PhD Research Summary

Research Background

The prevalence of severe obesity (>140% of the 95th percentile) among adolescents continues to rise globally, with particularly concerning trends in both physiological and psychological health outcomes. While exercise is a cornerstone of obesity intervention, the specific exercise responses and adaptations in adolescents with severe obesity remain understudied, limiting evidence-based prescription guidelines.

Project Title

“Cardiorespiratory Adaptations and Insulin Resistance Changes Following a Structured 12-Week Exercise Intervention in Adolescents with Severe Obesity: A Mixed-Methods Analysis”

Research Hypothesis

The central hypothesis of this research is that a structured, progressive 12-week exercise program, delivered remotely, will produce significant improvements in cardiorespiratory function and insulin sensitivity in adolescents with severe obesity. Furthermore, these improvements will correlate with program adherence and psychological measures of self-efficacy and body satisfaction.

Methodology

Study Design

A prospective intervention study with pre- and post-measurements, including a mixed-methods analysis of adherence factors.

Participants

40 adolescents (ages 13-18) with BMI >140% of the 95th percentile

Intervention

12-week structured exercise program with progressive intensity, delivered remotely via Zoom

Primary Outcome Measures

  • Changes in VO₂peak
  • Changes in HOMA-IR (insulin resistance)
  • Spirometry parameters
  • Exercise capacity (6-minute walk test)

Secondary Outcome Measures

  • Exercise adherence rates
  • Physical activity levels (accelerometry)
  • Psychological measures (quality of life, self-efficacy)
  • Body composition changes
  • Qualitative analysis of barriers and facilitators

Innovation and Significance

This research addresses several critical gaps in the current literature:

  1. Population Focus: Specifically targets severe obesity, the fastest-growing pediatric obesity category

  2. Intervention Type: Examines exercise-only effects rather than combined interventions

  3. Delivery Method: Tests the efficacy of remote delivery, which dramatically increases accessibility

  4. Physiological Mechanisms: Explores the relationship between cardiorespiratory adaptations and insulin resistance

  5. Mixed-Methods Approach: Combines quantitative physiological measures with qualitative assessment of adherence factors

Timeline

  • Months 1-3: Recruitment and baseline testing
  • Months 4-6: Exercise intervention delivery
  • Months 7-8: Post-intervention testing
  • Months 9-12: Data analysis and manuscript preparation

Expected Outcomes

This research is expected to:

  1. Establish the efficacy of structured, remote exercise interventions for adolescents with severe obesity

  2. Identify the relationship between exercise dose (frequency, intensity, duration) and physiological adaptations in this population

  3. Determine key predictors of adherence and program success

  4. Create an evidence-based framework for exercise prescription in pediatric severe obesity

  5. Inform future interventions targeting this vulnerable population