چکیده مقاله
IntroductionFootball is a highly dynamic sport in which the lower limbs are exposed to substantial mechanical loads, and fatigue is recognized as a key factor influencing motor control strategies and injury risk However, limited evidence exists regarding the effect of fatigue on the nonlinear dynamics and complexity of knee joint kinematics in semi professional football players Therefore, the present study aimed to investigate the effect of fatigue on lower limb movement dynamics during running using sample entropy analysis of knee joint position time series MethodsThis semi experimental study employed a one group pre test–post test design Sixteen semi professional male football players mean age: ۱۹ ۵ years were recruited through convenience sampling Three dimensional kinematic data were collected using a Rapture H motion capture system with six infrared cameras operating at ۲۳۰ Hz Participants performed treadmill running at a speed of ۱۰ ۸ km/h under pre fatigue and post fatigue conditions Fatigue was induced using the Köbelbauer protocol Sample entropy was calculated from knee joint position time series to quantify movement complexity and irregularity ResultsPaired t test analysis revealed a statistically significant increase in sample entropy after fatigue pre fatigue: ۰ ۱۷; post fatigue: ۰ ۱۸; p = ۰ ۰۲۶ Although this increase was statistically significant, the magnitude of change was small, indicating minimal practical alteration in the running pattern Discussion and ConclusionThese findings suggest that fatigue induces only slight changes in the complexity of knee joint kinematics in semi professional football players The neuromuscular system likely employs compensatory mechanisms to preserve the stability and rhythmic structure of running under fatigue conditions Overall, the results highlight that statistical significance does not necessarily correspond to functional significance Furthermore, sample entropy can serve as a useful nonlinear tool for complementary assessment of movement control in sports biomechanics
کلیدواژهها
نویسندگان
Negin Iranmanesh
Department of Sports Pathology and Biomechanics, Faculty of Sport Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
Mahtab Farrokhi Parashkoh
Department of Sports Pathology and Biomechanics, Faculty of Sport Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
Mohammadreza Amirseyfaddini
Department of Sports Pathology and Biomechanics, Faculty of Sport Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
Sasan Naderi
Department of Sports Pathology and Biomechanics, Faculty of Sport Sciences, Shahid Bahonar University of Kerman, Kerman, Iran
شیوه ارجاع
Iranmanesh، Negin و Farrokhi Parashkoh، Mahtab و Amirseyfaddini، Mohammadreza و Naderi، Sasan،1405،Effects of Fatigue on Knee Joint Movement Complexity Based on Sample Entropy During Running in Semi-Professional Soccer Players،هفتمین همایش بین المللی تربیت بدنی ،سلامت و علوم ورزشی،همدان
ارائهشده در
مجموعه مقالات هفتمین همایش بین المللی تربیت بدنی ،سلامت و علوم ورزشی3 مرداد 1405 · همدان