Article ID Journal Published Year Pages File Type
2701418 Journal of Science and Medicine in Sport 2014 5 Pages PDF
Abstract

ObjectivesThis study examined the reproducibility of speed corresponding to specific lactate markers during incremental treadmill running of normal and prolonged stage durations.DesignNineteen healthy participants (14 male, 5 female) performed repeated, incremental treadmill running trials of 4 and 8 min stages on separate days to examine the test–retest reproducibility of speed at lactate markers. Two trials were completed for each duration in a randomised order.MethodsFingertip blood samples drawn upon stage completion were analysed for plasma lactate, then used to determine running speed at: 2.0, 3.5, and 4.0 mmol l−1 fixed blood lactate accumulations (FBLA), a 1 mmol l−1 rise from baseline, and the markers: the deviation maximum (Dmax), the Dmax of the second curve derivative (D2Lmax), the lactate threshold (LT) and log–log LT.ResultsThe 2.0 mmol l−1 FBLA reported the lowest mean bias between 4 min trials (−0.06 km h−1), with the narrowest limits of agreement (LoA) (−1.78 to 1.66 km h−1). The Dmax had the second lowest bias (0.14 km h−1), D2Lmax the second narrowest LoA (−1.93 to 2.90 km h−1). For 8 min stages, the 1 mmol l−1 rise demonstrated, low mean bias (−0.13 km h−1) and narrowest LoA (−1.22 to 0.97 km h−1) between trials.ConclusionsThis preliminary report suggests the reproducibility of running speed at lactate summary markers is influenced by stage duration for incremental treadmill running. Varied marker reproducibility between 4 and 8 min stages indicates different blood lactate response, and therefore workload calculation, according to stage length. Consideration of marker construct is recommended.

Related Topics
Health Sciences Medicine and Dentistry Orthopedics, Sports Medicine and Rehabilitation
Authors
, , ,