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Effects of Hydrostatic-Pressure on Muscle Contraction: A Look Back on Some Experimental Findings

Ranatunga, K. W., Geeves, M. A. (2023) Effects of Hydrostatic-Pressure on Muscle Contraction: A Look Back on Some Experimental Findings. International Journal of Molecular Sciences, 24 (5). Article Number 5031. ISSN 1422-0067. (doi:10.3390/ijms24055031) (KAR id:100471)

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Findings from experiments that used hydrostatic pressure changes to analyse the process of skeletal muscle contraction are re-examined. The force in resting muscle is insensitive to an increase in hydrostatic pressure from 0.1 MPa (atmospheric) to 10 MPa, as also found for force in rubber-like elastic filaments. The force in rigour muscle rises with increased pressure, as shown experimentally for normal elastic fibres (e.g., glass, collagen, keratin, etc.). In submaximal active contractions, high pressure leads to tension potentiation. The force in maximally activated muscle decreases with increased pressure: the extent of this force decrease in maximal active muscle is sensitive to the concentration of products of ATP hydrolysis (Pi—inorganic phosphate and ADP—adenosine diphosphate) in the medium. When the increased hydrostatic pressure is rapidly decreased, the force recovered to the atmospheric level in all cases. Thus, the resting muscle force remained the same: the force in the rigour muscle decreased in one phase and that in active muscle increased in two phases. The rate of rise of active force on rapid pressure release increased with the concentration of Pi in the medium, indicating that it is coupled to the Pi release step in the ATPase-driven crossbridge cycle in muscle. Pressure experiments on intact muscle illustrate possible underlying mechanisms of tension potentiation and causes of muscle fatigue.

Item Type: Article
DOI/Identification number: 10.3390/ijms24055031
Uncontrolled keywords: Inorganic Chemistry, Organic Chemistry, Physical and Theoretical Chemistry, Computer Science Applications, Spectroscopy, Molecular Biology, General Medicine, Catalysis
Subjects: Q Science
Q Science > QH Natural history
Q Science > QH Natural history > QH301 Biology
Divisions: Divisions > Division of Natural Sciences > Biosciences
Funders: University of Kent (
SWORD Depositor: JISC Publications Router
Depositing User: JISC Publications Router
Date Deposited: 15 Mar 2023 14:45 UTC
Last Modified: 05 Apr 2023 13:44 UTC
Resource URI: (The current URI for this page, for reference purposes)
Geeves, M. A.:
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