Isokinetics and Exercise Science - Volume 8, issue 1
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Isokinetics and Exercise Science (IES) is an international journal devoted to the study of theoretical and applied aspects of human muscle performance. Since isokinetic dynamometry constitutes the major tool in this area, the journal takes a particular interest in exploring the considerable potential of this technology.
Isokinetics and Exercise Science publishes studies associated with the methodology of muscle performance especially with respect to the issues of reproducibility and validity of testing, description of normal and pathological mechanical parameters which are derivable from muscle testing, applications in basic research topics such as motor learning paradigms and electromyography. The journal also publishes studies on applications in clinical settings and technical aspects of the various measurement systems employed in human muscle performance research.
Isokinetics and Exercise Science welcomes submissions in the form of research papers, reviews, case studies and technical reports from professionals in the fields of sports medicine, orthopaedic and neurological rehabilitation and exercise physiology.
Abstract: The purpose of this study was to determine the effect of visual feedback and verbal encouragement on concentric peak torque of the quadriceps and hamstrings muscles of males and females at an isokinetic velocity of 60~deg/s. All testing was performed on the Biodex B-2000 isokinetic dynamometer in three sessions, separated by 7 to 14 days. Fifteen males and 15 females (age = 25.4 \pm 2.4 yrs, wt = 76.6 \pm 16.5 kg,…ht = 173.61 \pm 9.5 cm) were tested under the following conditions: (a) visual feedback, (b) verbal encouragement, (c) combined visual feedback and verbal encouragement, and (d) no feedback (control). Testing order was counterbalanced to control for possible learning effects. Two separate 2 \times 4 repeated measure analyses of variance (ANOVA) were used to examine the difference among test conditions. Examination of quadriceps force production revealed that subjects generated greater peak torque when visual feedback was provided than when verbal encouragement or no feedback were provided. Similarly, quadriceps force production was greater when combined visual feedback and verbal encouragement was provided than when verbal encouragement or no feedback were provided (p<0.05). Examination of hamstrings force production revealed that subjects generated greater peak torque when combined visual feedback and verbal encouragement was provided than when verbal encouragement, and no feedback were provided. Additionally, hamstrings force production was greater when visual feedback was provided than when no feedback was provided (p<0.05). These results indicate that the use of visual and combined visual and verbal feedback increased quadriceps and hamstrings force production when compared to the control condition where no feedback was provided.
Abstract: Isokinetic testing of arm elevation in the scapular plane offers several advantages over the frontal plane. The purpose of this investigation was to determine the intraexaminer reproducibility of scapular plane (30^\circ anterior to frontal plane) elevation peak torques using a Cybex 340 isokinetic dynamometer. Twelve female and three male (N=15) noninjured college students were tested on three separate occasions over a six week interval. Dominant shoulder scapular plane elevation was measured with…participants seated utilizing a modified abduction/adduction protocol. Testing consisted of four gradient sub-maximum to maximum warm-ups followed by five maximum repetitions at 60^\circ /sec, 180^\circ /sec, and 300^\circ /sec. Intraclass correlation coefficients (ICCs) indicated that scapular plane elevation peak torques may be measured using these techniques with good reproducibility at 60^\circ /sec (0.870) and 180^\circ /sec (0.827), and fair reproducibility at 300^\circ /sec (0.708). Results suggest that scapular plane arm elevation isokinetic testing should be conducted at slower angular-velocities to obtain more reproducible measurements.