**ABBREVIATIONS:** |

OBS | Observer |

SAT | Subcutaneous adipose tissue |

US | Ultrasound |

**Parameters and variables:** |

*m* | Body mass, in kg |

*h* | Body height (stature) in m |

*s* | Sitting height, in m |

BMI | Body mass index: BMI=m/h^{2}, in kgm^{−2} |

MI_{1} | Mass index: MI_{1}=0.53·m/(hs), in kgm^{−2} |

*d* | SAT thickness measured by an individual observer at a given site, in mm (this is the average of the distances measured within the region of interest) |

D | Sum of SAT-thicknesses measured by an individual observer at all eight sites in a given participant, in mm |

δ | measurement deviation of an individual observer from the mean of the three observers at a given site in a given athlete, in mm |

δ_{rel} | δ_{rel}= 100· δ/d_{MEAN}, in [%] |

Δ | Deviation of the sum of eight sites measured by an individual observer from the mean of the sums of the three observers in a given athlete, in mm |

Δ_{rel} | Δ_{rel}= 100·Δ/D_{MEAN}, in [%] |

EXCL | Excluded; indicates that the fibrous structures embedded in the SAT are not included in the thickness value. |

INCL | Included; indicates that the fibrous structures are included |

*c* | speed of sound |

**Statistics:** |

N | Number of values |

ABS | Absolute value of a number |

MEAN | Mean value |

SD | Standard deviation |

SEE | Standard error of estimate |

ICC | Intraclass correlation coefficient |

IQR | Interquartile range |

R^{2} | Coefficient of determination |

ρ | Spearman's rank correlation coefficient (Spearman's rho) |

**Ultrasound sites:** |

UA | Upper abdomen |

LA | Lower abdomen |

ES | Erector spinae |

DT | Distal triceps |

BR | Brachioradialis |

FT | Front thigh |

LT | Lateral thigh |

MC | Medial calf |

EO | External oblique |