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Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling

Background: This study tested muscle activity (EMG) and perception of effort in eccentric (ECC) and concentric (CON) cycling before and after four sessions of both. Methods: Twelve volunteers naïve to ECC cycling attended the laboratory six times. On day 1, they performed a CON cycling peak power ou...

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Autores principales: Clos, Pierre, Lepers, Romuald
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7659479/
https://www.ncbi.nlm.nih.gov/pubmed/33105553
http://dx.doi.org/10.3390/ijerph17217702
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author Clos, Pierre
Lepers, Romuald
author_facet Clos, Pierre
Lepers, Romuald
author_sort Clos, Pierre
collection PubMed
description Background: This study tested muscle activity (EMG) and perception of effort in eccentric (ECC) and concentric (CON) cycling before and after four sessions of both. Methods: Twelve volunteers naïve to ECC cycling attended the laboratory six times. On day 1, they performed a CON cycling peak power output (PPO) test. They then carried-out four sessions comprising two sets of 1 to 1.5-min cycling bouts at 5 intensities (30, 45, 60, 75, and 90% PPO) in ECC and CON cycling. On day 2 and day 6 (two weeks apart), EMG root mean square of the vastus lateralis (VL), rectus femoris (RF), biceps femoris (BF), and soleus (SOL) muscles, was averaged from 15 to 30 s within each 1-min bout and perception of effort was asked after 45 s. Results: Before the four cycling sessions, while VL EMG was lower in ECC than CON cycling, most variables were not different. Afterwards, ECC cycling exhibited lower RF EMG at 75 and 90% PPO (all p < 0.02), lower VL and BF EMG at all exercise intensities (all p < 0.02), and inferior SOL EMG (all p < 0.04) except at 45% PPO (p = 0.07). Perception of effort was lower in ECC cycling at all exercise intensities (all p < 0.03) but 60% PPO (p = 0.11). Conclusions: After four short sessions of ECC cycling, the activity of four leg muscles and perception of effort became lower in ECC than in CON cycling at most of five power outputs, while they were similar before.
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spelling pubmed-76594792020-11-13 Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling Clos, Pierre Lepers, Romuald Int J Environ Res Public Health Article Background: This study tested muscle activity (EMG) and perception of effort in eccentric (ECC) and concentric (CON) cycling before and after four sessions of both. Methods: Twelve volunteers naïve to ECC cycling attended the laboratory six times. On day 1, they performed a CON cycling peak power output (PPO) test. They then carried-out four sessions comprising two sets of 1 to 1.5-min cycling bouts at 5 intensities (30, 45, 60, 75, and 90% PPO) in ECC and CON cycling. On day 2 and day 6 (two weeks apart), EMG root mean square of the vastus lateralis (VL), rectus femoris (RF), biceps femoris (BF), and soleus (SOL) muscles, was averaged from 15 to 30 s within each 1-min bout and perception of effort was asked after 45 s. Results: Before the four cycling sessions, while VL EMG was lower in ECC than CON cycling, most variables were not different. Afterwards, ECC cycling exhibited lower RF EMG at 75 and 90% PPO (all p < 0.02), lower VL and BF EMG at all exercise intensities (all p < 0.02), and inferior SOL EMG (all p < 0.04) except at 45% PPO (p = 0.07). Perception of effort was lower in ECC cycling at all exercise intensities (all p < 0.03) but 60% PPO (p = 0.11). Conclusions: After four short sessions of ECC cycling, the activity of four leg muscles and perception of effort became lower in ECC than in CON cycling at most of five power outputs, while they were similar before. MDPI 2020-10-22 2020-11 /pmc/articles/PMC7659479/ /pubmed/33105553 http://dx.doi.org/10.3390/ijerph17217702 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Clos, Pierre
Lepers, Romuald
Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling
title Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling
title_full Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling
title_fullStr Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling
title_full_unstemmed Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling
title_short Leg Muscle Activity and Perception of Effort before and after Four Short Sessions of Submaximal Eccentric Cycling
title_sort leg muscle activity and perception of effort before and after four short sessions of submaximal eccentric cycling
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7659479/
https://www.ncbi.nlm.nih.gov/pubmed/33105553
http://dx.doi.org/10.3390/ijerph17217702
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