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Faster early rate of force development in a warmer muscle: an in vivo exploration of fascicle dynamics and muscle-tendon mechanical properties

American journal of physiology. Regulatory, integrative and comparative physiology, 2022-07, Vol.323 (1), p.R123-R132 [Peer Reviewed Journal]

Copyright American Physiological Society Jul 2022 ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0363-6119 ;ISSN: 0002-9513 ;EISSN: 1522-1490 ;EISSN: 2163-5773 ;DOI: 10.1152/ajpregu.00280.2021 ;PMID: 35579335

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  • Title:
    Faster early rate of force development in a warmer muscle: an in vivo exploration of fascicle dynamics and muscle-tendon mechanical properties
  • Author: Mornas, Adèle ; Racinais, Sebastien ; Brocherie, Franck ; Alhammoud, Marine ; Hager, Robin ; Desmedt, Yanis ; Guilhem, Gaël
  • Subjects: Dynamic mechanical properties ; Exposure ; Heat ; Human health and pathology ; Life Sciences ; Mechanical properties ; Muscle contraction ; Muscles ; Soft tissues ; Stiffness ; Tissues and Organs ; Velocity
  • Is Part Of: American journal of physiology. Regulatory, integrative and comparative physiology, 2022-07, Vol.323 (1), p.R123-R132
  • Description: While heat exposure has been shown to increase the rate of force development (RFD), the underlying processes remain unknown. This study investigated the effect of heat on gastrocnemius medialis (GM) muscle-tendon properties and interactions. Sixteen participants performed electrically-evoked and voluntary contractions combined with ultrafast ultrasound under thermoneutral (CON: 26°C, core temperature 37.0±0.3°C, muscle temperature 34.0±1.1°C) and passive heat exposure (HOT: 47°C, core temperature 38.4±0.3°C, muscle temperature 37.0±0.8°C) conditions. Maximal voluntary force was unchanged while voluntary activation decreased (-4.6±8.7%, P=0.038) in HOT. Heat exposure increased RFD before 100 ms from contraction onset (+48.2±62.7%; P=0.013), without further changes after 100 ms. GM fascicle dynamics during electrically-evoked and voluntary contractions remained unchanged between conditions. Joint velocity at a given force was higher in HOT (+7.1±6.6%; P=0.004), while the fascicle force-velocity relationship was unchanged. Passive muscle stiffness and active tendon stiffness were lower in HOT than CON (P≤0.030). This study showed that heat-induced increases in early RFD may not be attributed to changes in contractile properties. Late RFD was unaltered, probably explained by decreased soft tissues' stiffness in heat. Investigations are required to explore the possible influence of neural drive and motor unit recruitment in the enhancement of explosive strength elicited by heat exposure.
  • Publisher: United States: American Physiological Society
  • Language: English
  • Identifier: ISSN: 0363-6119
    ISSN: 0002-9513
    EISSN: 1522-1490
    EISSN: 2163-5773
    DOI: 10.1152/ajpregu.00280.2021
    PMID: 35579335
  • Source: Hyper Article en Ligne (HAL) (Open Access)
    Alma/SFX Local Collection
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