Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and Recovery
Our aim was to provide an in vivo assessment of human muscle twitch characteristics during and following an exhaustive dynamic exercise to explore temporal alterations of the rate of force development (RFD) and relaxation (RFR). Eleven healthy participants (mean age ± SD: 24 ± 3 years) completed a d...
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doaj-1975c582eb22481bbed845ee9a5179442021-07-02T05:11:56ZengFrontiers Media S.A.Frontiers in Physiology1664-042X2021-07-011210.3389/fphys.2021.660099660099Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and RecoveryFabrice Rannou0Fabrice Rannou1Lars Nybo2Janni Enghave Andersen3Nikolai B. Nordsborg4Department of Sport Medicine and Functional Explorations-ASMS, CRNH, CHU Clermont-Ferrand, Clermont-Ferrand, FranceDepartment of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, DenmarkDepartment of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, DenmarkDepartment of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, DenmarkDepartment of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, DenmarkOur aim was to provide an in vivo assessment of human muscle twitch characteristics during and following an exhaustive dynamic exercise to explore temporal alterations of the rate of force development (RFD) and relaxation (RFR). Eleven healthy participants (mean age ± SD: 24 ± 3 years) completed a dynamic knee-extensor exercise in randomized order at three different intensities, eliciting exhaustion after ∼9 min (56 ± 10 W), ∼6 min (60 ± 10 W), and ∼4 min (63 ± 10 W), in addition to a low-intensity (28 ± 5 W) bout. In a novel setup, an electrical doublet stimulation of m. vastus lateralis was applied during exercise (every 30 s) and recovery for frequent evaluation of key contractile properties (maximal force, RFD, RFR, and electromechanical delay) in addition to M-wave characteristics. RFD and RFR remained stable throughout the low-intensity trial but declined in all exhaustive trials to reach a similar level of ∼40% of pre-exercise values at task failure but with the exponential decay augmented by intensity. Following exhaustion, there was a fast initial recovery of RFD and RFR to ∼80% of pre-exercise values within 1 min, followed by a longer suppression at this level. The M-wave characteristics remained unchanged during all trials. In conclusion, this is the first study to quantify the intensity-dependent alterations of RFD and RFR during and after exhaustive dynamic exercise in humans. A hypothesized reduction and fast reversion of RFD was confirmed, and a surprising compromised RFR is reported. The present unique experimental approach allows for novel insight to exercise-induced alterations in human muscle contractile properties which is relevant in health and disease.https://www.frontiersin.org/articles/10.3389/fphys.2021.660099/fulldynamic exerciseintramuscular fatigueelectromechanical delayrates of force development and relaxationrecovery |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fabrice Rannou Fabrice Rannou Lars Nybo Janni Enghave Andersen Nikolai B. Nordsborg |
spellingShingle |
Fabrice Rannou Fabrice Rannou Lars Nybo Janni Enghave Andersen Nikolai B. Nordsborg Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and Recovery Frontiers in Physiology dynamic exercise intramuscular fatigue electromechanical delay rates of force development and relaxation recovery |
author_facet |
Fabrice Rannou Fabrice Rannou Lars Nybo Janni Enghave Andersen Nikolai B. Nordsborg |
author_sort |
Fabrice Rannou |
title |
Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and Recovery |
title_short |
Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and Recovery |
title_full |
Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and Recovery |
title_fullStr |
Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and Recovery |
title_full_unstemmed |
Muscle Contractile Characteristics During Exhaustive Dynamic Exercise and Recovery |
title_sort |
muscle contractile characteristics during exhaustive dynamic exercise and recovery |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Physiology |
issn |
1664-042X |
publishDate |
2021-07-01 |
description |
Our aim was to provide an in vivo assessment of human muscle twitch characteristics during and following an exhaustive dynamic exercise to explore temporal alterations of the rate of force development (RFD) and relaxation (RFR). Eleven healthy participants (mean age ± SD: 24 ± 3 years) completed a dynamic knee-extensor exercise in randomized order at three different intensities, eliciting exhaustion after ∼9 min (56 ± 10 W), ∼6 min (60 ± 10 W), and ∼4 min (63 ± 10 W), in addition to a low-intensity (28 ± 5 W) bout. In a novel setup, an electrical doublet stimulation of m. vastus lateralis was applied during exercise (every 30 s) and recovery for frequent evaluation of key contractile properties (maximal force, RFD, RFR, and electromechanical delay) in addition to M-wave characteristics. RFD and RFR remained stable throughout the low-intensity trial but declined in all exhaustive trials to reach a similar level of ∼40% of pre-exercise values at task failure but with the exponential decay augmented by intensity. Following exhaustion, there was a fast initial recovery of RFD and RFR to ∼80% of pre-exercise values within 1 min, followed by a longer suppression at this level. The M-wave characteristics remained unchanged during all trials. In conclusion, this is the first study to quantify the intensity-dependent alterations of RFD and RFR during and after exhaustive dynamic exercise in humans. A hypothesized reduction and fast reversion of RFD was confirmed, and a surprising compromised RFR is reported. The present unique experimental approach allows for novel insight to exercise-induced alterations in human muscle contractile properties which is relevant in health and disease. |
topic |
dynamic exercise intramuscular fatigue electromechanical delay rates of force development and relaxation recovery |
url |
https://www.frontiersin.org/articles/10.3389/fphys.2021.660099/full |
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