Reproducibility of lactate markers during 4 and 8 min stage incremental running: a pilot study.

Gavin, J., Willems, M.E.T. and Myers, S.D., 2014. Reproducibility of lactate markers during 4 and 8 min stage incremental running: a pilot study. Journal of Science and Medicine in Sport, 17 (6), 635 - 639.

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DOI: 10.1016/j.jsams.2013.08.006


OBJECTIVES: This study examined the reproducibility of speed corresponding to specific lactate markers during incremental treadmill running of normal and prolonged stage durations. DESIGN: Nineteen 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. METHODS: Fingertip 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 (D2L(max)), the lactate threshold (LT) and log-log LT. RESULTS: The 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)), D2L(max) 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. CONCLUSIONS: This 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.

Item Type:Article
Uncontrolled Keywords:Sports medicine ; Running ; Lactate testing ; Incremental exercise ; Exercise tolerance ; Training prescription
Group:Faculty of Management
ID Code:21610
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:04 Nov 2015 15:45
Last Modified:02 Aug 2016 11:53


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