Based on the three studies, what can be observed about the role of local muscular fatigue on 20-yard sprint performance?

Researchers studied sprinting ability to better understand differences between individuals in performance. After completion of the first study, researchers performed two follow up studies to explore the movement economy of and physiological response to sprinting. The same five subjects were used for each study.

Study 1

Five healthy adult subjects with similar body weight and height were familiarized with the sprinting technique. Each subject was instructed to sprint as fast as they could in a linear path for 20 yards. Infrared timing gates were placed at 5 yards (G1), 10 yards (G2), 15 yards (G3), and 20 yards (G4) into the route to record timing and later extrapolate speed.

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Study 2

The five healthy adult subjects from Study 1 were instructed to sprint as fast as they could in a linear path for 15 yards. An in-ground force plate was inserted on the route at the 10-yard point with the capacity to measure peak propulsive and braking forces in newtons. Propulsive forces have vectors in the +y direction and contribute to acceleration while sprinting. Braking forces have vectors in the -y direction and contribute to deceleration while sprinting.

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Study 3

The five healthy adult subjects from Study 1 and Study 2 were instructed to sprint as fast as they could in a linear path until they could no longer do so. Immediately after completion of their route blood samples were extracted from subjects. Blood samples were analyzed to measure concentration of blood lactate: larger quantities are a known biomarker for muscular fatigue.

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The fastest sprinters demonstrate more local muscular fatigue after sprinting according to blood lactate concentration.

The fastest sprinters demonstrate less local muscular fatigue after sprinting according to blood lactate concentration.

The fastest sprinters demonstrate more local muscular fatigue after sprinting according to peak propulsive forces produced.

The fastest sprinters demonstrated less local muscular fatigue after sprinting according to peak braking forces produced.

(B) The fastest sprinters demonstrate less local muscular fatigue after sprinting according to blood lactate concentration. Because the question refers to 20-yard sprint performance only consider the sprinters times at G4. Those with the fastest times have the lowest blood lactate concentrations, and those with the slowest times have the highest.

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