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Sofia Wolker Manta, Kelly Samara da Silva, Giovani Firpo Del Duca, Luís Eduardo A. Malheiros, Margarethe Thaisi Garro Knebel, Andressa Ferreira da Silva and Thiago Sousa Matias

Background: Income is an important determinant of physical activity (PA) when analyzed in its different domains. Sociodemographic characteristics such as sex, age, education, and marital status reveal distinct population profiles when PA domains are analyzed in isolation. This study aimed to describe clusters of PA in domains within income inequalities and to investigate the associated sociodemographic characteristics of Brazilian adults. Methods: A secondary analysis of the National Health Survey was performed (N = 50,176). PA, sociodemographic characteristics, and family income were investigated. Low- (n = 9504) and high-income adults (n = 6330) were analyzed. Two-step cluster and Rao–Scott chi-square tests were employed. Results: High-income adults accumulated 1.06 times more PA in leisure time compared with low-income adults. Of the 3 clusters observed, the inactive cluster was more prevalent (low-income group: 65.9%; 95% confidence interval [CI], 64.1–67.5; high-income group: 84.5%; 95% CI, 82.9–86.0). Work/leisure activities (21.2%; 95% CI, 19.8–22.8) and commuting/household activities (12.9%; 95% CI, 11.8–14.1) characterized low-income adults. Work/household activities (10.9%; 95% CI, 9.6–12.3) and commuting/leisure activities (4.6%, 95% CI, 3.9–5.4) characterized high-income adults. Sex (P < .001), age (P < .001), and marital status (P = .0023) were associated with low-income clusters. Conclusion: PA clustering differs within income inequalities. PA in leisure differentiates the opportunities in low- and high-income groups, but it is representative of a very small portion of the wealth.

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Timothy W. Cacciatore, Patrick M. Johnson and Rajal G. Cohen

The Alexander technique (AT) has been practiced for over 125 years. Despite evidence of its clinical utility, a clear explanation of how AT works is lacking, as the foundational science needed to test the underlying ideas has only recently become available. The authors propose that the core changes brought about by Alexander training are improvements in the adaptivity and distribution of postural tone, along with changes in body schema, and that these changes underlie many of the reported benefits. They suggest that AT alters tone and body schema via spatial attention and executive processes, which in turn affect low-level motor elements. To engage these pathways, AT strategically engages attention, intention, and inhibition, along with haptic communication. The uniqueness of the approach comes from the way these elements are woven together. Evidence for the contribution of these elements is discussed, drawing on direct studies of AT and other relevant modern scientific literature.

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John J. McMahon, Jason P. Lake, Nicholas J. Ripley and Paul Comfort

The purpose of this study was to determine the usefulness of calculating jump take-off momentum in rugby league (RL) by exploring its relationship with sprint momentum, due to the latter being an important attribute of this sport. Twenty-five male RL players performed 3 maximal-effort countermovement jumps on a force platform and 3 maximal effort 20-m sprints (with split times recorded). Jump take-off momentum and sprint momentum (between 0 and 5, 5 and 10, and 10 and 20 m) were calculated (mass multiplied by velocity) and their relationship determined. There was a very large positive relationship between both jump take-off and 0- to 5-m sprint momentum (r = .781, P < .001) and jump take-off and 5- to 10-m sprint momentum (r = .878, P < .001). There was a nearly perfect positive relationship between jump take-off and 10- to 20-m sprint momentum (r = .920, P < .001). Jump take-off and sprint momentum demonstrated good–excellent reliability and very large–nearly perfect associations (61%–85% common variance) in an RL cohort, enabling prediction equations to be created. Thus, it may be practically useful to calculate jump take-off momentum as part of routine countermovement jump testing of RL players and other collision-sport athletes to enable the indirect monitoring of sprint momentum.

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Bethany L. Anderson, Rod A. Harter and James L. Farnsworth II

Clinical Scenario: Dynamic stretching and foam rolling are commonly used by athletes to reduce injury and enhance recovery, thereby improving athletic performance. In contrast to dynamic stretching, little research has been conducted on the acute effects of foam rolling as part of the preexercise warm-up routine. Previously, when researchers implemented foam rolling with static stretching as a warm-up, some found that foam rolling slightly improved flexibility and performance outcomes. More recent research has shown that dynamic stretching is favorable to static stretching when used as a warm-up strategy. Therefore, adding foam rolling to dynamic stretching is hypothesized to create more significant improvements in flexibility and performance compared with adding foam rolling to static stretching. Focused Clinical Question: In active individuals, does foam rolling in addition to dynamic stretching lead to enhanced performance compared with dynamic stretching alone? Summary of Key Findings: Four randomized controlled trials were included. Two studies concluded that the addition of foam rolling to dynamic stretching increased vertical jump height more than dynamic stretching alone, while 2 studies found no difference between these treatment groups. Two studies concluded that the addition of foam rolling increased agility performance compared with dynamic stretching alone, while one study found no difference between treatment groups and one study did not measure agility. All 4 studies reviewed concluded that foam rolling did not improve flexibility more than dynamic stretching alone. Clinical Bottom Line: Foam rolling in conjunction with dynamic stretching may further improve an athlete’s agility and power output; however, little improvement has been observed with foam rolling in regard to athlete flexibility when compared with completing dynamic stretching programs alone. Strength of Recommendation: Inconsistent findings from 4 randomized controlled trials suggest there is Grade C evidence to support the inclusion of foam rolling in a dynamic warm-up.

