Background: Numerous studies have revealed the role of low dietary calcium-to-phosphorous ratio and low bone health. However, its possible role in visceral adiposity, skeletal muscle mass (SMM), and metabolic parameters has not been investigated before. Therefore, the aim of the current cross-sectional study was to evaluate the relation between dietary calcium-to-phosphorous ratio, metabolic risk factors, SMM, and visceral fat area (VFA) among physically active young individuals. Methods: In the current study, the sample was composed of 391 healthy young individuals (e.g., 205 men and 186 women), aged between 20 and 35 years old, who were engaged in moderate physical activity for at least 4 hr per week and were recruited thorough cluster sampling from seven sport clubs. Anthropometric measurements were performed, and VFA and SMM index (SMI) were calculated. Biochemical assays were also performed by standard kits. Data were analyzed by one-way analysis of variance, analysis of co-variance, and multinomial logistic regression analysis using SPSS software. Results: Those in the fourth quartile of dietary calcium-to-phosphorous ratio were more likely to have lower VFA (odds ratio [OR] = 0.98; 95% confidence interval [CI] [0.97, 0.99]; p = .023) and a nonsignificantly higher SMI (OR = 1.15; 95% CI [0.99, 1.34]; p = .058) after adjustment for the effects of confounders (e.g., age, gender, body mass index, physical activity level, dietary energy intake). Also, being in the third quartile of dietary calcium-to-phosphorous ratio made the subjects more susceptible to have lower insulin concentration (OR = 0.99; 95% CI [0.88, 0.93]; p = .026) in the adjusted model. Conclusion: The findings of the current study revealed that a higher dietary calcium-to-phosphorous ratio in the habitual diet was negatively associated with visceral adiposity and insulin concentrations and higher SMM among physically active young individuals. Further interventional studies are required to confer causality that was not inferable in the current study because of cross-sectional design.
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Dietary Calcium-to-Phosphorous Ratio, Metabolic Risk Factors and Lipid Accumulation Product, Skeletal Muscle Mass, and Visceral Fat Area Among Healthy Young Individuals
Xuanshang Jin, Xiangchuan Jin, Wen Guan, and Maolin Tang
Intrasession Caffeine Intake and Cycling Performance After Accumulated Work: A Field-Based Study
Iván R. Sánchez-Redondo, Lidia B. Alejo, Carlos Revuelta, Raúl de Pablos, María Ibañez, Alberto Pérez-López, Alejandro Lucia, David Barranco-Gil, and Pedro L. Valenzuela
Background: Preexercise caffeine intake has proven to exert ergogenic effects on cycling performance. However, whether these benefits are also observed under fatigue conditions remains largely unexplored. We aimed to assess the effect of caffeine ingested during prolonged cycling on subsequent time-trial performance in trained cyclists. Methods: The study followed a triple-blinded, randomized, placebo-controlled cross-over design. Eleven well-trained junior cyclists (17 ± 1 years) performed a field-based 8-min time trial under “fresh” conditions (i.e., after their usual warm-up) or after two work-matched steady-state cycling sessions (total energy expenditure∼20 kJ/kg and ∼100 min duration). During the latter sessions, participants consumed caffeine (3 mg/kg) or a placebo ∼60 min before the time trial. We assessed power output, heart rate, and rating of perceived exertion during the time trial and mood state (Brunel Mood Scale) before and after each session. Results: No significant condition effect was found for the mean power output attained during the time trial (365 ± 25, 369 ± 31, and 364 32 W for “fresh,” caffeine, and placebo condition, respectively; p = .669). Similar results were found for the mean heart rate (p = .100) and rating of perceived exertion (p = 1.000) during the time trial and for the different mood domains (all p > .1). Conclusions: Caffeine intake during prolonged exercise seems to exert no ergogenic effects on subsequent time-trial performance in junior cyclists. Future studies should determine whether significant effects can be found with larger caffeine doses or after greater fatigue levels.
Standardizing the Quantification of External Load Across Different Training Modalities: A Critical Need in Sport-Science Research
Wissem Dhahbi, Helmi Chaabene, David B. Pyne, and Karim Chamari
Are the Relationships of Physical Activity and Television Viewing Time With Mortality Robust to Confounding? A Study, Utilizing E-Values, From the Melbourne Collaborative Cohort Study
Baldwin Pok Man Kwan, Brigid M. Lynch, Lara Edbrooke, Allison Hodge, and Christopher T.V. Swain
Background: Physical activity and sedentary behavior are associated with health outcomes. However, evidence may be affected by confounding bias. This study aimed to examine the relationships of physical activity and television (TV) viewing time with all-cause, cardiovascular, and cancer mortality in a cohort of Australian adults, and determine the robustness of these relationships to residual and unmeasured confounding. Methods: Data from 27,317 Melbourne Collaborative Cohort Study participants (mean age = 66) were used. Physical activity was assessed using the International Physical Activity Questionnaire—Short Form and categorized as insufficient, sufficient, or more than sufficient. TV viewing time was categorized as low, moderate, or high. Multivariable Cox regression models were used to evaluate associations of interest. E-values were calculated to assess the strength of unmeasured confounders required to negate the observed results. Results: For highest versus lowest physical activity category, the hazard ratio was 0.67 (95% confidence interval, 0.56–0.81) for all-cause mortality; E-values ranged between 1.79 and 2.44. Results were similar for cardiovascular mortality; however, hazard ratios were lower (0.72; 95% confidence interval, 0.51–1.01) and E-values much smaller (1.00–2.12) for cancer mortality. For highest versus lowest TV viewing time category, the hazard ratio was 1.08 (1.01–1.15) for all-cause mortality; E-values ranged between 1.00 and 1.37. Results were similar for cardiovascular and cancer mortality. Conclusions: Physical activity and TV viewing time were associated with mortality. The robustness to unmeasured/residual confounding was moderate for physical activity (all-cause and cardiovascular mortality), but weaker for physical activity (cancer mortality) and TV viewing time in this study of Australian adults.
