Table 1 Baseline characteristics of the study subjects
From: Sex differences in response to maximal exercise stress test in trained adolescents
Females (n = 24) | Males (n = 27) | P-value | |
|---|---|---|---|
Age (years) | 16.5 ± 1.8 | 17.0 ± 1.3 | 0.26 |
Height (cm) | 168 ± 5 | 179 ± 6 | P < 0.001 |
Weight (kg) | 61.3 ± 9.2 | 69.7 ± 9.1 | P = 0.002 |
BMI (kg/m2) | 21.6 ± 2.8 | 21.7 ± 2.7 | P = 0.84 |
Training pr week (hours) | 7.4 ± 1.6 | 8.8 ± 1.3 | P = 0.002 |
Total body fat (kg/%) | 15.1 ± 5.3/23.1 ± 6.5 | 8.9 ± 4.2/12.7 ± 5.1 | P < 0.001 |
Total body fat free mass (kg) | 46.6 ± 5.3 | 60.7 ± 7.7 | P < 0.001 |
Total leg muscle mass (kg) | 15.0 ± 1.9 | 20.0 ± 2.7 | P < 0.001 |
Hemoglobin (g/l) | 132 ± 6 | 147 ± 8 | P < 0.001 |
Creatinine (μmol/l) | 65 ± 10 | 78 ± 9 | P < 0.001 |
Resting ECG parameters | |||
PR interval (msec) | 149 ± 21 (149 ± 21; N = 23) | 144 ± 14 | P = 0.39 |
QRS duration (msec) | 95 ± 20 (92 ± 7.6; N = 23) | 99 ± 9.9 | P = 0.43 |
QTc (msec) | 440 ± 36 (435 ± 25; N = 23) | 417 ± 20 | P = 0.007 |
P axis (°) | 52 ± 26 (52 ± 26; N = 23) | 50 ± 28 | P = 0.79 |
QRS axis (°) | 65 ± 38 (70 ± 29; N = 23) | 80 ± 24 | P = 0.10 |
T axis (°) | 59 ± 47 (50 ± 17; N = 23) | 54 ± 17 | P = 0.57 |