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Maximal lactate steady state, critical power and EMG during cycling.
Eur J Appl Physiol. 2002 Dec; 88(3):214-26.EJ

Abstract

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<0.05], although the two variables were strongly correlated (r=0.95; P<0.01). The EMG(FT) could not be determined in 50% of the subjects. Blood [La], VO(2) and minute ventilation all increased significantly with time for exercise at power outputs above the P-MLSS. In conclusion, the P-MLSS, and not the CP, represents the upper limit of the heavy exercise domain in cycling. During exercise above the P-MLSS, there is no association between changes in iEMG and increases in VO(2) and blood [La] with time.

Authors+Show Affiliations

Department of Exercise and Sport Science, Manchester Metropolitan University, Hassall Road, Alsager, ST7 2HL, UK.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

12458364

Citation

Pringle, Jamie S M., and Andrew M. Jones. "Maximal Lactate Steady State, Critical Power and EMG During Cycling." European Journal of Applied Physiology, vol. 88, no. 3, 2002, pp. 214-26.
Pringle JS, Jones AM. Maximal lactate steady state, critical power and EMG during cycling. Eur J Appl Physiol. 2002;88(3):214-26.
Pringle, J. S., & Jones, A. M. (2002). Maximal lactate steady state, critical power and EMG during cycling. European Journal of Applied Physiology, 88(3), 214-26.
Pringle JS, Jones AM. Maximal Lactate Steady State, Critical Power and EMG During Cycling. Eur J Appl Physiol. 2002;88(3):214-26. PubMed PMID: 12458364.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Maximal lactate steady state, critical power and EMG during cycling. AU - Pringle,Jamie S M, AU - Jones,Andrew M, Y1 - 2002/09/19/ PY - 2002/07/19/accepted PY - 2002/11/30/pubmed PY - 2003/1/29/medline PY - 2002/11/30/entrez SP - 214 EP - 26 JF - European journal of applied physiology JO - Eur. J. Appl. Physiol. VL - 88 IS - 3 N2 - 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<0.05], although the two variables were strongly correlated (r=0.95; P<0.01). The EMG(FT) could not be determined in 50% of the subjects. Blood [La], VO(2) and minute ventilation all increased significantly with time for exercise at power outputs above the P-MLSS. In conclusion, the P-MLSS, and not the CP, represents the upper limit of the heavy exercise domain in cycling. During exercise above the P-MLSS, there is no association between changes in iEMG and increases in VO(2) and blood [La] with time. SN - 1439-6319 UR - https://www.unboundmedicine.com/medline/citation/12458364/Maximal_lactate_steady_state_critical_power_and_EMG_during_cycling_ L2 - https://dx.doi.org/10.1007/s00421-002-0703-4 DB - PRIME DP - Unbound Medicine ER -