Reproducibility of lactate markers during 4 and 8 min stage incremental running: a pilot study
Reproducibility of lactate markers during 4 and 8 min stage incremental running: a pilot study
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.
Adult, Biomarkers, Female, Healthy Volunteers, Humans, Lactic Acid, Male, Pilot Projects, Reproducibility of Results, Running, Time Factors, Young Adult, Journal Article
635-639
Gavin, James P.
e0d9b404-3f63-4855-8e64-bf1692e6cc3f
Willems, Marc E.T.
403242a2-7f54-4f8a-887d-d501ae5db0eb
Myers, Steve D.
f1f200f5-f5b1-4eab-8542-4d435b50ed33
November 2014
Gavin, James P.
e0d9b404-3f63-4855-8e64-bf1692e6cc3f
Willems, Marc E.T.
403242a2-7f54-4f8a-887d-d501ae5db0eb
Myers, Steve D.
f1f200f5-f5b1-4eab-8542-4d435b50ed33
Gavin, James P., Willems, Marc E.T. and Myers, Steve 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), .
(doi:10.1016/j.jsams.2013.08.006).
Abstract
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.
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Gavin et al. 2014
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e-pub ahead of print date: 29 August 2013
Published date: November 2014
Keywords:
Adult, Biomarkers, Female, Healthy Volunteers, Humans, Lactic Acid, Male, Pilot Projects, Reproducibility of Results, Running, Time Factors, Young Adult, Journal Article
Identifiers
Local EPrints ID: 428734
URI: http://eprints.soton.ac.uk/id/eprint/428734
ISSN: 1440-2440
PURE UUID: f4cb7262-e301-4e91-a1ac-e92d9979a2ad
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Date deposited: 07 Mar 2019 17:30
Last modified: 16 Mar 2024 04:40
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Author:
Marc E.T. Willems
Author:
Steve D. Myers
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