Performance In Physical Fitness Tests Research Articles

Unsupervised Machine Learning inCountermovement Jump andIsometric Mid-Thigh Pull Performance Produces Distinct Combat andPhysical Fitness Clusters inMale andFemale U.S. Marine Corps Recruits.

Several challenges face the U.S. Marine Corps (USMC) and other services in their efforts to design recruit training to augment warfighter mobility and resilience in both male and female recruits as part of an integrated model. Strength and power underpin many of the physical competencies required to meet the occupational demands one might face in military. As the military considers adopting force plate technology to assess indices of strength and power, an opportunity presents itself for the use of machine learning on large datasets to deduce the relevance of variables related to performance and injury risk. The primary aim of this study was to determine whether cluster analysis on baseline strength and power data derived from countermovement jump (CMJ) and isometric mid-thigh pull (IMTP) adequately partitions men and women entering recruit training into distinct performance clusters. The secondary aim of this study is then to assess the between-cluster frequencies of musculoskeletal injury (MSKI). Five hundred and sixty-five males (n = 386) and females (n = 179) at the Marine Corps Recruit Depots located at Parris Island and San Diego were enrolled in the study. Recruits performed CMJ and IMTP tests at the onset of training. Injury data were collected via medical chart review. Combat fitness test (CFT) and physical fitness test (PFT) results were provided to the study team by the USMC. A k-means cluster analysis was performed on CMJ relative peak power, IMTP relative peak force, and dynamic strength index. Independent sample t-tests and Cohen's d effect sizes assessed between-cluster differences in CFT and PFT performance. Differences in cumulative incidence of lower extremity %MSKIs were analyzed using Fisher's exact test. Relative risk and 95% confidence intervals (CIs) were also calculated. The overall effects of cluster designation on CMJ and IMTP outcomes ranged from moderate (relative peak power: d = -0.68, 95% CI, -0.85 to -0.51) to large (relative peak force: d = -1.69, 95% CI, -1.88 to -1.49; dynamic strength index: d = 1.20, 95% CI, 1.02-1.38), indicating acceptable k-means cluster partitioning. Independent sample t-tests revealed that both men and women in cluster 2 (C2) significantly outperformed those in cluster 1 (C1) in all events of the CFT and PFT (P < .05). The overall and within-gender effect of cluster designation on both CFT and PFT performance ranged from small (d > 0.2) to moderate (d > 0.5). Men in C2, the high-performing cluster, demonstrated a significantly lower incidence of ankle MSKI (P = .04, RR = 0.2, 95% CI, 0.1-1.0). No other between-cluster differences in MSKI were statistically significant. Our results indicate that strength and power metrics derived from force plate tests effectively partition USMC male and female recruits into distinct performance clusters with relevance to tactical and physical fitness using k-means clustering. These data support the potential for expanded use of force plates in assessing readiness in a cohort of men and women entering USMC recruit training. The ability to pre-emptively identify high and low performers in the CFT and PFT can aid in leadership developing frameworks for tailoring training to enhance combat and physical fitness with benchmark values of strength and power.

Physical fitness test performance in firefighter trainees: Differences between graduated and released trainees and predicting academy graduation.

Fitness tests have been previously used to predict academy graduation and highlight specific capacities to be targeted in applicants/trainees to optimise their potential for academy success. To compare the fitness of graduated and released (did not complete academy requirements) firefighter trainees and explore using decision tree analysis to predict academy graduation via fitness tests. Retrospective analysis was conducted on 686 trainees who completed an occupational physical ability test (OPAT): Illinois agility test; push-ups; pull-ups; leg tucks; estimated maximal aerobic capacity (VO2max); backwards overhead 4.54-kg medicine ball throw; 10-repetition maximum deadlift; and 91.44-m farmer's carry. Data were recorded in raw and scaled scores (tests scored from 0-100; maximum OPAT score was 800). Trainees were split into 'graduated' (GRAD; n = 576) or 'released' (REL; n = 110) groups. Mann-Whitney U-tests compared between-group OPAT scores. A decision tree analysis using Chi-square automatic interaction detection was conducted, with raw and scaled scores entered into the analysis. A separate analysis was conducted with only the raw scores. GRAD trainees outperformed REL trainees in all OPAT events (p < 0.001). OPAT total score was the best predictor of academy graduation (p < 0.001), followed by the deadlift score (p = 0.003). Estimated VO2max was the only significant raw score predictor (p < 0.001). GRAD trainees were fitter than the REL trainees. Fitness could predict trainees who graduated from the academy. Overall fitness (OPAT total score), muscular strength (deadlift) and aerobic capacity were important graduation predictors. Training staff could develop these fitness qualities in their trainees to potentially improve fire academy graduation rates.

