss the contents related to traditional, block, and undulating periodization models and to provide coaches with a practical application of each of those models to develop strength, power, and endurance for novice and advanced athletes.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48229844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF PHYSICAL DEVELOPMENT OF ADOLESCENT WRESTLING COMPETITORS’ BASIC MOTOR QUALITIES","authors":"I. Iliev","doi":"10.37393/jass.2022.02.4","DOIUrl":"https://doi.org/10.37393/jass.2022.02.4","url":null,"abstract":"The research aimed to establish the level of variability of some major indicators characterizing the physical development of adolescent wrestling competitors’ basic motor qualities. The research was carried out in 2021 with the age group 12-14 years, and the results had to be compared with those obtained from a survey in 2012. The research was done among 22 coaches and wrestling specialists (part of whom are Olympic, World, and European champions) and 79 boys, divided into three age groups as follows: U12 –25, U13 –32, and U14 –22. Sports-pedagogical testing and an interview were used for the purposes of the research, as well as a review of literary sources and their theoretical analysis. The results from the research were processed statistically with Microsoft Office Excel 2016 and IBM SPSS Statistics - v23. We applied the following statistical methods: variation analysis, comparative analysis with Student’s t-criterion, Cohen’s d, Kolmogorov-Smirnov, and Shapiro-Wilk tests. The summary of the data and the analysis made for the three researched groups established variability of some basic indicators characterizing the physical development of basic wrestling qualities. There were three main groups of indicators in the three groups of researched individuals: indicators with low variability, relatively high variability, and very high variability. There was a decrease in the difference in the coefficient of variation in most physical indicators and an improvement in the mean values from U12 to U14. The hypothesis was confirmed that the final results after the surveys held in 2021 would be lower than those obtained in 2012. The obtained data are interesting for the specialists because they enrich training methods with new facts, which are essential for increasing the efficiency of sports preparation in sports clubs and national teams.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47286985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MATH MODEL OF RUNNING INDEX FOR EVALUATION AND CONTROL OF SPECIFIC EFFICIENCY AND TRACING THE FATIGUE LEVEL IN LONG-DISTANCE RUNNING","authors":"M. Konchev, Dimcho Mitsov, Silvia Ilieva-Sinigerova","doi":"10.37393/jass.2022.01.3","DOIUrl":"https://doi.org/10.37393/jass.2022.01.3","url":null,"abstract":"The aim of this case study was to develop and verify a math model of running index (RI) for evaluation and control of specific efficiency and tracing the fatigue level in long-distance running. The suggested RI was modeled on the basis of polynomial function between the running velocity and the change in heart rate frequency (V=f(HR)). The method was designed in such a way that the influence of denivelation of the terrain was removed when calculating RI. The research was done among 19 highly qualified athletes competing in long-distance running events (16 men and 3 women), with a mean age of 28 years (SD±8), BMI 20 (SD±2), maximum oxygen consumption 67 ml/min/kg (SD ±5). The participants in the research were subjected to two lab and two terrain surveys. In a period of one week after the testing, RI was traced and calculated on the basis of the data taken from the major training loads. The model was verified only for the studied subjects - highly qualified competitors in long-distance running. RI was tested for validity through comparing the values obtained from the lab and terrain tests. The obtained results showed there was no significant difference between the values of RI measured during the lab testing and the terrain testing compared to the values of the velocity of ventilatory and lactate anaerobic threshold (VAnT). The results from this research revealed that the suggested method for calculation of the running index is more accurate than the previous ones. This manuscript discusses the possible implications of this new method for measurement of RI. Future scientific research is needed to prove its efficiency and applicability in sports.