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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport


Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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The Journal of Sports Medicine and Physical Fitness 2015 Nov 26

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

Latasa I. 1, Cordova A. 2, Villa G. 3, Quintana G. 4, Rodriguez- Falces J. 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

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-min 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. 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. 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 min. It is concluded that 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.

lingua: Inglese


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