School-based high-intensity interval training programs in children and adolescents: A systematic review and meta-analysis

PURPOSE

1) To investigate the effectiveness of school-based high-intensity interval training (HIIT) interventions in promoting health outcomes of children and adolescents compared with either a control group or other exercise modality; and 2) to explore the intervention characteristics and process outcomes of published school-based HIIT interventions.

METHODS

We searched Medline, Embase, CINAHL, SPORTDiscus, and Web of Science from inception until 31 March 2021. Studies were eligible if 1) participants aged 5-17 years old; 2) a HIIT intervention within a school setting ≥ 2 weeks duration; 3) a control or comparative exercise group; 4) health-related, cognitive, physical activity, nutrition, or program evaluation outcomes; and 5) original research published in English. We conducted meta-analyses between HIIT and control groups for all outcomes with ≥ 4 studies and meta-regressions for all outcomes with ≥ 10 studies. We narratively synthesised results between HIIT and comparative exercise groups.

RESULTS

Fifty-four papers met eligibility criteria, encompassing 42 unique studies (35 randomised controlled trials; 36 with a high risk of bias). Meta-analyses indicated significant improvements in waist circumference (mean difference (MD) = -2.5cm), body fat percentage (MD = -1.7%), body mass index (standardised mean difference (SMD) = -1.0), cardiorespiratory fitness (SMD = +1.0), resting heart rate (MD = -5bpm), homeostatic model assessment-insulin resistance (MD = -0.7), and low-density lipoprotein cholesterol (SMD = -0.9) for HIIT compared to the control group. Our narrative synthesis indicated mixed findings between HIIT and other comparative exercise groups.

CONCLUSION

School-based HIIT is effective for improving several health outcomes. Future research should address the paucity of information on physical activity and nutrition outcomes and focus on the integration and long-term effectiveness of HIIT interventions within school settings.

TRIAL REGISTRATION NUMBER

PROSPERO CRD42018117567.

Empowerment Approaches in Childhood Weight Management: A Systematic Review

Empowerment interventions facilitate individuals, organizations, and communities to gain better control over their health. They are distinctly different from traditional behavior change models and encourage participants to set their own health priorities and agenda. Current evidence suggests empowerment interventions are efficacious for smoking, sexual, and mental health outcomes. However, empowerment in childhood obesity (which remains a global public health challenge) is underresearched. This review systematically analyzed the evidence for empowerment approaches in childhood weight management. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines were followed. A search strategy was applied to six databases from inception to May 25, 2021. Evidence was appraised using The Academy of Nutrition and Dietetics Quality Criteria Checklist and National Health and Medical Research Council Levels of Evidence. Of the 9274 articles identified, 29 articles describing 14 programs met the inclusion criteria. Twenty-five studies rated positive and four rated neutral. Overall, the evidence body rated "B." Seventy-two percent of the 3318 participants were from priority populations, highlighting the unique ability of empowerment interventions to engage those most in need. Results demonstrate small to large improvements in participant body mass index with effect sizes ranging from 0.08 to 1.13. Throughout the literature, empowerment was measured inconsistently and usually with a surrogate marker. All studies were set in America or Canada. This review suggests empowerment should be further investigated in childhood weight management. Empowerment interventions represent a unique opportunity to meaningfully integrate self-determination to clinical childhood weight management practice and overcome current barriers related to priority population engagement.

Comparison of the Elevated Temperature Plate Count (ETPC) and MPN Procedure to Estimate the Densities of Fecal Coliforms and Escherichia coli in Soft-Shell Clams

The Elevated Temperature Plate Count procedure of Hefferman and Cabelli was assessed to measure the sanitary quality of soft shell clams. The method, compared to the standard MPN procedure, underestimated the densities of fecal coliforms by about 10%. The estimated cell densities of Escherichia coli and Enterobacter aerogenes in saline suspension were about 20% lower than the estimate obtained on nutrient agar plates. Thus, the fecal coliform standard used in the assessment of sanitary quality of clams would need to be modified when the analysis is conducted by the Elevated Temperature Plate Count procedure.