United States Sports Academy

Modern large-scale, high-traffic systems demand deployment strategies that minimize user impact while enabling rapid and frequent releases. Progressive delivery techniques such as blue/green deployments, canary releases, and feature flags have emerged as industry-standard practices to reduce deployment risk while preserving velocity. Prior research and industry reports show that staged exposure and fast rollback mechanisms significantly reduce change failure rates and improve recovery times in distributed systems [1], [5]. This paper presents a metrics-driven framework for designing and operating these deployment strategies in production-grade systems. We integrate service-level objectives (SLOs) [3], error budgets [4], and DORA metrics [5] with automated traffic shaping, observability, and governance. Through real-world-inspired case studies, we demonstrate how progressive delivery reduces blast radius, improves mean time to recovery (MTTR), and enables safe experimentation at scale. Finally, we discuss future directions including AI-assisted rollout optimization and policy-as-code deployment governance.

Objective. To study the opinion of experts on supporting measures for young professionals in health care. Material and methods. In 2024, a survey of 28 experts holding senior overhead posts in the state medical organizations of the Stavropol Territory was carried out. Descriptive statistics of the survey results is presented by relative indicators calculated per 100 respondents and expressed as a percentage. Arithmetic mean and standard deviation were used to describe the quantitative data. Results. The mean age of experts was 56.5±7.3 years, total medical experience — at least 15 years, length of service on senior positions in health care — not less than 10 years. According to the experts, high level of infrastructure development (60.7%), proximity of human settlement to the regional center (53.6%) and possibility to live and work in their birthplace (46.4%) are among the priority factors for young doctors in choice of their place of work. In the experts’ assessment of the attractiveness factors of work in public health organizations for young doctors, such parameters as stability of salary (4.61±0.96 scores), availability of annual paid leave (4.46±0.96 scores) and resilience of the organization during crisis periods (4.39±1.03 scores) obtained the highest rating. Insufficient material and technical equipment ranked first — 3.46±1.45 scores, insufficiently comfortable living conditions ranked second — 3.43±1.45 scores among the shortcomings of work in public health organizations for young doctors in the opinion of experts. Insufficient salary level (3.29±1.56 scores) and restrictions of the doctor’s activity by established standards (3.29±1.56 scores) received the same estimate and the third ranking position. Benefits provided to medical workers (3.25±1.1.79 scores), opportunities for prospects and career advance (2.96±1.73 scores) as well as possibility of independent life (2.71±1.65 scores) could be the main factors for attracting young doctors to work in rural health organizations. Conclusion. The opportunity of professional and career development is the main factor that can attract young doctors to the medical profession, and the possibility of financial stability and security should be first of all the factor of choice of professional trajectory of medical school graduates. The desire to be a specialist of a narrow profile is an important factor that attracts graduates of medical universities for the work in the chosen specialty. Experts believe that the high level of infrastructure development influence the young doctor’s choice of location for his job.

The threats of financial crisis, social tension, political instability, as well as the danger of a humanitarian catastrophe are common to the entire world community, but they have a particularly strong impact on developing countries. The purpose of the article is to research current agriculture development trends in Kazakhstan in the context of the integration of the world economy and the development of guidelines for improving the state of the sector. The following general scientific methods were used in the research: the methods of analysis, synthesis and formalization; graphical methods, methods of statistical analysis, method of comparisons, analysis of dynamics and structure; method of causal and logical relationships and dependencies; SWOT analysis and minimax analysis. As a result of the research, a retrospective of the agricultural industry in Kazakhstan was considered, the climatic and geographical conditions in which it develops, as well as the degree and directions of state support were determined. The current world trends in the agricultural sector were studied and the directions of their development in Kazakhstan were determined. The research is aimed at improving the efficiency, environmental friendliness and productivity of agricultural enterprises in Kazakhstan based on a study of the initial conditions, the current state and global trends in the development of the sector. Key words: agro-industrial sector; SWOT analysis; Kazakhstan; food marketing; sustainable development.