Perspective: Improving police recruitment outcomes for women through physical fitness support programs

Abstract This perspective paper is anchored in the authors’ direct experiences with enhancing women’s recruitment in law enforcement through physical fitness programs and mentoring in Newark, NJ. The paper draws insights from a successful approach that boosted women’s performance in physical fitness tests (PFTs). The paper underscores the importance of gender inclusivity in police recruitment, detailing the implementation of the Women’s Leadership Academy (WLA) and its evolution into the nationwide 30x30 initiative. Key findings reveal that tailored physical training, effective mentoring, and support can significantly lower attrition and enhance gender diversity in policing. Recommendations for law enforcement agencies include adopting equitable PFT standards, establishing mentoring programs for women, and revising recruitment policies to align with current research and best practices. This paper also advocates for a paradigm shift towards comprehensive strategies that build an organizational culture of diversity and equality, specifically through initiatives aimed at enhancing women’s representation in policing with focussed physical fitness training and acclimatization.

Injuries and Factors Associated with Injuries Among U.S. Army Band Musicians.

An electronic survey was administered to active-duty U.S. Army Band musicians. The survey collected demographics, personal characteristics, Army Physical Fitness Test performance, occupational demands, health behaviors, and injuries from October 2017 to December 2018. Survey responses were combined with medical and physical fitness performance records. Descriptive statistics were reported and factors associated with injuries were investigated. There were 465 Army Band members in this population, with approximately half (49%) completing the survey. Most survey respondents (81%) reported an injury in the past year, which they predominantly attributed to overuse (54%). Leading reported activities resulting in injury included running for physical training (21%), repetitive movements while playing an instrument (11%), and standing while playing (11%). A majority of survey respondents (60%) also had a medical encounter for an injury. Factors significantly associated with injury among men were lower aerobic fitness and higher body fat percentage; additional unadjusted factors associated with injury among all Army Band soldiers included female sex, older age, and longer periods of marching and standing while playing. Injury prevention initiatives for Army Band musicians should focus on the reduction of overuse and repetitive motion injuries. Suggested prevention strategies include balanced physical training, ergonomic adjustments, rehearsal breaks, and leadership support for injury prevention efforts.

Comparative study of functional indicators in swimming and volleyball

This study aimed to identify various functional indicators relevant to swimming clubs and volleyball players, and also to compare selected functional indicators between athletes engaged in swimming and volleyball. The researchers employed the descriptive method within the framework of comparative studies. The study sample comprised applicants from clubs in Baghdad, deliberately chosen to represent the pinnacle of swimming proficiency and volleyball efficiency. Each category, swimming and volleyball, consisted of 22 subjects, divided evenly into two groups, with 11 subjects in each. Functional tests utilized in this study included the heart rate test and the physical fitness test known as PWC170. There exists a notable disparity in resting heart rate between swimmers and volleyball players. While some alignment is observed in individual heart rates between the two sports, significant differences persist. Furthermore, substantial disparities in physical fitness test results, particularly the PWC170 test, are evident, with volleyball players demonstrating a six-level advantage over swimmers. Additionally, there are instances of exceptionally high PWC170 levels among swimmers, albeit in a minority of cases. There is a discernible discrepancy of eight degrees in maximum oxygen consumption (Vo2max) rates favoring volleyball players. Lastly, the Hb test results for swimmers are significantly influenced by their performance in physical fitness tests and maximum oxygen consumption, leading to a clear advantage for volleyball players in this assessment.

