A single test for the determination of parameters of the speed–time relationship for running

A validated expeditious method is needed to determine critical speed (CS) and the finite distance that can be covered above CS (D′). We tested the hypothesis that a single all-out 3-min running test would accurately determine CS and D′. Seven healthy subjects completed three constant-speed runs on a treadmill for the determination of CS and D′, as well as an all-out 3-min test on a track for the determination of end-test speed (ES) and the distance above end-test speed (DES). ES (13.4 ± 2.8 km h−1) was not significantly different from the speed-1/time model CS (13.3 ± 2.8 km h−1). While DES (141 ± 34 m) was not significantly different from D′ (204 ± 103 m), it underestimated D′ in 5 of 7 subjects. Thus, the speed-1/time model CS can be accurately determined using a single 3-min test, while caution should be used in relating DES to D′.

► We compared a 3-min running test to the traditional speed–time relationship.
► 3-Min test parameters were not significantly different from critical speed and D′.
► D′ was underestimated by the 3-min test in 5 of 7 subjects.
► Critical speed can be determined in 3-min test, caution warranted in D′ estimation.