The Effects of High-Intensity Interval Training on Cardiorespiratory Fitness in Sedentary Individuals: A Longitudinal Study

Thesis Abstract

Abstract
This thesis presents a comprehensive longitudinal study on the effects of high-intensity interval training (HIIT) on cardiorespiratory fitness in sedentary individuals. The global rise in sedentary lifestyles and associated health risks necessitates effective and time-efficient exercise interventions to improve cardiovascular and respiratory health. High-intensity interval training has gained popularity due to its potential to elicit significant physiological adaptations in a shorter time frame compared to traditional moderate-intensity continuous training. This study aims to investigate the specific impacts of HIIT on cardiorespiratory fitness parameters, such as maximal oxygen consumption (VO2 max), heart rate, and respiratory function, in sedentary individuals over an extended period. The introductory chapter sets the stage by providing an overview of the research problem, background information on the significance of cardiorespiratory fitness, and the rationale behind studying HIIT as an intervention for sedentary individuals. The research objectives, limitations, scope, and significance of the study are outlined, followed by a detailed structure of the thesis and definitions of key terms to establish a clear framework for the research. The literature review chapter critically evaluates existing research on HIIT and its effects on cardiorespiratory fitness, highlighting key studies, methodologies, and findings to provide a comprehensive understanding of the current knowledge in the field. Ten key themes emerge from the literature review, including the mechanisms of HIIT adaptation, comparisons with traditional training methods, and considerations for sedentary populations. The research methodology chapter details the study design, participant recruitment criteria, measurement protocols, and data analysis procedures employed in the longitudinal study. Eight key components are discussed, including the selection of HIIT protocols, participant monitoring methods, and statistical analyses to assess changes in cardiorespiratory fitness parameters over time. The findings chapter presents a thorough discussion of the results obtained from the longitudinal study, including changes in VO2 max, heart rate, and respiratory function following the HIIT intervention. The impact of training intensity, frequency, and duration on cardiorespiratory adaptations is analyzed, along with individual variations in response to the exercise program. In the concluding chapter, the overall findings of the study are summarized, key implications for sedentary individuals and healthcare professionals are discussed, and recommendations for future research are proposed. The thesis contributes valuable insights into the efficacy of HIIT as a time-efficient intervention to improve cardiorespiratory fitness in sedentary individuals, with potential implications for public health promotion and personalized exercise prescriptions.