3 53 Normative Calf Muscle Strength-Endurance Values: An International Study Table 2. Normative data for the HRET metrics of the primary outcome measures. Normative values HRET metrics (n=483) Median (95%RI)* Overall Female Male Dominant leg Repetitions (n) 25 (13 – 50) 24 (13 – 43) 26 (14 – 53) Total work (Joule) 1374 (609 – 2676) 1204 (608 – 2151) 1676 (623 – 2935) Total displacement (cm) 192 (86 – 376) 182 (84 – 343) 210 (91 – 405) Peak height (cm) 9.3 (5.2 – 13.0) 9.2 (5.5 – 12.5) 9.4 (4.9 – 13.9) Non-dominant leg Repetitions (n) 24 (12 – 51) 23 (11 – 48) 26 (13-62) Total work (J) 1325 (539 – 2786) 1130 (488 – 2098) 1623 (662 – 3168) Total displacement (cm) 186 (84 – 380) 174 (75 – 361) 204 (100 – 448) Peak height (cm) 9.6 (5.6 – 13.8) 9.4 (5.4 – 12.7) 10.1 (5.7 – 14.1) Abbreviations: HRET; Heel Rise Endurance Test, RI; Reference Interval. * Values are median with 95% reference interval (2.5th and 97.5th percentile) There was no statistically significant difference between the dominant and the nondominant side for any of the HRET metrics nor a correlation between leg dominance and HRET metrics (supplementary file 1, supplementary Table 3 and supplementary Table 4). Bivariate analyses revealed that there was a significant correlation between gender (r=0.20,p<0.001), height (r=0.17,p<0.001), BMI (r=-0.28, p<0.001) and PAL (r=0.23, p<0.001) with the number of repetitions. Total work significantly correlated with gender (r=0.45, p<0.001), height (r=0.52, p<0.001), mass (r=0.33, p<0.001) and PAL (r=0.19, p<0.001). Gender (r=0.23, p<0.001), height (r=0.26, p<0.001), BMI (r=-0.32, p<0.001) and PAL (r=0.21, p<0.001) significantly correlated with total displacement. There was a significant correlation between gender (r=0.12, p=0.009), height (r=0.20, p<0.001), and BMI (r=-0.15, p<0.001) with peak height. Results of the bivariate analyses for the secondary outcome measures are presented in supplementary file 1. The results of the multiple quantile regression model with estimates of the relevant parameters on the different HRET metrics are displayed in Table 3 (and supplementary file 1, supplementary Table 5 for the secondary outcome measures).
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