Purpose: This study aimed to determine the acute and chronic effects of interval aerobic exercise on hepcidin, ferritin, and liver enzymes in adolescents with beta-thalassemia major. Methods: Twenty-six beta-thalassemia major adolescents referred to the Thalassemia Clinic and Research Center were selected as study participants and randomly divided into control (n = 13) and training (n = 13) groups. Participants performed 3 sessions per week for 45 minutes in each session for 8 weeks of aerobic interval exercise with an intensity of 50% to 65% of the heart rate reserve. Blood samples were taken before, immediately after the exercise session, and 48 hours after the last training session, and liver enzymes aspartate aminotransferase, alanine aminotransferase (ALT), alkaline phosphatase (ALP), ferritin, and hepcidin were evaluated. Results : The results showed a decrease in aspartate aminotransferase, ALT, ALP, ferritin, and hepcidin levels due to 8 weeks of aerobic interval training (P = .14, P = .97, P = .03, P < .001, P < .001; respectively). Intergroup changes in all variables except ALT and hepcidin were significant (P < .05). Besides, acute aerobic exercise increased levels of aspartate aminotransferase, ALT, ferritin, and hepcidin (P = .04, P = .52, P < .001, P < .001; respectively), whereas ALP levels decreased (P < .001). In addition, changes in ALP and hepcidin levels were significant between the 2 groups (P = .05, P < .001; respectively). Conclusion : Based on the study’s results, it can be concluded that 8 weeks of aerobic interval training can decrease ferritin and hepcidin levels, but acute aerobic exercise increases them.
Acute and Chronic Effects of Interval Aerobic Exercise on Hepcidin, Ferritin, and Liver Enzymes in Adolescents With Beta-Thalassemia Major
Majid Mohabbat, Amir Hossein Barati, Azita Azarkeivan, Ehsan Eghbali, and Hamid Arazi
Age, Sex, and Training Specific Effects on Cross-Education Training
Aymen Ben Othman, Saman Hadjizadeh Anvar, José Carlos Aragão-Santos, Anis Chaouachi, and David G. Behm
An extensive number of publications have examined cross-education effects with adults, primarily investigating contralateral homologous (same) muscles. There are far fewer investigations on cross-education effects on contralateral heterologous (different) muscles and age (youth vs adult) and no studies investigating sex differences. Hence, the objective was to compare cross-education in female and male youth and young adults to contralateral homologous (chest press [CP], elbow flexors and extensors, handgrip isometric strength, and shot put) and heterologous (leg press, knee extension isometric strength, and countermovement jump) muscles. Twenty-eight female adults, 28 female youth, 28 male adults, and 28 male youth (total: 112) were examined before and after an 8-week (3 sessions/wk) unilateral, dominant arm, CP training program. Unilateral testing assessed dominant and nondominant leg press and CP 1-repetition maximum, knee extensors, elbow extensors, elbow flexors, and handgrip maximum voluntary isometric contraction (MVIC) strength, as well as shot put distance and countermovement jump height. Unilateral CP training induced training specific (CP 1-repetition maximum) and nonspecific (elbow extensors, elbow flexors, handgrip MVIC force, and shot put distance) improvements (P < .04, η 2: .45–.85) but no significant lower body improvements. There was evidence for testing limb specificity as the dominant arm provided significantly (P < .021, η 2: .17–.75) greater training gains than the nondominant arm. Youth’s training adaptations exceeded with unilateral CP 1-repetition maximum, elbow extensors MVIC force, and shot put distance (P < .049, η 2: .14–.49). No sex main effect differences were apparent. In conclusion, cross-education was training specific (greatest gains with upper body and dominant limbs) with greater benefits for youth and generally no sex differences with the exception of elbow extensors MVIC.
Associations of Outdoor Playtime With Ball Bouncing Skills: A Cross-Sectional Analysis Using the 2022 National Survey of Children’s Health
Ryan D. Burns, Anke Van Roy, and Bradley R. King
The purpose of this study was to examine the associations of outdoor playtime, screen time, and sleep duration with ball bouncing skills in a sample of 3- to 5-year-old children. Participants were young children (N = 11,121; 48.8% female) whose parent/guardian completed the 2022 National Survey of Children’s Health. The dependent variable was one item that asked about the child’s ability to bounce a ball repeatedly. The primary independent variables were the National Survey of Children’s Health items asking about hours of weekday and weekend outdoor play, screen time, and sleep duration. The primary analysis consisted of robust Poisson regression models to calculate adjusted prevalence ratios by regressing competent (high) ball bouncing skills with reported hours of weekday and weekend outdoor play, screen time, and sleep. After covariate adjustment, two or more hours spent in weekday outdoor play was associated with a 15%–41% higher prevalence of competent ball bouncing skills (p < .01), and three or more hours of weekend outdoor play was associated with a 14%–28% higher prevalence of competent ball bouncing skills (p < .05). More hours of outdoor play were associated with competency in ball bouncing skills in young children. Mechanisms for this association are unclear and warrant further investigation.
