Publications

Authors:

Monte, Andrea; Zignoli, Andrea

Title:

Muscle and tendon stiffness and belly gearing positively correlate with rate of torque development during explosive fixed end contractions

Year:

2021

Type of item:

Articolo in Rivista

Tipologia ANVUR:

Articolo su rivista

Language:

Inglese

Format:

A Stampa

Referee:

Sì

Name of journal:

JOURNAL OF BIOMECHANICS

ISSN of journal:

0021-9290

N° Volume:

114

Number or Folder:

110110

Page numbers:

1-7

Keyword:

architectural gear ratio; electromyography; fixed-end contraction; skeletal muscle; ultrafast ultrasound

Short description of contents:

We combined ultrafast-ultrasound with dynamometric measurements to assess the associations between muscle structural properties and the rate of torque development (RTD) during isometric explosive fixed-end plantar flexor contractions. The torque-time signal was recorded for the plantaflexor muscles in fifteen men and the peak value of RTD was obtained. Tendon stiffness (kT) and muscle stiffness (kM) of the Gastrocnemius Medialis (GM) were assessed during maximal isometric voluntary contractions (MVC) and quick release using ultrafast ultrasound (1000 Hz). During the explosive contraction, the GM geometrical changes were recorded and the belly gearing (belly velocity/fascicle velocity) was calculated. Pearson's correlation coefficient was used to assess the correlation between variables, whereas equality of correlation coefficients between RTD and kT and kM was tested by means of the Hotelling's statistics. During explosive contraction, kT was higher than kM (~55 and ~30 N⋅mm-1, respectively). RTD positively correlated with kM (r = 0.75, p < 0.001), kT (r = 0.58, p = 0.044) and belly gearing (r = 0.78, p < 0.001). However, Hotelling's test showed no significant differences between the correlation coefficients between RTD and muscle and tendon stiffness. Further, belly gearing was significantly positively correlated with kM only (r = 0.79, p < 0.001). Our data suggest that muscle and tendon stiffness are similarly associated with RTD. Given the association with belly gearing, muscle stiffness seems to play an important role in determining the muscle length changes, thereby affecting the muscle force transmission capacity during the transient phases.

Web page:

https://doi.org/10.1016/j.jbiomech.2020.110110

Product ID:

118316

Handle IRIS:

11562/1032224

Last Modified:

November 15, 2022

Bibliographic citation:

Monte, Andrea; Zignoli, Andrea, Muscle and tendon stiffness and belly gearing positively correlate with rate of torque development during explosive fixed end contractions «JOURNAL OF BIOMECHANICS» , vol. 114 , n. 110110 , 2021 , pp. 1-7

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