Home > Journals > The Journal of Sports Medicine and Physical Fitness > Past Issues > The Journal of Sports Medicine and Physical Fitness 2017 January-February;57(1-2) > The Journal of Sports Medicine and Physical Fitness 2017 January-February;57(1-2):33-42

CURRENT ISSUE
 

JOURNAL TOOLS

eTOC
To subscribe
Submit an article
Recommend to your librarian
 

ARTICLE TOOLS

Publication history
Reprints
Permissions
Cite this article as

 

ORIGINAL ARTICLE  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2017 January-February;57(1-2):33-42

DOI: 10.23736/S0022-4707.16.05768-6

Copyright © 2015 EDIZIONI MINERVA MEDICA

language: English

Estimation of the neuromuscular fatigue threshold from an incremental cycling test using 1-minute exercise periods

Iban LATASA 1, Alfredo CORDOVA 2, Gerardo VILLA 3, Gregorio QUINTANA 4, Javier RODRIGUEZ-FALCES 1

1 Department of Electrical and Electronical Engineering, Public University of Navarra, Pamplona, Spain; 2 Department of Physiology and Biochemistry, University of Valladolid, Soria, Spain; 3 Department of Physical Education, University of Leon, Leon, Spain; 4 Department of Engineering and Computer Science, University Jaume I, Castellón, Spain


PDF


BACKGROUND: The objectives of this study were: 1) to evaluate the method used for estimating the neuromuscular fatigue threshold from surface electromyographic amplitude (the PWCFT test) during a single incremental cycling workout using 1-minute exercise periods, and 2) to investigate the possible associations between PWCFT and metabolic (onset of blood lactate accumulation [OBLA]) and ventilatory (ventilatory threshold [VT] and respiratory compensation point [RCP]) variables.
METHODS: Sixteen cyclists performed incremental cycle ergometer rides to exhaustion with bipolar surface sEMG signals recorded from the vastus lateralis. Subsequently, participants performed one constant-workload exercise test at 100% of their PWCFT.
RESULTS: During the incremental test, the power output at PWCFT was not correlated with that of OBLA (P>0.05), but it was positively correlated with those of VT and RCP (P<0.05). During the constant-workload test, heart rate and blood lactate increased progressively and significantly (P<0.05), whereas sEMG amplitude remained unchanged (P>0.05). The average duration of the constant-workload exercise was 8-9 minutes.
CONCLUSIONS: The application of the PWCFT method using 1-min exercise periods could lead to overestimation of the neuromuscular fatigue threshold most likely because this stage duration allows insufficient time for the sEMG response to manifest.


KEY WORDS: Bicycling - Muscle fatigue - Electromyography - Lactates

top of page