Mechanism of Fatigue Induced by Different Cycling Paradigms With Equivalent Dosage

Miao Ju Hsu; Hsiao Lung Chan; Ying Zu Huang; Jau Hong Lin; Heng Hsiang Hsu; Ya Ju Chang

doi:10.3389/fphys.2020.00545

Mechanism of Fatigue Induced by Different Cycling Paradigms With Equivalent Dosage

Miao Ju Hsu, Hsiao Lung Chan, Ying Zu Huang, Jau Hong Lin, Heng Hsiang Hsu, Ya Ju Chang^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal Article › peer-review

6 Scopus citations

Abstract

Leg cycling is one of the most common modes of exercise used in athletics and rehabilitation. This study used a novel cycling setting to elucidate the mechanisms, central vs. peripheral fatigue induced by different resistance with equivalent works (watt^∗min). Twelve male adults received low and relatively high resistance cycling fatigue tests until exhausted (RPE > 18) in 2 weeks. The maximal voluntary contraction, voluntary activation level, and twitch forces were measured immediately before and after cycling to calculate General (GFI), central (CFI), and peripheral (PFI) fatigue indices of knee extensors, respectively. The results showed that the CFI (high: 92.26 ± 8.67%, low: 78.32 ± 11.77%, p = 0.004) and PFI (high: 73.76 ± 17.32%, low: 89.63 ± 11.01%, p < 0.017) were specific to the resistance of fatigue protocol. The GFI is influenced by the resistance of cycling to support the equivalent dosage. This study concluded that the mechanism of fatigue would be influenced by the resistance of fatigue protocol although the total works had been controlled.

Original language	English
Article number	545
Journal	Frontiers in Physiology
Volume	11
DOIs	https://doi.org/10.3389/fphys.2020.00545
State	Published - 29 05 2020

Bibliographical note

Publisher Copyright:
© Copyright © 2020 Hsu, Chan, Huang, Lin, Hsu and Chang.

Keywords

bicycling
central fatigue
exercise
maximal voluntary contraction
peripheral fatigue

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10.3389/fphys.2020.00545

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title = "Mechanism of Fatigue Induced by Different Cycling Paradigms With Equivalent Dosage",

abstract = "Leg cycling is one of the most common modes of exercise used in athletics and rehabilitation. This study used a novel cycling setting to elucidate the mechanisms, central vs. peripheral fatigue induced by different resistance with equivalent works (watt∗min). Twelve male adults received low and relatively high resistance cycling fatigue tests until exhausted (RPE > 18) in 2 weeks. The maximal voluntary contraction, voluntary activation level, and twitch forces were measured immediately before and after cycling to calculate General (GFI), central (CFI), and peripheral (PFI) fatigue indices of knee extensors, respectively. The results showed that the CFI (high: 92.26 ± 8.67%, low: 78.32 ± 11.77%, p = 0.004) and PFI (high: 73.76 ± 17.32%, low: 89.63 ± 11.01%, p < 0.017) were specific to the resistance of fatigue protocol. The GFI is influenced by the resistance of cycling to support the equivalent dosage. This study concluded that the mechanism of fatigue would be influenced by the resistance of fatigue protocol although the total works had been controlled.",

keywords = "bicycling, central fatigue, exercise, maximal voluntary contraction, peripheral fatigue",

author = "Hsu, {Miao Ju} and Chan, {Hsiao Lung} and Huang, {Ying Zu} and Lin, {Jau Hong} and Hsu, {Heng Hsiang} and Chang, {Ya Ju}",

note = "Publisher Copyright: {\textcopyright} Copyright {\textcopyright} 2020 Hsu, Chan, Huang, Lin, Hsu and Chang.",

year = "2020",

month = may,

day = "29",

doi = "10.3389/fphys.2020.00545",

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AU - Hsu, Miao Ju

AU - Chan, Hsiao Lung

AU - Huang, Ying Zu

AU - Lin, Jau Hong

AU - Hsu, Heng Hsiang

AU - Chang, Ya Ju

PY - 2020/5/29

Y1 - 2020/5/29

N2 - Leg cycling is one of the most common modes of exercise used in athletics and rehabilitation. This study used a novel cycling setting to elucidate the mechanisms, central vs. peripheral fatigue induced by different resistance with equivalent works (watt∗min). Twelve male adults received low and relatively high resistance cycling fatigue tests until exhausted (RPE > 18) in 2 weeks. The maximal voluntary contraction, voluntary activation level, and twitch forces were measured immediately before and after cycling to calculate General (GFI), central (CFI), and peripheral (PFI) fatigue indices of knee extensors, respectively. The results showed that the CFI (high: 92.26 ± 8.67%, low: 78.32 ± 11.77%, p = 0.004) and PFI (high: 73.76 ± 17.32%, low: 89.63 ± 11.01%, p < 0.017) were specific to the resistance of fatigue protocol. The GFI is influenced by the resistance of cycling to support the equivalent dosage. This study concluded that the mechanism of fatigue would be influenced by the resistance of fatigue protocol although the total works had been controlled.

AB - Leg cycling is one of the most common modes of exercise used in athletics and rehabilitation. This study used a novel cycling setting to elucidate the mechanisms, central vs. peripheral fatigue induced by different resistance with equivalent works (watt∗min). Twelve male adults received low and relatively high resistance cycling fatigue tests until exhausted (RPE > 18) in 2 weeks. The maximal voluntary contraction, voluntary activation level, and twitch forces were measured immediately before and after cycling to calculate General (GFI), central (CFI), and peripheral (PFI) fatigue indices of knee extensors, respectively. The results showed that the CFI (high: 92.26 ± 8.67%, low: 78.32 ± 11.77%, p = 0.004) and PFI (high: 73.76 ± 17.32%, low: 89.63 ± 11.01%, p < 0.017) were specific to the resistance of fatigue protocol. The GFI is influenced by the resistance of cycling to support the equivalent dosage. This study concluded that the mechanism of fatigue would be influenced by the resistance of fatigue protocol although the total works had been controlled.

KW - bicycling

KW - central fatigue

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KW - peripheral fatigue

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Mechanism of Fatigue Induced by Different Cycling Paradigms With Equivalent Dosage

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