Abstract
In this study, it was hypothesized that the peak torque reliability would depend on the type of muscular action. The aim of this study was to analyze and to compare the reliability of isometric peak torque (IPT) and isokinetic peak torque at speeds of 60o.s-1 and 180o.s-1 (CPT60 and CPT180, respectively) of elbow flexors (EF) and elbow extensors (EE) muscles in trained swimmers. Twenty trained male swimmers (23 ± 5 years) performed the following protocols in different days: 1) Familiarization to isokinetic dynamometer; 2) Two maximal isometric voluntary contractions to determine IPT and five maximal concentric isokinetic contractions at 60o.s-1and 180o.s-1 to determine CPT60 and CPT180, respectively (T1). The tests for IPT, CPT60 and CPT180 determination were performed in random order, and; 3) The same tests were performed in the same order of those performed on the second day (T2). There was no significant difference of IPT, CPT60 and CPT180 values between T1 and T2. Higher intraclass correlation coefficient (ICC) and lower typical error (TE) of IPT (ICC - 0.87 - 0.92; TE - 6.9 - 10.9%) in relation to CPT60 (CCI - 0.66 - 0.79, TE - 12.0 - 12.8%) and CPT180 (ICC - 0.85 - 0.85; TE - 8.5 - 9.2%) was observed. Based on these results, it could be concluded that the peak torque of EF and EE muscles presents moderate to excellent reliability, and can be influenced by the type of muscular action performed by trained swimmers.
Highlights
The use of isokinetic dynamometer has helped in understanding the neuromuscular response to exercise, since it is carried out under well-controlled conditions and can be used for different purposes[1]
No significant differences were observed in isometric peak torque (IPT), CPT60 and CPT180 of elbow flexors (EF) and EE muscles between tests 1 (T1) and T2 (p> 0.05)
Based on the Intraclass correlation coefficient (ICC), it was found that IPT and CPT180 showed excellent reproducibility, while for CPT60, reproducibility was moderate to excellent (Figure 3)
Summary
The use of isokinetic dynamometer has helped in understanding the neuromuscular response to exercise, since it is carried out under well-controlled conditions (speed, body position) and can be used for different purposes (sports and clinical)[1]. This dynamometer allows the muscle torque to be measured in the different joints in an isometric (with different joint angles), concentric and eccentric forms (at different speeds)[2,3]. There are no studies that have investigated the reproducibility of the peak torque of EF and EE muscles in different muscular actions and angular velocities of trained swimmers
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