The Functional Movement Screen andSelf-reported Injury inSenior Military College Cadets.

Secular trend of increasing musculoskeletal injuries (MSKIs) across all branches of the U.S. Military is a critical limiting factor in the effective and efficient process of preparing military personnel for combat. The need to evaluate functional capacity beyond current physical fitness test (PFT) standards is the key in understanding an individual's risk of noncombat-related injury. The purpose of this study is to evaluate the relationship between Functional Movement ScreenTM (FMS) scores, incidence of musculoskeletal injuries, and standardized PFT scores among freshman Cadets during their first 10 weeks of enrollment at a senior military college. Eighty-two participants (72 male and 10 female participants; mage: 18.2 years) completed the FMS, an institution-specific PFT (2-min maximum pushups, 2-min maximum abdominal crunches, and 1.5 mile timed run), and an Incidence of Injury and Incidence of Pain Questionnaire. Independent t-tests, Spearman's rank correlation coefficients logistic regression analysis, and Receiver Operator Curves were performed to evaluate relationships between the study variables. FMS composite and PFT sex-normed total scores were higher in females (16.4, 236.1) than in males (15.0, 204.9). Ninety percent of all females reported injury or pain during the 10-week survey period compared to 48% of males. No significant difference between FMS scores and injury and pain was found within both sex groups. Therefore, use of the composite FMS score as an indicator for risk of injury or to predetermine PFT performance is not recommended for this study's population. The rate of incidence of injury or pain in Cadets during a 10-week enrolment period is high. Females outperformed males in the FMS and PFT and reported higher rates of injury and pain. The utility of the FMS may be limited when substantially scaled for implementation across entire military populations. Future research should evaluate performance associations of the FMS with Army Combat Fitness Test components in a population of equally distributed sex and race.

Aptidão física de acordo com o nível de atividade física em pessoas idosas: uma análise transversal

Abstract Introduction Aging is marked by physiological changes and a decrease in physical activity. These aspects can have repercussions, namely declining functionality and increasing likelihood of adverse events. Objective To compare performance in physical fitness tests of sufficiently and insufficiently active older people. Methods Epidemiological population study, cross-sectional, carried out with 209 older people (58.4% women) from Aiquara/BA. Sociodemographic information was obtained by means of interviews. Physical fitness was measured by means of the following tests: handgrip strength, chair stand, arm curl, timed up and go, sit and reach and step in place. The level of physical activity was checked by the International Physical Activity Questionnaire (&lt;150 min/week physical activity = insufficiently active). Comparisons were made using the Student t-test or Mann-Whitney U-test, according to the distribution of normality determined by the Kolmogorov-Smirnov test (p ≤ 0.05). Results We found that 51.70% of the participants were insufficiently active (men: 66.66%; women: 40.98%). In addition, insufficiently active participants of both sexes performed less well in the handgrip strength, chair stand, arm curl, timed up and go and step in place tests (p &lt; 0.05). Moreover, insufficiently active men showed lower performance in the sit and reach test than sufficiently active men (p &lt; 0.05). Conclusion Insufficiently active older women and men have lower muscle strength/resistance, dynamic balance/agility and cardiorespiratory endurance. Furthermore, insufficiently active men show less flexibility than those sufficiently active.