This study was conducted to evaluate the efficacy of three body mass index (BMI) based equations (BEQ) used to estimate body-fat percentage (BF%) in female-collegiate dancers in relation to air-displacement plethysmography (AP). Methods: Data from 28 collegiate dancers were assessed for this study. Body mass and height were measured to calculate BMI. Three BEQ to estimate BF% [Jackson et al. (JBMI), Deurenberg et al. (DBMI), and Womersley & Durnin (WBMI)] were compared to BF% estimated via AP. Results: The following estimates of BF% were produced: AP = 24.6 ± 4.7%; JBMI = 21.9 ± 4.0%; DBMI = 23.8 ± 2.2%; and WBMI = 24.7 ± 2.5%. There were no differences (p > 0.05) for the BF% estimations between AP, DBMI, or WBMI. However, BF% estimated via JBMI was lower than AP (p = 0.04), DBMI (p < 0.001), and WBMI (p < 0.001). Only moderate correlations were found between AP and BEQ (JBMI, r = 0.43; DBMI, r = 0.44; WBMI, r = 0.43). The limits of agreement (constant error ± 1.96 SD) for each BEQ compared to AP were: JBMI = -2.6 ­­± 9.1%; DBMI = -0.8 ­­± 8.1%; and WBMI = 0.2 ± 8.2%. Conclusions: Two BEQ produced similar group means to AP. However, all BEQ had a wide range of individual differences when compared to AP. An accurate, inexpensive, and practically feasible method of assessing body composition is valuable for sport practitioners. The results of this study demonstrate that DBMI and WBMI may be acceptable in a field setting for estimating BF% for a large group of female collegiate dancers. However, due to the large range of differences, none of the BMI-based equations should be utilized to predict BF% for individuals. It is suggested that other field methods of predicting BF% be used in female collegiate dancers due to individual error of BEQs and potential harm in providing misinformation. Key Words: air-displacement, body mass index, percent fat, dancers

Wheelchair basketball is an intense sport played at the recreational, intercollegiate- and Paralympic-levels. Limited research has investigated the impact of tire pressure on performance and physiological measures relevant in wheelchair basketball. PURPOSE: To assess the impact of differing tire pressures on recreational wheelchair basketball players’ sprint times and associated physiological responses. METHODS: Seven experienced-wheelchair-basketball athletes (5 males, 2 females) performed a total of four trials, separated by 72 hrs. The first trial was a familiarization trial and the remaining three were experimental trials. During the experimental trials, tire pressures were set at either 551.6 kpa (LP), 689.5 kpa (MP), or 824.4 kpa (HP) and conducted in a counterbalanced order. Baseline blood lactate levels and heart rate were collected prior to each testing session. After baseline measures were collected, participants underwent a 10-minute, dynamic warm-up. Following the warm-up, a modified version of the 5-10-5 drill, modified T-drill, and sprint endurance drill were completed as performance tests. The sprint endurance drill consisted of four, full-court, down-and-back sprints (224 m). After the completion of each performance test, time to completion (s), HR (bpm), and RPE (Borg) were immediately collected during the mandatory one-minute rest between tests. Following the completion of all performance tests, lactate accumulation at via finger blood draw at minutes 2, 5, 8, 12, 15, 18 and 22 post. RESULTS: An omnibus, two-way, repeated-measures ANOVA (time x treatment) did not detect an interaction or main-effect for HR, RPE, or lactate accumulation (all p = 0.91). Of note, pair-wise comparisons for performance variables revealed slower times for LP when compared to HP for the 5-10-5 drill (LP = 15.12 ± 2.05 s vs. HP = 14.66 ± 1.88 s, p = 0.016, d = 0.7), the T-drill (LP = 17.48 ± 2.37 s vs. HP = 16.53 ± 2.08 s, p = 0.007, d = 1.0) and sprint endurance (LP = 85.63 ± 12.82 s vs. HP = 82.93 ± 11.76 s, p = 0.011, d = 1.2) and no pair-wise differences included MP. CONCLUSIONS: Modest decreases in tire pressure did not impact physiological strain or RPE; however, effect size data support the need for additional research with respect to performance changes with larger decreases in tire pressure.

Williams, JJ, Heron, R, Spradley, B, and Saracino, P. Postactivation potentiation effect of heavy sled towing on subsequent sprints. J Strength Cond Res 35(5): 1229-1233, 2021-Recent research supports heavy sled towing as a tool used to improve subsequent sprints as part of postactivation potentiation (PAP) protocols. The purpose of this study was to examine the effect of heavy sled towing using a velocity decrement (Vdec) on subsequent unloaded sprinting in high school football (soccer) athletes sprinting on artificial turf. A sled load equating to a 40-50% Vdec range was used (66-70% body mass). Fifteen (n = 9 boys and n = 6 girls) high school football players volunteered for this study. The sled-towing intervention consisted of a dynamic warm-up, 3 submaximal sprint efforts (50, 75, and 95%), and 3 maximum speed 15-m sled sprints, separated by 2-minute rests, of which the fastest time was recorded for analysis. Peak preintervention 15-m baseline sprint times were compared with peak post sled-towing 15-m sprint times using a paired samples t-test. Thirteen of 15 athletes ran faster peak post sled-towing sprint times than peak preintervention baseline sprint times (9 boys and 4 girls). On average, peak post sled-towing sprint times (2.60 ± 0.10 seconds) were 0.10 seconds faster (p < 0.0001; Cohen's d = 0.92) than peak preintervention baseline sprint times (2.70 ± 0.09 seconds). This research established that sled-towing protocols using loads corresponding to Vdec of 40-50% significantly improved subsequent sprints in high school football (soccer) athletes running on artificial turf.