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Paige Guild, Monica R. Lininger and Meghan Warren

Clinical Scenario: Female college student-athletes (SA) often experience time loss from musculoskeletal injuries to the lower extremities. This can lead to lengthy rehabilitation, expensive medical bills, and declines in health-related quality of life. Identifying at-risk athletes prior to the start of an athletic season may allow coaches or athletic trainers to prescribe an injury prevention program. Clinical Question: In female college SA, are preseason single leg hop (SLH) scores associated with identifying those at risk for lower-extremity musculoskeletal injuries? Summary of Key Findings: Five prospective cohort studies in female SA scored athletes on the SLH prior to the start of the athletic sport season. One of 5 studies found an association of SLH with injury risk. An additional 2 studies found that the SLH as part of a battery of functional performance tests was associated with injury risk in some anatomic locations (eg, thigh/knee), but not overall injury risk. Clinical Bottom Line: Methodological limitations of the reviewed studies limits a final conclusion, and there is insufficient evidence to determine if the SLH should be used as a sole functional performance test to identify at-risk female SA; it may be useful as part of a battery of functional performance tests for female college SA. Strength of Recommendation: All studies were prospective cohort studies (level 3).

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Hairui Liu, Wei Wang, Chunhe Zhang and Peter A. Hastie

Purpose: The purpose of this study was to examine the effects of Play Practice (PP) instruction on badminton performance in college students. Method: A total of 66 students from the United States and China participated in units following either the principles of PP or skill-focused instruction. A nonequivalent control/comparison group experimental design with premeasure and postmeasure was used in this study. Separate analyses of variance with repeated measures (Time × Group) were conducted to examine the effects of PP and skill-focused instruction for each of the four dependent variables: (a) forehand clear, (b) wall volley, (c) game performance, and (d) tactical understanding. Results: Both PP and skill-focused instruction conditions were effective in improving participants’ skills from pretest to posttest. However, PP was also effective in improving participants’ game performance. Conclusion: PP effectively developed both fundamental skills and tactical aspects of badminton without diminishing the transfer effect from practice to games.

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Kellen Jamil Northcutt, Kayla Henderson and Kaylee Chicoski

The purpose of this study was to understand the symbolic messaging in hip-hop music as it relates to the lived experiences and realities of Black Americans in the United States. The study examined the song and music video titled “The Story of O.J.,” by hip-hop artist Jay-Z to gain a better understanding of how Jay-Z interpreted the impact of Black Americans’ lived experiences in the United States on their identity and ability to progress economically and socially, regardless of social standing, within subcultures such as sport. Employing a content analysis method, data were collected and analyzed using critical race theory. The results of the analysis of lyrical and video data identified three major themes: (a) battle with Blackness, (b) economic enslavement and financial freedom, and (c) systematic subjugation.

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Ke’La Porter, Carolina Quintana and Matthew Hoch

Clinical Scenario: Neurocognitive performance may put individuals at a greater risk for lower-extremity musculoskeletal injuries. Research has observed the relationship between lower-extremity musculoskeletal injury and baseline neurocognitive performance; however, the understanding of this relationship is lacking. Exploring this relationship may give further insight into musculoskeletal injury and provide innovative directions for musculoskeletal injury prevention. Clinical Question: Is there a relationship between neurocognitive performance and lower-extremity biomechanics during a jumping or cutting task in healthy adult athletes? Summary of Key Findings: The literature was searched for articles that examined the relationship of a baseline neurocognitive test and a biomechanical analysis following a sports-related task. A total of 3 cross-sectional articles were included. All 3 studies concluded that poorer neurocognitive performance was associated with biomechanical faults that are linked to increased risk or rate of lower-extremity musculoskeletal injury. Clinical Bottom Line: Based on the evidence included, there is a moderate-level evidence to support the relationship between neurocognition and lower-extremity biomechanics in healthy adult athletes. Strength of Recommendation: In accordance with the van Tulder approach, there is a moderate level of evidence due to consistent findings from a combination of high- and limited-quality articles.

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Risto Marttinen, Brianna Meza and Sara B. Flory

Purpose: The purpose of this study was to explore how a student-centered curriculum engaged participants in critical analysis of the “female ideal” and to identify perceived barriers to physical activity. Method: Participants were nine fifth and sixth grade Hispanic/Latina or mixed race girls, and two researchers at an urban elementary school in Southern California. Participants met one to two times per week in an after-school program. Data sources included researcher and participant journals, field notes, and semistructured interviews. Trustworthiness and credibility were established through prolonged engagement, member checks, and peer reviewer. Results: Two themes permeated the data. The first theme involved boys acting as a barrier to physical activity. The second theme involved alignment with the ideal female body. Discussion: This study highlights how boys still act as barriers to girls’ physical activity in many school settings, but also identifies how role models for girls have increased girls’ ability to critically examine media messages.