Health Related Fitness Physical Education Intervention: Self-Determination Perspective

Introduction: The purpose of this study was to investigate the effect of 8-week health-related physical education (HRFPE) intervention on 9th-grade students' health-related fitness knowledge (HRFK) level, physical activity level (PAL), and physical fitness levels. Methods: Experimental research with two groups, HRFPE, and skill-based physical education, with 154 students, was measured before and after the intervention. While the experimental group attended the HRFPE intervention, the comparison group attended the skill-based physical education intervention. Quantitative data were gathered from Health-Related Fitness Knowledge Test (HRFKT), International Physical Activity Questionnaire for Adolescents (IPAQ-A), and Fitnessgram tests (Left &amp; right leg Flexibility, Push-up, Pacer, Curl-up, and BMI). Data gathered from HRFKT, and IPAQ-A were analyzed by mixed-design multivariate analysis of variance (MANOVA). Data from Fitnessgram tests were analyzed by mixed-design analysis of variance (ANOVA). Results: The knowledge test results revealed a significant effect of HRFPE intervention on students' cardiorespiratory fitness, muscular endurance, training principles, and general health knowledge parameters of HRFKT. The intervention significantly increased the low and vigorous PAL of participants. The HRFPE intervention positively affected right leg flexibility, pacer cardiovascular, curl-up muscular endurance, and BMI. Results demonstrated the effect of self-determination theory based HRFPE intervention on developing students' HRFK level, physical activity behavior, and physical fitness test performances. Conclusions: This study revealed that physical education teachers could design and implement HRFPE course interventions in real school settings. Further recommendations were discussed regarding the content and implementation of intervention for physical education teachers, curriculum specialists, and future studies.

Career-Best Changes in Body Mass and Physical Fitness Test Performance Among Division 1 College Football Players Encompassing 28 Years at the Same Institution.

Baur, DA, Johnson, JB, Giron-Molina, LG, Caterisano, M, Shaner, C, Caterisano, A, and Gentry, M. Career-best changes in body mass and physical fitness test performance among Division 1 college football players encompassing 28 years at the same institution. J Strength Cond Res 37(4): 806-815, 2023-Understanding typical changes induced by collegiate American football strength and conditioning programs is essential for optimizing program design and athletic development. The purpose of the study was to evaluate body mass and physical fitness test performance changes at a Division 1 program with 28 years of coaching stability. Initial and personal record results were collected from 1,102 players who were subdivided into 3 position groups: combination players (COMBO), skill players (SKILL), and line of scrimmage players. Players followed a linear periodized training program with biannual body mass and performance testing. Tested variables included body mass, strength (bench press, back squat, and front squat), impulse (power clean, push jerk, and vertical jump [VJ]), and speed/agility (10-yard dash [10YD], 40-yard dash, and 20-yard shuttle). The fixed effect of time and position group on the dependent variables was assessed using linear mixed models. If appropriate, post hoc tests using the estimated marginal means were used to evaluate the source of any significant effects. Significance was accepted as p < 0.05. Normative values were produced by descriptive statistics (i.e., weighted means). All players and position groups increased/improved across all tested variables ( p < 0.05). Improvements were 8.2%, 11.9-18.3%, 13.5-17.5%, and 3.6-6.0% for body mass, strength, impulse, and speed/agility, respectively. Line of scrimmage improvements were absolutely larger across most tested variables and relatively larger for back squat, VJ, and 10YD vs. SKILL and with VJ vs. COMBO/SKILL ( p < 0.05). These results reveal typical expectations for 4-5 years performance improvements and that position group differences in trainability may influence game readiness and training needs.

Video Call-based Fitness Assessment shows Poor Fitness in People with Type II Diabetes: Findings from Diabefly Digital Therapeutics Program.

