In conclusion, we observed that, between kilometres 8 and 40,runners generally demonstrate increased stride length, contact time, peak hip flexion during swing, and peak knee flexion during swing, and decreased running speed, stride frequency, peak knee flexion during support and hip extension during swing. We believe that these changes were due to fatigue. In contradiction to our second hypothesis, the observed kinematics generally changed the same (between kilometres 8 and 40) for the fast and slow runners; however, the fast runners did exhibit a more consistent peak knee flexion during support throughout the race, relative to the slow runners. This may have been related more to the runners’ condition on race day. Runners should focus on resistance training which would be directed toward increases in both muscular strength and endurance of knee extensors. By so doing, peak knee flexion during support should be increased and be able to be maintained longer throughout the marathon
Kinematic changes during a marathon for fast and slow runnersed and be able to be maintained longer throughout the marathon
Kinetic Variables.................8K vs 40K difference
Stride length ..................... 1.3% increase
Contact time.......................13.1% increase
Peak knee flexion during support .. 3.2% decrease
Peak hip extension during swing ...27.9% decrease
Peak knee flexion during swing..... 4.3% increase
Peak hip flexion during swing ..... 7.4% increase
MY COMMENT: Knee extension? Haven't heard of that being recommended for runners in years. Interesting study. Who knew?
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