Fig. 5From: Submaximal Fitness Test in Team Sports: A Systematic Review and Meta-Analysis of Exercise Heart Rate Measurement PropertiesMixed-effects meta-regression of the changes in Correlation Coefficient (r) while controlling for the effects of mean age (A); SMFT exercise intensity (HRex) (B); SMFT duration (C); age category (senior vs. youth) (D); HRex collection method (fixed vs. mean range) (E); and level (elite vs. sub-elite) (F). Data points represent individual effect estimates included in our meta-analysis, and the size of the data point is proportional to their weighting. Green, red and blue points represent studies using continuous fixed, intermittent incremental and intermittent variable modality, respectively. Solid lines represent the estimate of the modifying effect. Dashed and dotted lines represent 95% confidence and prediction limits, respectively. HRex exercise heart rate, y years, min minutesBack to article page