Introduction
FRANKLIN, STS
Quantifying endurance exercise capacity, cardiopulmonary exercise testing is defined as the gold standard (Franklin and American College of Sports It is appealing to perform functional exercise capacity testing with little and easily accessible material, such as a chair and a stopwatch. However, this simplicity may be a source for bias and inaccuracy regarding performance quantification. More precisely, seat height of conventional chairs for 1MSTSTs ranges between 44.5 and 48 cm. Depending on body height of participants, this results in significant inter-individual knee joint angle variability during testing (Chorin et al. Biomechanical evidence suggests standardisation of the knee joint flexion angle to 90° in the starting position for STS evaluations in order to generate more reliable data (Chorin et al. Since knee joint angles in seated position are mainly determined by tibia length, we hypothesized that controlling for this factor would prevent over- or underestimation of functional exercise capacity in 1MSTST data. Allometric scaling may do controlling (Jaric et al. Thus, we aimed to (i) investigate differences in 1MSTST performance (i.e., the number of repetitions) between a standardised modality (i.e., starting from a conventional chair) and an individualised modality (i.e., starting with a knee joint flexion angle of 90°), and to (ii) quantify the influence of tibia and femur length on 1MSTST performance.