Effect of the SpeedFit Fitness Challenge on Muscle Mass Development and VO₂max Improvement in Men Over 40 Years of Age
DOI:
https://doi.org/10.59614/acief62026297Keywords:
Concurrent training, muscle mass, ATR periodization, physical performance, VO₂maxAbstract
Age-related declines in maximal oxygen uptake (VO₂max), muscle mass, and physical performance negatively affect functional capacity and quality of life in adults over 40 years of age. The aim of this study was to evaluate the effects of a training program based on the SpeedFit Fitness Challenge system, structured through an ATR periodization model, on VO₂max, muscle mass, and specific physical performance in physically active men over 40 years of age. A quantitative, explanatory, quasi-experimental study with a one-group pretestposttest design was conducted involving seven participants aged 43 to 56 years who completed a nine-week intervention. VO₂max was estimated using the Cooper test, muscle mass was assessed through anthropometric measurements, and specific performance was evaluated using the SpeedFit circuit. Data were analyzed using descriptive statistics, the Shapiro-Wilk normality test, the Wilcoxon signed-rank test, and Rosenthal's effect size. The results showed improvements in VO₂max, muscle mass, and specific physical performance, with statistically significant differences between pretest and posttest evaluations and very large effect sizes. It is concluded that the SpeedFit Fitness Challenge system, organized through ATR periodization, is an effective strategy for simultaneously improving cardiorespiratory fitness, muscle mass, and specific physical performance in physically active men over 40 years of age.
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