Effect of Visual Feedback on Muscle Endurance in Normal Subjects

Abstract

Abstract. The measurement of maximum voluntary isokinetic contraction is a common practice in research and clinical settings. The purpose of this study was to investigate the effect of visual feedback on muscle endurance. Subjects were 22 male, between the ages of 18 and 31. Each subject had no history of lower extremity joint injury, surgery, or disease. All subjects completed two isokinetic exercise test sessions. The tests consisted of 50 maximum voluntary isokinetic contractions, using dynamometer (KIN-COM500H) at 90 degrees per second. All left lower extremities were measured. On endurance and effects fatigue index of visual feedback and no visual feedback were compared about every tenth average peak torque. On comparisions between with and without visual feedback were analyzed using a paired t-test. On average between 11th and 20th repetitions, average peak torque with visual feedback was significantly greater than without visual feedback (p<0.05). Excepting average torque between 11th and 20th repetition the results indicated no significant difference between with and without visual feedback. The fatigue index with feedback was not significantly different from that without visual feedback. These results suggest that visual feedback does not influence the fatigue index in measurements of muscle endurance.

Determination of subject-specific muscle fatigue rates under static fatiguing operations

“…MET can assess the ability to resist fatigue by measuring the maximal duration while exerting a force at a specific level until failure. A large amount of effort has been contributed to developing MET models for different muscle groups under different static working conditions (Rohmert, 1960(Rohmert, , 1973Rohmert et al, 1986;Bishu et al, 1995;Kanemura et al, 1999;Mathiassen and Ahsberg, 1999;Garg et al, 2002;Law and Avin, 2010). Although the MET models can predict the maximum endurance time under a given relative force level, the decrease in the muscular strength cannot be predicted directly by MET models.…”

The influence of electromyographic biofeedback therapy on knee extension following anterior cruciate ligament reconstruction: a randomized controlled trial

“…The literature has shown many EMG measurements, which were used as diagnostic [36,38-41] and/or therapy methods [25,31,42,43]. Selection of the vastus medialis muscle was based on Jarvela [44], who reported that the inferior fibres of vastus medialis are the most important for dynamic knee stability and the reduced load of passive knee structures.…”