Effects of Fatigue Induced by Intermittent Running on Muscular Strength, Power, and Glycogen Content in Female Soccer Players
Year: 2017
Type: dissertation
Abstract: A majority of ACL injuries in female soccer players occur during the later stage of a game when fatigue is likely present. In a fatigued condition, reductions in the strength ratio of hamstrings to quadriceps and the lower extremity muscular strength and power can cause altered landing techniques that predispose female athletes to a higher risk of ACL injuries. Additionally, a significant reduction in the muscle glycogen content has been reported after a simulated soccer game. The current study investigates a role of the muscle glycogen content with knee strength and power in the presence of fatigue. Seventeen female subjects participated in the study (age:21.5±2.9yrs, height:166.9±7.2cm, and weight:63.7±6.6kg). Before and after an intermittent running protocol, subjects completed a battery of testing including maximal isokinetic knee flexion and extension muscular strength normalized to their body weight (%BW), a depth -jump onto a force plate to measure reactive strength index (RSI), and non-invasive ultrasound-based muscle glycogen content of six lower limb muscle groups. Based on normality, paired t-tests or Wilcoxon signed-rank test were performed to compare the strength, RSI, and muscle glycogen content pre- and post-fatigue. Additionally, correlation analyses were used to examine the relationships between the baseline muscle glycogen level and the changes (post/pre-fatigue values) in muscle glycogen content with the changes in muscular strength and power. Significance was set at p<0.05 a priori.
Author: Regina Stump
Language: English
Subfield: Orthopedics and Sports Medicine
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2762366593