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43919813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE EFFECT OF TRAINABILITY ON THE PHYSICAL FITNESS OF YOUNG ATHLETES","authors":"I. Bonova, S. Kolimechkov, P. Mavrudiev, Dimcho Mitsov, Daniela Dasheva","doi":"10.37393/jass.2022.01.5","DOIUrl":"https://doi.org/10.37393/jass.2022.01.5","url":null,"abstract":"Athletic talent represents a high level of trainability in a certain type of sport. The earlier the level of trainability is identified, the more effective the sports training of the athlete will be. The aim of this study was to establish the effect of trainability on the physical fitness of adolescent athletes as a consequence of an applied training program adequate to the age and sports experience of the athletes. This study included 52 young athletes (24 boys and 28 girls), divided into 4 groups: male athletes from the control group (n = 10, mean age 14.88 ± 1.29 years), male athletes from the experimental group (n = 14, mean age 13.72 ± 1.15 years), female athletes from the control group (n = 14, mean age 15.69 ± 1.00 years), and female athletes from the experimental group (n = 14, mean age 13.41 ± 1.68 years). The experimental groups followed a specialized 12-week program signed for the purposes of the study. All participants completed the Alpha-Fit physical fitness test battery in addition to specific fitness tests before and after the training intervention. This study showed significant differences with larger effect sizes in nearly all components of health-related and specific physical fitness for the experimental groups after the training intervention in contrast to the control groups. The results of the standing long jump in the male (184.57 ± 19.79 cm vs 200.79 ± 20.01 cm, effect size = 0.8) and female athletes (179.07 ± 18.56 cm vs 183.93 ± 16.26 cm, effect size = 0.3) from the experimental groups showed significantly better values after the intervention, which indicated that strength is highly trainable for both genders at this age (13-14 years of age). The results of this study showed that the effect of trainability on physical fitness was greater for the athletes who were following the specialized training program based on the expected transfer of development in physical qualities.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43647999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"VALIDATION OF A TEST FOR THE STUDY OF VIOLENCE AMONG ATHLETES","authors":"Mihail Georgiev, Ina Vladova","doi":"10.37393/jass.2022.01.8","DOIUrl":"https://doi.org/10.37393/jass.2022.01.8","url":null,"abstract":"The lack of a validated methodology severely hampers the study of violence among athletes. Questionnaires and surveys with unproven psychometric characteristics used in various studies cast doubt on the results obtained. The current study presents the results of the construction of a test to investigate violence among athletes. The test is based on the questionnaire for the study of violence among athletes proposed by Vertommen et al. (2016), as its final version is a modified methodology. The study includes 314 current and former athletes. The survey was conducted online. Exploratory and confirmatory factor analysis were applied to the empirical data. The analysis results provide the basis for adopting a two-factor test structure with corresponding physical and emotional abuse subscales.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42644678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFECT OF A NITRIC OXIDE PRE-WORKOUT SUPPLEMENT ON MUSCULAR ENDURANCE","authors":"Mason Mcintosh, R. Cochrum, Ryan T. Conners, Vanessa Moreno, Michael Black, J. Heimdal","doi":"10.37393/jass.2022.01.1","DOIUrl":"https://doi.org/10.37393/jass.2022.01.1","url":null,"abstract":"Introduction: Multi-ingredient dietary supplements have been developed to increase nitric oxide (NO) production, with the expectation of improving resistance training performance. Many of these supplements contain ingredients and/ or ingredient amounts that have yet to be studied for their synergy or efficacy in increasing NO production and thus, resistance training performance. Purpose of the study: A randomized crossover design was used to investigate the effect of a citrulline malate (CM) based non-stimulant nitric oxide pre-workout supplement (NOPWS) blend or placebo on Young Men’s Christian Association (YMCA) bench press performance. Applied Methodology: Thirty minutes were provided between NOPWS or placebo ingestion and YMCA bench press assessment. Pre/post heart rate was taken following each condition. Two- and one-way repeated measures ANOVAs (α = 0.05) were run to determine the effect of each condition on heart rate (HR) and the number of repetitions performed (respectively) during the bench press test. Achieved major results: There was a significant two-way interaction between the treatment and time for HR, F(1, 20) = 6.82, p = .017. Resting HR was significantly higher during the supplement session (M = 74.67, SE = 2.54 bpm) than during the placebo session (M = 69.14, SE = 2.31 bpm), F(1, 20) = 8.19, p = .010, ηp2 = .290. No significant difference was found between conditions for number of repetitions performed. Leads: A specific CM-containing NOPWS blend had no significant effect on a standardized assessment of upper body muscular endurance. Practical implications: These findings highlight the need for consideration of the minimum effective dosage and assimilation timing of each respective ingredient when developing or researching pre-workout supplement blends. Originality/Value: This is the first known research to study the effectiveness of this specific blend of ingredients on resistance training performance. Thus, this study provides necessary foundational knowledge for future research in this area.