Exercise and physical activity are integral aspects for the effective management of diabetes. Unsupervised home exercise although very accessible is limited by poor adherence, risk of injury, and a higher dropout rate of participants. A fitness assessment by a qualified physiotherapist can help in understanding the baseline fitness of individuals and thus generating appropriate exercise prescriptions. The current study assesses the feasibility of video call-based fitness assessment for people with diabetes. The study also assesses the effect of current physical activity status and pain on performance in physical fitness tests. One hundred participants with type II diabetes (T2D) underwent 6-minute walk test (6MWT), 1-minute push-up test, wall sit test, 1-minute sit-up test, and V-sit and reach test for measuring different components of physical fitness such as aerobic capacity, upper body strength, lower body strength, core strength, and flexibility, respectively. The performance in physical fitness of participants was analyzed after the video consult along with pain complaints and current exercise status. All the participants underwent the physical fitness test safely based on video call. Out of all the participants, a good range score was achieved by 52% in 6MWT, 17% in push-up test, 1% in wall sit test, 6% in sit-up test, and 9% in V-sit and reach test. Current physical activity status (aerobic exercise for minimum 20 minutes) did not show any association with performance in fitness tests (p = 0.89 for push-up test, p = 0.50 for wall sit test, p = 0.23 for sit-up test, and p = 0.10 for V-sit and reach test). Presence of upper body and lower body pain affected the performance in push-up test and wall sit test with 71.4% and 95.6% of participants achieving scores in poor to below-average range (p-value &lt; 0.001). The study showed the safety and feasibility of conducting video call-based assessment of physical fitness by physiotherapists. The study also highlighted the poor glycemic control, high cardiovascular risk, and poor level of physical fitness in people with diabetes in India. Insights based on physical fitness, current physical activity status, and pain can help in developing personalized exercise plans for people with diabetes.

Influence of Digit Ratio (2D:4D) on Aerobic and Anaerobic Based Fitness Tests among Primary Schoolchildren

As digit ratio (2D:4D) factor corresponds with high level of performances, fine-tune skills and immense ability were evidently found, but however the impact of 2D:4D on aerobic and anaerobic fitness components among younger subjects has yet to be fully understood. Thus, the main objective of this study is to examine the role of 2D:4D towards performance in physical fitness tests comprising of both aerobic-based and anaerobic-based elements. Results were collected from six physical fitness tests involving 594 primary schoolchildren (aged 10 to 12 years old) of both genders. Fingers images were taken through hand scanning method and the ratios were measured and calculated. Priorly, effect of covariances (age and body mass index) was found to have no effect on the fitness tests. For male students, the low 2D:4D of both hands showed various significant relationship with non-anaerobic based tests acquiring lower R2 below 10%. Both genders reported to have higher percentage of variability of dependant variables detected at anaerobic based tests with the highest was found at standing broad jump test. Meanwhile, for the female subjects mixed results were found with all aerobic based tests scored lower R2 below 10%. Overall, low digit ratio was much prominent in anaerobic-based tests in both male and female subjects. This study suggests that 2D:4D thrives more in anaerobic based events/tests among younger subjects and with thorough research, it is possible to implement 2D:4D as additional instrument in identifying sports talents and categorizing potential athletes according to the related fitness components.

Influence of Maturity Status on Kinanthropometric and Physical Fitness Variables in Adolescent Female Volleyball Players

The aim of this research was to analyze differences in kinanthropometric characteristics and physical performance in relation to maturity status, as well as to determine if age, maturity offset or kinanthropometric variables could predict better performance in physical fitness tests. A total of 152 female volleyball players (14.16 ± 1.25 years old) underwent a kinanthropometric assessment, followed by a physical fitness assessment composed of different tests. The age at peak height velocity (APHV) was calculated, and the sample was divided according to biological maturation into three groups. Significant differences were observed in kinanthropometric variables (p &lt; 0.001–0.026), with early maturers showing higher values. Age, body mass, Cormic index, relative arm span, ∑8 skinfolds, fat mass, corrected arm and thigh girths, muscle mass and biacromial and biiliocristal breadths were the variables that best predicted performance in the physical tests (p &lt; 0.001–0.024). The more mature players showed higher values in most of the kinanthropometric variables, with the more remarkable differences being in body mass, height, arm span and sitting height, and those related to adiposity and absolute body composition, and with structural variables being the most influential on the physical tests. Age had a determinant influence on the differences found between groups in strength and power-related test performance.

Influence of biological maturation status on selected anthropometric and physical fitness variables in adolescent male volleyball players.