Effects of Foam Rolling Prior to Proprioceptive Neuromuscular Facilitation Stretching on Hamstring Flexibility and Thigh Skin Temperature
Sinem Yenil, Gamze Yalcinkaya Colak, and Seher Ozyurek
Context: Proprioceptive neuromuscular facilitation stretching (PNFS) is suggested to improve the range of motion and flexibility as an active warm-up. Recently, the foam rolling (FR) methods have also emerged as a passive warm-up. However, the combined effects of PNFS and FR are still unclear, and no reports have compared their effects using thermal imaging. This study investigated the acute effects of combining nonvibration FR (NVFR) and vibration FR (VFR) prior to PNFS, in comparison with PNFS alone, on hamstring flexibility and thigh skin temperature. Design: Randomized controlled trial. Methods: Participants (n = 60) were randomly assigned to PNFS, NVFR + PNFS, VFR + PNFS, and control group (CG). Active knee-extension (AKE), sit and reach (SR) test, and thermal imaging were evaluated before (pre-int), immediately after (post-int), and 30-minutes after (post30-int) intervention. Results: All intervention groups had a significant increase at all time periods (P < .001) except the CG in terms of AKE and sit and reach test (P > .05). Combined (NVFR + PNFS/VFR + PNFS) groups had also a significant increase in the post30-int compared with pre-int and post-int values of thigh skin temperature (P < .001). Combined groups, over time, had the best post30-int effect on increasing skin temperature. The study found a significant interaction effect between interventions and time across several measurements (P < .05). Combined groups showed more significant improvements in AKE compared to CG at post-int (P < .05). There is a similar change in AKE, SR test, and skin temperatures between combined groups and PNFS alone at both post-int and post30-int (P < .05). Conclusions: These findings indicate that using FR, with or without vibration, before PNFS does not provide an additional benefit in improving hamstring flexibility and thigh skin temperatures compared with PNFS alone.
Erratum. Sweat Mineral-Element Responses During 7 h of Exercise-Heat Stress
International Journal of Sport Nutrition and Exercise Metabolism
Gender Critical Feminism and Trans Tolerance in Sports
C.J. Jones
Through a systematic review of gender critical feminist rhetoric in the realm of sports, this article excavates a rhetorical strategy of what the author calls “trans tolerance,” a strategy that is at once trans-affirming and trans-exclusionary. The author argues that three themes run across three gender critical feminist organizations: (a) nonpartisanship, (b) biofeminism, and (c) trans tolerance. In a sports world that desperately needs transformation, scholars and activists alike must sharpen analyses of violent transphobic rhetoric in a way that moves beyond a “pro-trans versus anti-trans framework.”
Inside the Defensive Playbook: Pick-and-Roll Tactical Adjustments Impact the External and Internal Loads During Small-Sided Games in Female Basketball Players
Abdelaziz Qarouach, Pierpaolo Sansone, Marco Pernigoni, Rasa Kreivyte, and Daniele Conte
Purpose: This study aimed to assess the effect of playing different pick-and-roll (PnR) defensive tactical options during small-sided games (SSGs) on external and internal loads in female basketball players. Methods: Twelve female basketball players (age 28 [2] y; stature 175 [6] cm; body mass 65 [7] kg; playing experience 18 [4] y) belonging to a team competing in the Lithuanian second division were recruited for this study. Across 3 experimental sessions and in a randomized order, players performed 3 SSGs sharing the same features but using 3 defensive strategies on the middle PnR action: Switch, Trap, and Drop. External load was measured using PlayerLoad (PL); the number of accelerations, decelerations, and changes of direction, classified based on their intensities as low (<2.5 m·s−2), medium (2.5–3.5 m·s−2), and high (>3.5 m·s−2); and jumps categorized as low (<40 cm) and high (≥40 cm). Internal load was measured via rating of perceived exertion (RPE). Results: Higher PL values in SSGs including Trap defense were found compared with Drop (P < .001, ES = 0.69, moderate) and Switch (P = .001, ES = 0.60, moderate). Additionally, a higher number of accelerations was registered in Trap defense compared with Drop defense (P = .027, ES = 0.99, moderate). Trap defense also led to higher RPE compared with Switch (P = .003, ES = 1.49, large) and Drop (P = .004, ES = 1.42, large) defense. Conclusions: Different defensive strategies on the middle PnR can influence the external and internal loads during SSGs, and female basketball coaches should consider the high demand of the Trap defense when designing SSGs.