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41605010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFECT OF COVID-19 LOCKDOWN ON SPORTS PERFORMANCE PARAMETERS OF COMPETITIVE ATHLETES","authors":"Rupak Singh, J. Rastogi, C. Guru, Varad Apte, K. Datta, Atul Sharma","doi":"10.37393/jass.2022.01.2","DOIUrl":"https://doi.org/10.37393/jass.2022.01.2","url":null,"abstract":"Background: Nationwide lockdown was enforced due to the spread of the new Coronavirus-19. This resulted in cessation of all sports training across the country, including elite athletes. This COVID-19 lockdown was hypothesized to result in detraining effects on elite athletes. Aim: We aimed to study the impact of COVID-19 lockdown on athletes’ physiological and anthropometric sports performance parameters. Methodology: Seventy-five athletes (age: 23.25 ± 3.9 years, training experience 7.49 ± 3.5 years) from different sports participated voluntarily. International Physical Activity Questionnaire was used to grade home-based non-super- vised physical activity undertaken during COVID-19 lockdown (137.81 ± 39.20 days). We compared the measured anthropometric, aerobic, and anaerobic performance parameters post-lockdown with pre-lockdown competitive phase recordings using Kruskal Wallis non-parametric test. Parameters were expressed as mean ± SD with level of significance fixed at p < .05. Results: Statistically significant reduction of 33.28% was observed in aerobic capacity post- COVID-19 lockdown (p = .01). We did not find any statistically significant variation in the other anthropometric and physiological performance parameters, namely weight (↑17.50 %), body mass index (↑20.69 %), body fat mass (↑20.76 %), waist (↑21.07 %), hip (↑19.13 %), waist: hip ratio (↑10.71 %), peak power (↑11.32 %) and mean power (↑5.17 %). Conclusions: We found that the athletes exhibited generalized detraining features despite maintaining home-based physical activity. Compared to other performance parameters, there was a significant decrease in the aerobic capacity post-lockdown. This shows the importance of incorporating an indoor-based supervised program including aerobic exercises to guide and monitor athletes. Practical Implications: Off-season/home confinement requires a remotely supervised tailored exercise program with optimal stimuli to maintain training adaptations. Awareness and incorporation of these findings would aid coaches and trainers in designing training programs to promote athletes’ injury-free gradual return to sports.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47705546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFECTIVENESS OF MANUAL THERAPY ADDED TO CONVENTIONAL PHYSIOTHERAPY PROTOCOL IN PATIENTS WITH SURGICALLY TREATED PROXIMAL HUMERAL FRACTURES","authors":"Lyubomira Toteva, E. Dimitrova","doi":"10.37393/jass.2022.01.9","DOIUrl":"https://doi.org/10.37393/jass.2022.01.9","url":null,"abstract":"Proximal humerus fractures are the third most common fractures in adult patients. In developed economies, there is a tendency to increase the number of these fractures due to the aging population. Physical therapy is recognized as an important component in the management regardless of the fracture type or treatment protocol. The purpose of this blind, randomized study was to compare the effectiveness of two physical therapy interventions on the shoulder range of motion and function after surgical treatment of proximal humerus fracture: 1) supervised therapeutic exercise only (Control group – CG), 2) supervised therapeutic exercise with manual soft tissue mobilization and massage (Experimental group – EG). Ninty-six subjects diagnosed with proximal humerus fracture treated operatively were randomly assigned to one of these two groups. The rehabilitation included four phases, in each of which the patients underwent ten procedures. Shoulder range of motion was assessed with a universal goniometer for flexion, extension abduction, internal rotation, and external rotation. International SFTR method of measuring and recording joint motion was used. The results were analyzed with the statistical program SPSS Statistics 19. At the end of the study, we found statistically significant better results in the EG in flexion (152.8° ± 22.3°), abduction (145.3° ± 24.2°), external (61.1° ± 11.8°), and internal (75.3° ± 11.6°) rotations, compared to CG: flexion (140.7° ± 22.0°), abduction (130.6° ± 24.4°), internal (51.8° ± 15.6°) and external (63.5° ± 14.1°) rotations with statistical significance (p < 0.05). The extension showed improvement in both study groups, within the EG results being 52.9° ± 15.9° and in the CG 49.9° ± 5.5° - with no statistically significant difference between them. The DASH (Disabilities of the Arm, Shoulder, and Hand) scale was used for functional assessment of upper extremity. We established that the application of manual soft tissue mobilization with massage in the postoperative rehabilitation of patients with proximal humerus fractures leads to more effective restoration of shoulder joint function.","PeriodicalId":34626,"journal":{"name":"Journal of Applied Sports Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49110592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}