Sex Moderated Mediation of the Musculoskeletal Fitness in Relationship between High-Intensive Interval Training Performing during Physical Education Classes and Cardiorespiratory Fitness in Healthy Boys and Girls.

Jarosław Domaradzki,Marek Popowczak,Dawid Koźlenia,Krzysztof Siemianowicz

doi:10.1155/2022/8760620

Jarosław Domaradzki, Marek Popowczak + Show 2 more

Open Access

https://doi.org/10.1155/2022/8760620

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Abstract

High-intensive interval training (HIIT) is indicated as a means of improving cardiorespiratory fitness (CRF) and musculoskeletal fitness (MSF). The relationship between CRF and MSF was examined too. Little is known about gaining CRF from HIIT independence of MSF in adolescents. Therefore, this study is aimed at investigating whether MSF mediated the relationship between HIIT and CRF and whether sex moderate this relation. The study sample included 122 individuals (45 boys, 77 girls) 16.12 ± 0.38 years of secondary school age. Participants were assigned to the HIIT intervention or control groups. The intervention lasted 14 minutes during one physical education lesson per week for ten weeks. Outcome and potential mediator were residual changes calculated from pre- and postintervention results of MSF components: handgrip (HG), sit-ups (ABS), sit-and-reach (FL), vertical jump (VJ), and Harvard step-test representing cardiorespiratory fitness (CRF). MSF index (MSFI) was calculated as a construct, agglomerating all MSF, and tested its usefulness. HIIT significantly impacted CRF in boys and girls (B = 2.32, p = 0.032; B = 2.28, p = 0.005, respectively). The impact of the HIIT program on the ABS and FL was observed only in girls. The moderation effect of sex was confirmed. Significant effect of HIIT on CRF decreased (Bdirect < Btotal) and was no significant after including FL (B = 1.46, p = 0.62)—complete mediation, but no ABS (B = 2.97, p = 0.001)—partial mediation. CRF was mediated by changes in ABS (B = 2.28, p < 0.001) and FL (4.18, p < 0.001). MSFI was not mediating; its usefulness was limited. HIIT is an effective tool in the development of CRF in both sexes. MSF played a limited role in the relationship between HIIT and CRF. It suggested different mechanisms in both sexes: girls who performed better to the HIIT had better values of FL and ABS, but not boys. HIIT intervention involved modifications in ABS or FL, which also influenced the increase of CRF.

Highlights

Physical fitness (PF) is a construct that contains several components usually separated into cardiorespiratory fitness (CRF) and muscular fitness (MF) [1]
In the Health-Related Fitness (H-RF) concept, MF is linked to flexibility and builds together a multidimensional construct—musculoskeletal fitness (MSF) [2, 3]
There were no premises for using such synthetic measures for boys and girls based on the same MSF components

Summary

Introduction

Physical fitness (PF) is a construct that contains several components usually separated into cardiorespiratory fitness (CRF) and muscular fitness (MF) [1]. In the Health-Related Fitness (H-RF) concept, MF is linked to flexibility and builds together a multidimensional construct—musculoskeletal fitness (MSF) [2, 3]. Studies on MSF are based mainly on these components: muscle strength (static and dynamic) and flexibility [4,5,6]. Global, agglomerated indexes were created and investigated. As an H-RF component [7,8,9], MSF is considered a health marker [10, 11]. Each MSF item can predict health status in childhood or adolescence and later life phases [3, 10]

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