Isokinetics and Exercise Science - Volume 25, issue 4
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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: BACKGROUND: When various balance exercises are combined with strengthening or stretching exercises, the specific effects of any individual balance exercise are unclear. OBJECTIVE: The purpose of this study was to compare muscle activation and ratio in the quadriceps, hamstring, and gastrocnemius muscles in balance exercises. METHODS: In total, 20 healthy volunteers participated. The balance exercises consisted of standing on one-leg stand, a lunge, and trunk rotation. Electromyography data were collected from lateral quadriceps (LQ), lateral hamstring (LH), lateral gastrocnemius (LG), medial quadriceps (MQ), medial hamstring (MH), and medial gastrocnemius (MG). One-way repeated-measures analysis…of variance was used to assess the statistical significance of the muscle activation, muscle co-activation, and the muscle activation/co-activation ratio in the balance exercises. RESULTS: Compared with the other exercises, co-activation of the MQMH, LQLH, and LHLG increased significantly during the lunge (P < 0.05). During the lunge, the increase in LQLH and LHLG co-activation was significantly greater than that in MQMH and MHMG co-activation (P < 0.05). CONCLUSIONS: Co-activation of lateral muscles was greater than in the medial muscles during lunge exercises with repeated lunge exercise potentially causing lateral knee joint compression. Therefore, physical therapists and/or athletic trainers should pay specific attention to use of lunge exercise within the framework of balance exercise program.