This systematic review and meta-analysis investigated the influence of dietary nitrate supplementation on resistance exercise performance according to the PRISMA guidelines. Searches were conducted on MEDLINE, PubMed, ScienceDirect, Scopus and SPORTDiscus databases up to April 2023. Inclusion criteria were adult resistance-trained males who supplemented with a nitrate-rich supplement and nitrate-deficient placebo to assess repetitions-to-failure (RTF), peak power, mean power, peak velocity, and/or mean velocity during back squat and bench press exercise. A random effects model was performed on six studies and showed that nitrate supplementation improved RTF (standardized mean difference [SMD]: 0.43, 95% confidence intervals [95% CI]: 0.156 to 0.699, p = 0.002), mean power (SMD: 0.40, 95% CI: 0.127 to 0.678, p = 0.004), and mean velocity (SMD: 0.57, 95% CI: 0.07 to 1.061, p = 0.025) but had no effect on peak power (SMD: 0.204, 95% CI: −0.004 to 0.411, p = 0.054) or peak velocity (SMD: 0.00, 95% CI: −0.173 to 0.173, p = 1.000) when back squat and bench press were combined. Subgroup analyses revealed that back squats were more likely to be enhanced and that a dosing regimen may influence the efficacy of nitrate supplementation. Overall, nitrate supplementation had a small beneficial effect on some aspects of resistance exercise performance, but there were limited studies available and the variability was large. Additional studies that focus on upper and lower body resistance exercise and nitrate dosage are required to elucidate the efficacy of dietary nitrate supplementation on resistance exercise performance.

The purpose of the current study was to assess the effects of acute and short-term nitrate (NO₃⁻)-rich beetroot juice (BR) supplementation on performance outcomes and muscle oxygenation during bench press and back squat exercise. Fourteen recreationally active males were assigned in a randomized, double-blind, crossover design to supplement for 4 days in two conditions: (1) NO₃⁻-depleted beetroot juice (PL; 0.10 mmol NO₃⁻ per day) and (2) BR (11.8 mmol NO₃⁻ per day). On days 1 and 4 of the supplementation periods, participants completed 2 sets of 2 × 70%1RM interspersed by 2 min of recovery, followed by one set of repetitions-to-failure (RTF) at 60%1RM for the determination of muscular power, velocity, and endurance. Quadriceps and pectoralis major tissue saturation index (TSI) were measured throughout exercise. Plasma [NO₃⁻] and nitrite ([NO₂⁻]) were higher after 1 and 4 days of supplementation with BR compared to PL (p < 0.05). Quadriceps and pectoralis major TSI were not different between conditions (p > 0.05). The number of RTF in bench press was 5% greater after acute BR ingestion compared to PL (PL: 23 ± 4 vs. BR: 24 ± 5, p < 0.05). There were no differences between BR and PL for RTF for back squat or power and velocity for back squat or bench press (p > 0.05). These data improve understanding on the ergogenic potential of BR supplementation during resistance exercise.

Children with visual impairments typically demonstrate lower levels of motor competence, physical activity, and perceived motor competence compared to their peers without visual impairments. Stodden and colleagues purport that perceived motor competence mediates the relationship between motor competence and physical activity for youth without visual impairments. Purpose: The purpose of this study was to test whether perceived motor competence mediates the relationship between motor competence and physical activity for youth with visual impairments. Methods: Participants (N = 138; boys = 81, girls = 57) were age 9–18 years (M_age = 13.37, SD = 2.34) with visual impairments. Participants completed the Test of Gross Motor Development-3, the Test of Perceived Physical Competence-VI, and the Physical Activity Questionnaire. Results: Locomotor skills predicted perceived motor competence, which predicted physical activity. Perceived motor competence showed a mediation effect on the path from locomotor skills to physical activity. There was no significant relationship between locomotor skills and physical activity. Conclusion: The results from this study provide initial evidence to support the hypothesis proposed by Stodden and colleagues. These data provide a rationale to include both perceived and actual motor competence within targeted intervention strategies to increase physical activity behaviors for youth with visual impairments. Future research should consider following participants longitudinally to test the roles of perceived and actual motor competence as factors supporting positive developmental trajectories for health.