Optimal Support for Elite Sprinters Using a Minimal, Adequate, and Accurate Approach
Jad Adrian Washif and David B. Pyne
Background: In high-performance sport, the support provided by sport scientists and other staff can be a valuable resource for coaches and athletes. Purpose: We propose and detail here the approach of “minimal, adequate, and accurate” sport-science support to ensure that programs of work and solutions are both economical and effective. Methods: Our support provision advocates for utilization of “minimal” resources (employing the least amount of time, tools, and funding) necessary to achieve the desired outcomes. We strive for “adequate” information that fulfills specific objectives without excess and with the requirement that methods and data used are “accurate” (valid and reliable). To illustrate the principles of this approach, we outline a real-world example of supporting 100-m track (athletics) sprinters preparing and competing in an international competition. The provision of performance support emphasizes an integrated approach, combining knowledge and insights from multiple sport-science disciplines. The key facets managed under this approach are (1) neuromuscular readiness, (2) wellness monitoring, (3) movement observation, (4) motivation, (5) biomechanics and performance analysis, and (6) qualitative feedback. These facets are based on the specific performance determinants and influencing factors of an event (100-m dash). Conclusions: Application of this quantitative and qualitative approach can enhance the ability to make informed decisions. Nevertheless, the approach must be planned, evaluated, and refined on a regular basis to enable effective decision making in sport-science support. The 3-element approach of “minimal, adequate, and accurate” should be codesigned and supported by the athletes, coaches, and staff to ensure successful implementation.
Perceptions of Parents of Children With Disabilities Toward Physical Education: A Systematic Review
Adam S. Forbes, Fabián Arroyo-Rojas, and Martin E. Block
Physical education (PE) has a unique opportunity in not only supporting children with disabilities but also their parents’ physical-activity knowledge and support behaviors. Therefore, the purpose of this systematic literature review was to synthesize published studies regarding parent perspectives toward physical education (PE) for their children with disabilities. A total of 19 articles met inclusion criteria. Three themes emerged: (a) parents’ understanding of adapted PE (A/PE), (b) parents’ expectations of A/PE teachers, and (c) parents’ undeveloped relationships with A/PE teachers. There exists a disconnection between parent expectations and PE teachers’ abilities to accommodate their children and develop lines of communication. Additionally, parental value toward PE was often lower compared with other areas of need for their children. Future research suggests exploring teacher perspectives in understanding the relationships with parents. Furthermore, exploring the origins of parental values for PE and its impact on their perspectives warrants further investigation.
Physical Activity Predicts Better Lung Function in Children and Adolescents
Fernanda Balbinot and Margaret W. Gerbase
Purpose: To investigate (1) whether physical activity is associated with lung function in children and adolescents, (2) whether this association is modified by the subjects’ weight status, and (3) whether this association is mediated by the body mass index. Methods: This is a cross-sectional study including 460 participants aged 7–17 years, randomly selected from 13 public schools in southern Brazil. Collected data included anthropometric measures, physical activity, screen time, and spirometric measures expressed as percent predicted values. Data were analyzed using multiple linear regression and 2-way analysis of variance. Results: There were positive associations between physical activity and forced vital capacity (β = 3.897, P = .001) and forced expiratory volume in the first second (β = 2.931, P = .021). The effect modification by weight status was not statistically significant (forced vital capacity: P interaction = .296 and forced expiratory volume in the first second: P interaction = .057). Body mass index did not mediate the association between physical activity and spirometric outcomes (P > .05). Conclusion: Regular physical activity was associated with higher forced vital capacity and forced expiratory volume in the first second in children and adolescents. The observed associations were not modified by weight status nor mediated by body mass index. Our results reinforce the importance of regular physical activity for the development of lung function during childhood and adolescence.