The need for concussion-related safety programs in high-school athletics is well recognized. To that end, valid-baseline assessments are compulsory in order for medical staff to identify athletes suspected of having a concussion and best inform appropriate medical-treatment protocols. PURPOSE: To determine the between-trial reliability of the King-Devick Test (KD) as part of a pre-season concussion-safety program in young-male high-school athletes. METHODS: KD baseline score data from high-school, male athletes (n = 377, aged 16 ± 1 years) were recorded on electronic tablets and later analyzed. The testing required participants to complete two, error-free trials, which were reported to the nearest 0.0 s. For both trials, descriptive data were reported, mean differences were examined via paired-samples t-tests, Cohn’s d effect sizes were considered, and two-way mixed-effects intraclass correlations (ICC) were implemented. RESULTS: The KD test showed strong reliability between trials (Trial 1 = 56.0 ± 15.2 s; Trial 2 = 53.3 ± 13.8 s; single-measure ICC = 0.93; 95% CI 0.91 - 0.94). Furthermore, similar reliability was observed when KD scores were grouped by Best score and Worst score (Best = 52.8 ± 13.6 s; Worst = 57.6 ± 15.3 s; single-measure ICC = 0.95; 95% CI 0.94 - 0.96). Paired-samples t-test identified small-differences between both pairings (Trail 1 vs. Trial 2, p < 0.001, d = 0.25; Best vs. Worst, p < 0.001, d = 0.33). Most participants (78.5%) recorded their Best score on Trial 2. CONCLUSIONS: The KD test showed excellent reliability between trials in this population of young-male athletes. However, additional research is warranted with respect to how many valid baseline attempts are needed to acquire a stable KD score to best support safe-monitoring practices.

The aims of this study were to (1) compare the immediate post-treatment effects of an instructional video versus a self-preferred program on the hip range of motion and a pressure pain threshold using two different density roller balls, and (2) compare the effects of the two roller balls on those variables. Forty adults were randomly allocated into four groups: (1) MB1-video, (2) MB1-self-preferred, (3) MBX-video, and (4) MBX-self-preferred. Participants followed a video or a self-preferred program using either a moderate (MB1) or a hard (MBX) density ball. Main outcomes were passive hip internal rotation, external rotation, and a pressure pain threshold. For MB1, the video produced greater outcomes than the self-program for external rotation (10◦ versus 2◦), internal rotation (7◦ versus 2◦), and the pain threshold (210 kPa versus 44 kPa). For MBX, the video produced greater outcomes than the self-program for external rotation (8◦ versus 1◦), internal rotation (5◦ versus 1◦), and the pain threshold (184 kPa versus 30 kPa). When comparing roller balls, the MB1 produced greater outcomes than the MBX for external rotation (10◦ versus 8◦), internal rotation (7◦ versus 5◦), and the pain threshold (210 kPa versus 184 kPa) with the video. For the self-preferred program, the MB1 produced greater outcomes for external rotation (2◦ versus 1◦), internal rotation (2◦ versus 1◦), and the pain threshold (44 kPa versus 30 kPa). The instructional video and a moderate density ball produced greater immediate post-treatment outcomes than the self-program and a hard density ball. Professionals should consider using the video to teach technique and match clients to a specific density-type roller ball.

ABSTRACTPurpose: In Australian Football (AF), the ability to proficiently kick the ball is a critical skill and has been shown to be advantageous to a team’s successful performance; however, a valid and reliable match referenced kicking assessment remains absent. Therefore, the aim of this study was to develop a valid and reliable AF kicking proficiency assessment comparative to match play kicking performance. Method: Youth male Australian Football players (n = 251) from different stages within the AF talent pathway were recruited. The developed AFFB-DKA (Australian Football Field-Based—Dynamic Kicking Assessment) considered particular constraints of match play kicking demands such as kick type, distance, delivery, and locomotion of the player receiving the ball. In total, 14 kicks were completed during the test. Validity (i.e., content, logical and construct) and reliability (i.e., test re-test) were assessed. Results: Findings indicate the kicking test can distinguish across and between age (i.e., U14; U16; U18) and skill groups (i.e., club; sub-elite; elite). The timeframe between U14 and U16 was identified as a potential key period where kicking skill acquisition may be most impressionable; however, further research is recommended to support this. Conclusion: The developed AFFB-DKA is the first Australian Football specific kicking assessment to consider and apply match play kicking constraints to make a more representative, valid and reliable assessment.

Tort reform advocates take varying dispositions regarding whether or not comparative fault tort reform has sufficiently compromised the ethical practices of sports industry practitioners. It follows that two of the best place to look for evidence supporting or refuting such claims is in the laws that govern sports and the sports cases that have been brought before the courts regarding the rights of individuals within the communities in which those individuals exist. Consequently, the aim of this chapter is to provide an overview of the role of comparative fault tort reform in sports cases. Examination appears regarding how that role has factored into meeting societal demand calling for a re-definition of fairness, as well as changes in the ethical codes of sports practitioner acumen.