Purpose: Identifying profiles of preschoolers’ motor competence (MC) is essential for providing accurate and targeted intervention. However, little is known regarding children’s MC profiles, more specifically how skills may present in unique clusters. The purposes of the study were to explore MC profiles of U.S. children ages 3–6 years, quantify the uniqueness of these profiles, and examine differences by age, gender, race, geographic region, socioeconomic status, and Body Mass Index z-scores. Methods: Participants included children (N = 582, n_girls = 296) aged 3–6 years (M_age = 4.97, SD = .75) enrolled in one of seven early childhood education centers (Alabama, Louisiana, Ohio [× 2], South Carolina [× 2], Texas). Each child’s MC was assessed with the 12 skills comprising the TGMD-2. Latent profile analysis was performed using the 12 MC skills. Results: Five profiles of MC emerged, three of which show developing MC but in varying combinations. Wald tests revealed possible MC advantages for preschool children who are older, boys, reside in an urban region, and are of higher socioeconomic status, but only for the proficient MC profile. Conclusion: By uncovering five unique latent MC profiles, professionals should consider the presentation/origins of each profile and use such knowledge to create targeted, individualized MC interventions in American preschoolers. From a research perspective, the implications of this study suggest that researchers should consider person-oriented approaches examining individual skill scores (vs. summed subscale scores) whenever possible.

This systematic review and meta-analysis investigated the influence of dietary nitrate supplementation on performance metrics during cycling sprint exercise according to the PRISMA guidelines. Searches were conducted on MEDLINE, PubMed, ScienceDirect, Scopus, and SPORTDiscus databases up to September 2023. Inclusion criteria were healthy recreationally active men and women who consumed nitrate-rich and nitrate-deficient beetroot juice to assess performance outcomes of mean power, peak power, time-to-peak power, and minimum power during 30-s cycling sprints. Risk of bias was assessed using the Cochrane Risk of Bias 2 and TESTEX tools and funnel plots. A random effects model was performed on six studies and showed that dietary nitrate had significant effects on time-to-peak power (SMD: −0.66, 95% CI: −1.127 to −0.192, p = 0.006) but not on mean power, peak power, or minimum power. Subgroup analysis revealed that an acute low nitrate dose improved time-to-peak power (SMD: −0.977, 95% CI: −1.524 to −0.430, p < 0.001) but not after a multiday moderate nitrate dose (SMD: −0.177, 95% CI: −0.619 to −0.264, p = 0.431). These data suggest that acute nitrate supplementation can benefit time-to-peak power during 30-s cycling sprints, but due to the limited availability of data and heterogeneity in methodology, these results should be interpreted with caution. There was insufficient data on women to analyze sex-based differences. Future studies are required to provide insight on how supplementation regimen and population impact the effects of dietary nitrate for enhancing cycling sprint performance.

Children with visual impairments (VI) tend to struggle with their fundamental motor skills (FMS), and these difficulties often persist across the lifespan, requiring frequent assessment. The Test of Gross Motor Development (TGMD) shows robust psychometric properties for children with VI. The TGMD, which includes 13 skills, is time-consuming to administer and score, warranting the need to explore brief versions. Therefore, the purpose of this study was to explore the psychometric properties of three, six-skill versions of the TGMD-3 with children with VI. Children (n = 302; Boys = 58%, Girls = 42%; Mage = 13.00, SD = 2.50 years) with VI (B1 = 27%, B2 = 20%, B3 = 38%, B4 = 15%) participated in this study. We examined three different models using confirmatory factor analyses on the relationships between the motor skills and latent traits across the models. Scores from all three brief versions had acceptable global fit. Although further research should be conducted, practitioners can adopt a brief version of the TGMD to assess children with VI.