A Comment on González et al: Predicting Injuries in Elite Female Football Players With Global-Positioning-System and Multiomics Data
Lorenzo Lolli
Erratum. Exploring 24-Hour Movement Behaviors in Early Years: Findings From the SUNRISE Pilot Study in Tunisia
Pediatric Exercise Science
“I Use Technologies Strategically With My Family Now”: Practices That Parents Value to Promote Physical Activity in Young Children
Juliana Zabatiero, Laura Stone, Derek McCormack, David Zarb, Andrea Nolan, Kate Highfield, Helen Skouteris, Susan Edwards, and Leon Straker
Background: Although widely accessible digital technology (DT) provided multiple opportunities for young children’s play, learning, and development, it also raised parents and professionals’ concerns regarding its impact on children’s physical activity. This study aimed to identify practices involving DT that were valued by parents in helping their young child to be physically active. Methods: Participants were parents of ambulatory young children (less than 5 y of age) engaged with a playgroup. The study involved representatives from 3 service organizations, who compiled a list of digital resources related to using DT to promote children’s physical activity that were suitable to be shared and trialed by parents and young children. During a pretrial workshop, researchers, participants, and organization representatives collaboratively developed the intervention, which involved the delivery of selected resources by weekly email, over a 12-week period. Participants provided weekly feedback about their experiences and participated in a postintervention semistructured qualitative interview. Results: Thirteen families, with children aged between 15 and 36 months, completed the trial. Participants reported several valued practices to promote their children’s physical activity, including those where the child was active while engaging with DT, where child engagement with DT acted as a prompt for later physical activity, where DT assisted parents in planning physical activity, where DT assisted parents in integrating movement with learning and play, and where DT was used to reinforce the child’s enthusiasm for physical activity. Conclusions: Parents reported several valued practices where children were physically active, rather than sedentary, while using digital technology.
Implementation Evaluation of a Parks- and Faith-Based Multilevel Intervention to Promote Physical Activity Among Latinos
Lilian G. Perez, Tara Blagg, Alane Celeste-Villalvir, Gabriela Castro, Michael A. Mata, Sergio Perez, Elva Arredondo, Steven Loy, Anne Larson, and Kathryn P. Derose
Background: Latinos in the United States face multiple barriers to engaging in physical activity (PA). We implemented a faith-based multilevel intervention to promote PA in parks for Latino adults, which was partially adapted to a virtual platform during the COVID-19 pandemic, and evaluated it using the Reach, Effectiveness, Adoption, Implementation, and Maintenance framework. Methods: We conducted in-depth semistructured interviews (83% in Spanish) with 24 intervention participants (75% women) participating in a cluster randomized controlled trial in 2019–2022 that linked 6 churches (3 intervention, 3 control) with parks in East Los Angeles, CA. The intervention included in-person, park-based fitness classes, which were adapted to Facebook during the pandemic; PA motivational text messages; and other activities. Interviews assessed Reach (participation), Effectiveness (perceived impacts), Implementation (participation barriers/facilitators), and Maintenance (plans for sustaining PA), as well as perceived pandemic impacts. Results: About 80% of interviewees participated in ≥1 park class and 67% in ≥1 virtual class (Reach). Interviewees perceived positive intervention impacts across multiple health and well-being domains (Effectiveness) despite perceived negative pandemic impacts; several facilitators to participation (personal, social, program) and few barriers (personal, virtual, environmental; Implementation); and plans for maintaining PA (eg, revisiting intervention text messages and video recordings; Maintenance). Conclusions: Findings support the utility of Reach, Effectiveness, Adoption, Implementation, and Maintenance to understand the broad impacts of a faith-based PA intervention. Findings point to the adaptability and robustness of the intervention during a public health crisis. Overall, findings may help inform the translation of the intervention to other communities to advance health equity.
Response to Lolli: Predicting Injuries in Elite Female Football Players With Global-Positioning-System and Multiomics Data
Juan R. Gonzalez and Gil Rodas
Strategic Analysis of Net Exchanges in Professional Padel: Insights From Different Competition Phases of the World Padel Tour Finland Padel Open Tournament
Adrián Escudero-Tena, Rafael Conde-Ripoll, Corrado Lupo, and Alexandru Nicolae Ungureanu
Purpose: This study analyzed the effectiveness of net exchanges (ie, number of times the pairs exchange their zone on the court from the net zone to the back zone or vice versa) in men’s and women’s professional padel depending on the competition phase. Methods: Data were collected from 41 matches, comprising a total of 4829 points, from both the qualifying and the main draws of the World Padel Tour Finland Padel Open tournament. Descriptive analysis (frequency and percentage) and inferential tests (Pearson chi-square [χ 2], Cramer V coefficient [Vc], corrected standardized residuals, and chi-squared automatic interaction detection) were carried out. Results: There were significant differences (P < .05) in net exchanges between the main and qualifying draws, both in men’s (79.6% vs 72.1% for no exchanges) and women’s (62.2% vs 57.6% for no exchanges) padel. Additionally, differences in the likelihood of winning points based on whether the serving pair or the returning pair finished the rally at the net were highlighted. Indeed, finishing rallies at the net for the serving pairs increased the probability of scoring a winning shot (ie, in even-numbered net exchanges), while finishing rallies away from the net (ie, in odd-numbered net exchanges) was more likely to result in errors, for both male and female players and main and qualifying draws. Conclusion: This study provides valuable insights into the strategic behavior of professional padel matches, highlighting the importance of net dominance and its impact on match outcomes, particularly in relation to gender differences and phase of competition.