BackgroundThe identification of sport talent among adolescent athletes is a topic that in recent years has been a major focus of interest for both the scientific community and sport managers. Both anthropometry and physical performance through fitness tests have demonstrated to be key elements. Biological maturation, due to its influence on anthropometric variables and physical fitness, has also been studied in relation to sport talent identification.ObjectiveTo analyse differences according to biological maturation status in anthropometric characteristics and performance in physical fitness tests, and to determine which variables predict better performance in physical fitness tests in adolescent volleyball players.MethodsA cross-sectional design was followed to collect the data. A total of 48 male sub-elite volleyball players (14.17 ± 0.73 years) completed a socio-demographic and sports ad hoc questionnaire. Anthropometric variables were measured following the guidelines of the International Society for the Advancement in Kinanthropometry (ISAK) including four basic measurements (body mass, height, sitting height and arm span); eight skinfolds (triceps, biceps, subscapular, iliac crest, supraspinale, abdominal, thigh and calf); four girths (arm relaxed, flexed and tensed arm, middle thigh and calf); five breadths (biacromial, biileocrestal, humerus, femur and bi-styloid); three lengths (acromiale-radiale, radiale-stylion and stylion-medio dactilion); and a height (ilioespinale). Physical fitness was assessed, including the sit-and-reach, back scratch, long jump, medicine ball throw, counter movement jump (CMJ), 20 meters sprint, and agility tests. Furthermore, maturity offset and age at peak height velocity (APHV) was calculated.ResultsSignificant differences were found in the body mass (Mean Difference, MD = 20.86–30.75), height (MD = 11.72–19.09), sitting height (MD = 4.27–10.27), arm span (MD = 12.91–20.78), body mass index (MD = 3.72–5.63), upper limb length (MD = 7.76), corrected muscle girths (MD = 2.06–9.31), ∑6 and 8 skinfolds (MD = 3.67–50.21) fat mass and percentage (MD = 0.30–11.58), muscle (MD = 4.13–10.64) and bone mass (MD = 1.61–3.54) (p < 0.001–0.030), showing higher values the early maturers. In the physical fitness tests, significant differences were observed in the medicine ball throw (MD = 1.26–2.80) and in CMJ power (MD = 156.71–379.85) (p < 0.001). Regression models identified fat mass percentage predicted worse physical test performance (p < 0.001), while age, maturation offset, muscle and bone variables were predictors of better physical performance (p < 0.001).ConclusionsSignificant differences based upon the stages of biological maturation were found in the anthropometric and physical condition variables in favor of the players whose maturation process was more advanced, with the variables related to fat and adipose, muscle and bone development conditioning their performance in the physical condition tests.

Can Physical Fitness Performance be Used to Predict the BMI Status of First-Year Students? A Case Study from a University I n Southern Taiwan

This study aims to investigate the relationship between the physical fitness performance of college freshmen and the BMI body weight status (normal/ abnormal). We conducted case studies and obtained data on 7,160 participants aged 18 years from a university in southern Taiwan. All participants completed four physical fitness tests (seated forward bench, standing long jump, sit-ups, and cardiorespiratory endurance) and BMI assessments with the professional assistance of PE teachers. BMI is used to define the normal and abnormal state of body weight. Logistic regression analysis was used in this study. The results show that the four physical fitness tests currently implemented in college physical education can be used to predict whether the weight of the freshmen is normal. Cardiorespiratory endurance seems to be the most important feature for predicting the type of BMI (normal/abnormal), whether male or female. When the "cardiorespiratory endurance" of freshman students increases by a category, the probability of males belonging to the healthy weight category increases by 4.879 times, and the probability of females increases by 2.927 times. This study provides a new perspective for predicting whether the freshman's body weight is normal or not by using different types of college physical fitness test performance.

Application Analysis of Physical Fitness Test Performance Management Based on Improved Ant Colony Algorithm

Objectives: With the continuous development of quality education in China, higher education pays more and more attention to the development of physical education. However, in the process of China’s development, there is a lack of corresponding evaluation system for physical fitness test results. Methods: Therefore, this paper proposes the analysis and research application of fitness test performance management based on ant colony algorithm. Firstly, it expounds the development status of physical education performance management. Results: Then, aiming at the corresponding shortcomings, this paper puts forward the application analysis of the fitness test performance management platform based on the mixed mode of cloud theory, and carries out a series of comprehensive tests on the system. Conclusion: According to the performance test of all aspects of the database, the test results show that the system is feasible.

