title: Comparison of two methodological approaches for the mechanical analysis of single-joint isoinertial movement using a customised isokinetic dynamometer.
abstract: Compared to isokinetic and isometric tests, isoinertial movements have been poorly used to assess single-joint performance. Two calculation procedures were developed to estimate mechanical performance during single-joint isoinertial movements performed on a customised isokinetic dynamometer. The results were also compared to appreciate the effects of measurement systems and calculation procedures. Five participants performed maximal knee extensions at four levels of resistance (30, 50, 70 and 90% of the one-repetition maximum, 1-RM). Joint angular velocity and torque were assessed from customised isokinetic dynamometer measures (method A) and from weight stack kinematic (method B). Bland-Altman plots and mean percent differences (Mdiff) were used to assess the level of agreement for mean and peak angular velocity and torque. A Passing-Bablok regression was performed to compare the angular velocity-angle and torque-angle relationships computed from the two analysis methods. The results showed a high level of agreement for all mechanical parameters (Mdiff< 6% for all parameters). No statistically significant differences were observed between methods A and B in terms of angular velocity-angle and torque-angle relationships except at 30% of 1-RM for the torque-angle relationship. Both methodologies provide comparable values of angular velocity and torque, offering alternative approaches to assess neuromuscular function from single-joint isoinertial movements.
authors.affiliation: a Faculty of Sport Sciences, Movement, Interactions, Performance Laboratory , University of Nantes , Nantes , France.
authors.forename: Mathieu
authors.identifier: http://orcid.org/0000-0002-8799-5316
authors.initials: M
authors.lastname: Plautard
authors.affiliation: b Laboratory Sport, Expertise and Performance, Research Department , French National Institute of Sport , Paris , France.
authors.forename: Gaël
authors.initials: G
authors.lastname: Guilhem
authors.affiliation: c Qualisys AB , Göteborg , Sweden.
authors.forename: Vincent
authors.initials: V
authors.lastname: Fohanno
authors.affiliation: a Faculty of Sport Sciences, Movement, Interactions, Performance Laboratory , University of Nantes , Nantes , France.
authors.forename: Antoine
authors.initials: A
authors.lastname: Nordez
authors.affiliation: a Faculty of Sport Sciences, Movement, Interactions, Performance Laboratory , University of Nantes , Nantes , France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Cornu
authors.affiliation: a Faculty of Sport Sciences, Movement, Interactions, Performance Laboratory , University of Nantes , Nantes , France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Guével
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D004867:Equipment Design; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D009068:Movement; D009119:Muscle Contraction; D053581:Muscle Strength Dynamometer; D016059:Range of Motion, Articular; D055070:Resistance Training; D019415:Torque; D055815:Young Adult
keywords: Torque; angular velocity; isokinetic dynamometer; kinematic; leg extension