Maximal lactate steady state, critical power and EMG during cycling

We hypothesised that: (1) the maximal lactate steady state (MLSS), critical power (CP) and electromyographic fatigue threshold (EMG(FT)) occur at the same power output in cycling exercise, and (2) exercise above the power output at MLSS (P-MLSS) results in continued increases in oxygen uptake (VO(2)...

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Bibliographic Details
Published in:European journal of applied physiology 2002-12, Vol.88 (3), p.214-226
Main Authors: Pringle, Jamie S M, Jones, Andrew M
Format: Article
Language:English
Subjects:
Adult
Bicycling - physiology
Differential Threshold
Electromyography
Fatigue
Female
Humans
Lactic Acid - blood
Male
Muscle Fatigue - physiology
Muscle, Skeletal - physiology
Osmolar Concentration
Physical Endurance - physiology
Physiology
Random Allocation
Science education
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Summary:We hypothesised that: (1) the maximal lactate steady state (MLSS), critical power (CP) and electromyographic fatigue threshold (EMG(FT)) occur at the same power output in cycling exercise, and (2) exercise above the power output at MLSS (P-MLSS) results in continued increases in oxygen uptake (VO(2)), blood lactate concentration ([La]) and integrated electromyogram (iEMG) with time. Eight healthy subjects [mean (SD) age 25 (3) years, body mass 72.1 (8.2) kg] performed a series of laboratory tests for the determination of MLSS, CP and EMG(FT). The CP was determined from four exhaustive trials of between 2 and 15 min duration. The MLSS was determined as the highest power output at which the increase in blood [La] was less than 1.0 mM across the last 20 min of a series of 30-min trials. The EMG(FT) was determined from four trials of 2 min duration at different power outputs. The surface electromyogram was recorded continuously from the vastus lateralis muscle. The CP was significantly higher than the P-MLSS [242 (25) vs. 222 (23) W; P
ISSN:1439-6319
1439-6327
DOI:10.1007/s00421-002-0703-4