Selected, Deselected, and Reselected: A Case Study Analysis of Attributes Associated With Player Reselection Following Closure of a Youth Soccer Academy.

Considering the perceived benefit of early recruitment and the time and resources spent developing youth players, individuals released from talent development programmes are often re-recruited by rival academies. However, due to the contractual nature of many talent development programmes, limited empirical data exists on players deselected from (or reselected to) youth soccer academies. Adopting a novel case study approach, differences in skill, psychological, and physical attributes associated with reselection following closure of a junior-elite soccer academy were explored. Overall subjective coach ratings for skill, psychological, and physical abilities; subjective coach ratings for skill and psychological attributes; and physical fitness test performance of 79 junior-elite soccer players (U11–U17) were assessed as part of regular scheduled testing and monitoring practices prior to the academy closure. Reselection status was monitored and recorded for all players in the 6 months following the academy closure and was classified as a persistence/progression (“Reselected”) or attrition (“Deselected”) in playing level. Of the 79 released players, a total of 60 players (76%) were re-signed to a junior-elite academy within 6 months. Differences were observed for overall ratings of skill, psychological, and physical abilities in favor of the “Reselected” player group. “Reselected” players were also rated higher by coaches for all attributes categorized as skill and psychological, as well as performing better at all physical fitness tests. However, “Reselected” players were lesser in stature and body mass and less mature than “Deselected” players. Our findings suggest that reselection is not a product of anthropometric criteria and, therefore, a pathway for selection remains open for later maturing players. We also inform upon desirable qualities associated with player reselection and provide a case study approach of a unique, yet highly relevant, scenario for talent identification and development in youth soccer.

Skeletal Muscle Mass and Fat Mass Relationships With Physical Fitness Test Performance in Law Enforcement Recruits Before Academy.

Lockie, RG, Carlock, BN, Ruvalcaba, TJ, Dulla, JM, Orr, RM, Dawes, JJ, and McGuire, MB. Skeletal muscle mass and fat mass relationships with physical fitness test performance in law enforcement recruits before academy. J Strength Cond Res 35(5): 1287-1295, 2021-The purpose of this study was to analyze relationships between skeletal muscle mass percentage (SMM%) and fat mass percentage (FM%) relative to fitness test performance in law enforcement recruits. Retrospective analysis was conducted on 338 recruits (271 men and 67 women) from 4 academy classes. Skeletal muscle mass percentage and FM% were measured using cost-effective and practical bioelectrical impedance analysis (BIA) equipment that used hand and foot placement. The fitness tests included grip strength; vertical jump; 75-yard pursuit run; 2-kg medicine ball throw (MBT); push-ups and sit-ups completed in 60 seconds; and the 20-m multistage fitness test. Partial correlations controlling for sex-derived relationships between SMM%, FM%, and the tests. Recruits were split into quartile groups for SMM% and FM% (group 1 had the lowest SMM% or highest FM% and group 4 the highest SMM% or lowest FM%). A 1-way multivariate analysis of variance (MANOVA), with sex as a covariate and Bonferroni post-hoc, compared between-group results. Skeletal muscle mass percentage correlated with all fitness tests expect for MBT; FM% with all but grip strength and MBT (r = ±0.107-0.293). Greater SMM% or lesser FM% tended to relate to better fitness test performance. The MANOVA data indicated groups 3 and 4 (better SMM% or FM% profiles) exhibited superior fitness than group 1 (poorest SMM% or FM% profile) (p ≤ 0.048). Recruits should ideally increase SMM% and decrease FM% before academy to optimize fitness training and testing performance, although specific guidelines should be agency specific. Staff could use BIA to monitor body composition during academy to indicate how recruits are tolerating training.

