The Effect of Training Intensity on VO2max in Young Healthy Adults: A Meta-Regression and Meta-Analysis

Trisha D Scribbans, Stephan Vecsey, Paul B Hankinson, William S Foster, Brendon J Gurd, Trisha D Scribbans, Stephan Vecsey, Paul B Hankinson, William S Foster, Brendon J Gurd

Abstract

Exercise training at a variety of intensities increases maximal oxygen uptake (VO2max), the strongest predictor of cardiovascular and all-cause mortality. The purpose of the present study was to perform a systematic review, meta-regression and meta-analysis of available literature to determine if a dose-response relationship exists between exercise intensity and training-induced increases in VO2max in young healthy adults. Twenty-eight studies involving human participants (Mean age: 23±1 yr; Mean VO2max: 3.4±0.8 l·min-1) were included in the meta-regression with exercise training intensity, session dose, baseline VO2max, and total training volume used as covariates. These studies were also divided into 3 tertiles based on intensity (tertile 1: ~60-70%; 2: ~80-92.5%; 3: ~100-250%VO2max), for comparison using separate meta-analyses. The fixed and random effects meta-regression models examining training intensity, session dose, baseline VO2max and total training volume was non-significant (Q4=1.36; p=0.85; R2=0.05). There was no significant difference between tertiles in mean change in VO2max (tertile 1:+0.29±0.15 l/min, ES (effect size) =0.77; 2:+0.26±0.10 l/min, ES=0.68; 3:+0.35±0.17 l/min, ES=0.80), despite significant (p<0.05) reductions in session dose and total training volume as training intensity increased. These data suggest that exercise training intensity has no effect on the magnitude of training-induced increases in maximal oxygen uptake in young healthy human participants, but similar adaptations can be achieved in low training doses at higher exercise intensities than higher training doses of lower intensity (endurance training).

Keywords: Maximal oxygen uptake; exercise intensity; exercise training; intensity dose-response; training dose; training volume; young adults.

Figures

Figure 1
Figure 1
Study Selection Flow Diagram. Flow chart demonstrating the process of study selection. Studies included in quantitative analysis refers to the number of publications from which study groups (n=40) were extracted.
Figure 2
Figure 2
Funnel plot of Cohen’s d effect sizes and standard error for the 40 study groups included. Mean effect size represented by the solid bar with upper and lower 95% confidence intervals represented by the dashed lines.
Figure 3
Figure 3
Forest plot of mean difference in absolute oxygen consumption (VO2max) with 95% credibility intervals (CI’s) for each study (filled circles) and the total for all studies (open circle) included in the meta-regression and -analysis. Training intensity (% of VO2max), pooled standard deviation (SDP), and Cohen’s effect sizes (Cohen’s d) are also shown for each individual, and all studies included. Interventions are organized by ascending order of training intensity with studies assigned to tertile one, two and three, represented by light, medium, and dark grey, respectively. Note: l, liters; min, minutes.
Figure 4
Figure 4
Weighted change in VO2max and population effects for each tertile. (A) Weighted mean change and pooled SEM in absolute oxygen consumption (VO2max) for each tertile (Tertile 1: 60–70% of VO2max; 2: 80–92.5% of VO2max; 3: 100–250% of VO2max). (B) Forest plot of population effects for each tertile with 95% CI’s. Note: CI, credibility interval; l, liters; min, minutes; SEM, standard error of measurement.

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