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Muscle Nerve. 2017 Jul;56(1):152-159. doi: 10.1002/mus.25460. Epub 2017 Mar 27.

Peripheral and central fatigue after high intensity resistance circuit training.

Author information

1
Department of Physical Education and Sport, Faculty of Sport Sciences, Catholic University of Murcia (UCAM), Murcia, Spain.
2
Research Center for High Performance Sport. Catholic University of Murcia (UCAM), Murcia, Spain.
3
Learning and Human Movement Control Group, Department of Physical Education and Sport, Faculty Sport Sciences and Physical Activity, University of A Coruña, A Coruña, Spain.
4
Department of Medicine, Movement and Sports Science, University of Fribourg, Fribourg, Switzerland.

Abstract

INTRODUCTION:

The aim of this study was to investigate the effects of high intensity resistance circuit (HIRC) and traditional strength training (TST) on neuromuscular fatigue and metabolic responses.

METHODS:

Twelve trained young subjects performed HIRC and TST in a counterbalanced order with 1 week rest in-between. The amount of workload and the inter-set time for each local muscle group were matched (180 s), however, the time between successive exercises differed. The twitch interpolation technique was used to test neuromuscular function of the knee extensor muscles. Blood lactate concentration was used to evaluate metabolic responses.

RESULTS:

Maximum voluntary contraction and resting potentiated twitch amplitude (Qtw ) were significantly reduced after HIRC, but there were not changes after TST, while reductions in voluntary activation were similar. Lactate concentration increased significantly more after HIRC.

CONCLUSIONS:

The higher lactate concentration after HIRC probably impaired excitation-contraction coupling, indicating larger peripheral fatigue than after TST. Muscle Nerve 56: 152-159, 2017.

KEYWORDS:

fatigue; metabolic response; neuromuscular function; perception of effort; resistance training; twitch interpolation technique

PMID:
28346689
DOI:
10.1002/mus.25460
[Indexed for MEDLINE]

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