Physical, psychological and demographic factors associated with military discharge: a systematic review

Abstract Aims: The present study is a review focused on analyzing the physical, psychological, and demographic factors that lead recruits to be dismissed or to request their dismissal during basic military training periods. Methods: This study is a systematic review of cohort studies. The following databases were searched in June 2019 and updated in July 2020: Embase, LILACS, CINAHL, Cochrane, MEDLINE, SCOPUS, SPORTDiscus, Web of Science, and Science Direct databases. The MeSH descriptors military personnel, risk factors, and discharge were used to elaborate the search equations. Reference lists were explored to find studies that examined the association between physical, psychological, and demographic factors that lead recruits to be discharged. The following data were extracted from the studies: profile of the participants, sample size, type of risk factors, the duration of follow-up, and the results of the statistical analysis carried out in the studies included. The risk of bias was analyzed with the Newcastle-Ottawa Scale for cohort studies. Results: A total of 531 titles were retrieved from the databases, and eight articles met the eligibility criteria. The results showed the factors associated with discharge, in descending order: musculoskeletal injuries and other medical questions, depressive and behavioural disorders, performance in physical fitness tests, and others. Factors such as educational level, alcohol use, history of suicide attempt, and imprisonments were not associated with an increased risk of being discharged. Conclusion: Musculoskeletal injuries, depression, running performance, previous physical exercise practice, and demographic factors were associated with an increased risk of being discharged.

Effects of Whey and Pea Protein Supplementation on Post-Eccentric Exercise Muscle Damage: A Randomized Trial.

This randomized trial compared pea protein, whey protein, and water-only supplementation on muscle damage, inflammation, delayed onset of muscle soreness (DOMS), and physical fitness test performance during a 5-day period after a 90-min eccentric exercise bout in non-athletic non-obese males (n = 92, ages 18–55 years). The two protein sources (0.9 g protein/kg divided into three doses/day) were administered under double blind procedures. The eccentric exercise protocol induced significant muscle damage and soreness, and reduced bench press and 30-s Wingate performance. Whey protein supplementation significantly attenuated post-exercise blood levels for biomarkers of muscle damage compared to water-only, with large effect sizes for creatine kinase and myoglobin during the fourth and fifth days of recovery (Cohen’s d > 0.80); pea protein versus water supplementation had an intermediate non-significant effect (Cohen’s d < 0.50); and no significant differences between whey and pea protein were found. Whey and pea protein compared to water supplementation had no significant effects on post-exercise DOMS and the fitness tests. In conclusion, high intake of whey protein for 5 days after intensive eccentric exercise mitigated the efflux of muscle damage biomarkers, with the intake of pea protein having an intermediate effect.

Genetics of somatotype and physical fitness in children and adolescents.

To analyze the influence of genetic and environmental factors on the variation in somatotype, physical fitness, and their mutual associations. Twins from 214 pairs (87 monozygotic) of the Autonomous Region of Madeira, Portugal, from 3 to 18 years of age (51% girls) were assessed in anthropometry and physical fitness tests. We estimated endomorphy, mesomorphy, and ectomorphy based on anthropometric measures and physical fitness using the Eurofit test battery. Two age categories were analyzed: children (3-11 years) and adolescents (12-18 years). Genetic and environmental variations were estimated using quantitative genetic twin modeling. No genetic sex differences were found, thus boys and girls were pooled in all genetic analyses. Heritability estimates were high for somatotype (a2 =0.80-0.93), physical fitness traits (a2 =0.67-0.83), and largely similar in children and adolescents. Positive correlations were found for ectomorphy with motor ability and cardiorespiratory endurance as well as for endomorphy and mesomorphy with muscular strength (r=0.25-0.37). In contrast, negative associations were found for ectomorphy with muscular strength, as well as for endomorphy and mesomorphy with motor ability and cardiorespiratory endurance (-0.46 to -0.26). Twin modeling indicated that these associations were explained mostly by genetic factors in common to the two associated traits (84% or more). Associations between somatotype and physical fitness tests are mainly explained by common genetic background in children and adolescents. Therefore, interventions in youth should consider that a child's performance in physical fitness tests partly reflects their inherited physique.