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Paulus J, Pauls J, Radizzi L, Krecke L, Bury T, Goff CL, Laly A, Schwartz C, Forthomme B, Kaux JF, Croisier JL. Knee strength measurement: Can we switch between isokinetic dynamometers? ISOKINET EXERC SCI 2021. [DOI: 10.3233/ies-193193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND: Isokinetic evaluation is considered the gold standard in muscle strength measurement due to its sensitivity, intra-dynamometer reproducibility and usefulness in the injury prevention screening and follow up of subjects with musculoskeletal pathologies, neurological disease or after surgical operation. However, can one switch among different isokinetic dynamometers for the purpose of knee muscles evaluation? OBJECTIVES: To comprehensively evaluate the compatibility of the isokinetic short concentric and eccentric strength evaluation protocol and of the fatigability resistance evaluation between three different isokinetic devices. METHODS: Eighteen recreationally active men underwent three isokinetic knee testing sessions on three different isokinetic devices with 7–10 days of rest between each session. Relative (Pearson’s r product-moment correlation coefficient – PCC) and absolute (standard error of measurement – SEM, Cohen effect sizes (d) and probabilistic inferences – MBI) parameters of reproducibility were determined to assess the inter-dynamometer agreement. RESULTS: For the short concentric and eccentric strength evaluation protocol, the extensors in concentric mode and the flexors in eccentric mode can be compared (eventually with transposition formulas provided) between Biodex, Con-Trex and Cybex (almost all PCC ⩾ 0.80). The DCR could be compared between Con-Trex and Cybex and between Biodex and Cybex pairs (eventually with transposition formula provided). For the fatigability resistance evaluation protocol, the total sum can be compared for extensors (eventually with transposition formulas provided) for PM for all dynamometer pairs considered and, in the case of MW, only for Biodex and Con-Trex (PCC ⩾ 0.80). CONCLUSIONS: Only some of the parameters derived either from the short concentric and eccentric strength evaluation protocol or the fatigability resistance evaluation protocol may be interchangeable providing transposition formulas are applied. Otherwise, isokinetic findings are largely system-dependent save some specific instances.
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Affiliation(s)
- Julien Paulus
- Department of Motricity Sciences and Physical Therapy and Rehabilitation, University of Liege, Liege, Belgium
- Laboratory of Human Motion Analysis, Clinical University of Liege, Liege, Belgium
| | - Jerome Pauls
- Medical Luxembourg Olympic Centre, Clinical Centre of Sport and Orthopaedic, Luxemburg, Duchy of Luxemburg
| | - Laurent Radizzi
- Medical Luxembourg Olympic Centre, Clinical Centre of Sport and Orthopaedic, Luxemburg, Duchy of Luxemburg
| | - Laurent Krecke
- Medical Luxembourg Olympic Centre, Clinical Centre of Sport and Orthopaedic, Luxemburg, Duchy of Luxemburg
| | - Thierry Bury
- Department of Motricity Sciences and Physical Therapy and Rehabilitation, University of Liege, Liege, Belgium
| | - Caroline Le Goff
- Multidisciplinary Medical and Sports Traumatology Service (SPORTS2), CHU, Liege, Belgium
| | - Arnaud Laly
- Training Centre of the Ligue Belge Francophone de Rugby, Liege, Belgium
| | - Cédric Schwartz
- Laboratory of Human Motion Analysis, Clinical University of Liege, Liege, Belgium
| | - Bénédicte Forthomme
- Department of Motricity Sciences and Physical Therapy and Rehabilitation, University of Liege, Liege, Belgium
- Laboratory of Human Motion Analysis, Clinical University of Liege, Liege, Belgium
- Multidisciplinary Medical and Sports Traumatology Service (SPORTS2), CHU, Liege, Belgium
| | - Jean-François Kaux
- Multidisciplinary Medical and Sports Traumatology Service (SPORTS2), CHU, Liege, Belgium
| | - Jean-Louis Croisier
- Department of Motricity Sciences and Physical Therapy and Rehabilitation, University of Liege, Liege, Belgium
- Laboratory of Human Motion Analysis, Clinical University of Liege, Liege, Belgium
- Multidisciplinary Medical and Sports Traumatology Service (SPORTS2), CHU, Liege, Belgium
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Josephson MD, Knight CA. Comparison of neural excitation measures from the surface electromyogram during rate-dependent muscle contractions. J Electromyogr Kinesiol 2018; 44:15-20. [PMID: 30465942 DOI: 10.1016/j.jelekin.2018.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 11/01/2018] [Accepted: 11/08/2018] [Indexed: 12/01/2022] Open
Abstract
Peak power and peak rate of isometric force development (RFD) predict performance and functional mobility. Surface electromyography (EMG) is used to quantify the amplitude and rate of neuromuscular excitation. To inform the selection of EMG measures in research on rate-dependent muscle contractions, this methodological study compared amplitude-, area- and rate-based measures based on their correlations with RFD. Considering populations in whom a quiet EMG baseline is challenging, we included measures that do not require the determination of EMG onset. Twenty-one young adults performed isometric dorsiflexion contractions to 40% of their maximal force at increasing RFD. EMG was recorded from tibialis anterior. Relationships between EMG measures and RFD were quantified with Spearman's rho. RMS amplitude of the initial 75 ms of EMG had the strongest correlation with peak RFD (ρ = 0.80) among measures computed from EMG onset. Peak rate of EMG rise (RER) had the strongest relationship with peak RFD (ρ = 0.69) among measures that did not require determination of EMG onset. The strength of the relationship between RER and RFD and the strong correlation between RER and RMS75 during rapid contractions (ρ = 0.86) supports the use of RER in experiments where neural excitation might not be initiated from a quiet baseline.
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Affiliation(s)
- Micah D Josephson
- Shenandoah University, Department of Exercise Science, United States.
| | - Christopher A Knight
- University of Delaware, Department of Kinesiology and Applied Physiology, United States
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