Analysis of acceleration time of ankle in long-distance runners and triathletes

Abstract

INTRODUCTION:Adequate muscle reaction time is essential for protecting the joints against injuries during sports activities. This phenomenon of time of acceleration has been investigated through methodologies such as trapdoor experiments and electromyography. However, isokinetic analysis is an assessment method that is more dynamic and shows behavior closer to the functionality of the sport. Sports that involve running, such as long distance running and triathlon, have high lower-limb injury rates, particularly in relation to the ankle joint. The objective of this study was to evaluate and compare isokinetic acceleration and deceleration times of the dorsiflexor and plantar flexor musculature of the ankle in long-distance runners, triathletes and non-athletic individuals. METHOD: The sample comprised 75 individuals (men aged 18-42 years), divided into three groups: triathlete group, long-distance runner group and control group. The individuals were tested bilaterally on an isokinetic dynamometer. The evaluation modes used were (i) concentric/eccentric for plantar flexion and dorsiflexion, and (ii) eccentric/concentric for plantar flexion and dorsiflexion. We used (a) analysis of variance and Tukey's post hoc test; (b) Kruskal-Wallis and Müller-Dunn post hoc tsts; (c) Chi-square tests. RESULTS:The acceleration time during concentric contraction was statistically different only between the control group and the long-distance runner group, such that the controls presented faster acceleraton. CONCLUSION: This may signify a deficiency in their motor sensory control during concentric activity of the dorsiflexors.

Role of the Triceps Surae Muscles in Patients Undergoing Anterior Cruciate Ligament Reconstruction: A Matched Case-Control Study

“…The mechanism of muscle reaction is related to the arthrokinetic reflex, which is affected by velocity and acceleration [ 23 , 24 ]. Previous studies used methodologies such as trapdoor experiments and electromyography, but isokinetic analysis is a more dynamic assessment method and simulates a behavior that is closer to the sport activity [ 25 ]. Therefore, in this study, muscle reaction time was measured based on the AT in the isokinetic strength test.…”