Substantive variables
Participants’characteristics:
▪ Number of participants of each group (traditional training/control and Flywheel resistance training).
▪ Age (years): average age of the total sample (FRT and traditional training/control groups together) and the mean age of FRT and traditional training/control groups.
▪ Sex: coded as males, females, and mixed, as the percentage difference between men in the FRT and traditional training/control groups.
▪ Previous experience in FRT.
Treatment characteristics
▪ Type of intervention (traditional training/control groups together, FRT).
▪ Duration of the program (weeks).
▪ Training sessions per week.
▪ Training sessions per day.
▪ Number of exercises.
▪ Type of exercise.
▪ Number of repetitions per exercise.
▪ Duration of each repetition in each exercise (seconds).
▪ Type of exercise (unilateral, bilateral).
▪ Intensity of each exercise.
Methodological variables
▪ Study design (randomized controlled trial or a cross-over study).
▪ Quality of the study (PEDro scale).
▪ Attrition in the post-test (percentage of participants in the final sample divided by the number of people in the initial sample).
Extrinsic variables
▪ Year of the study.
▪ Country.