Foundational Scientific Disciplines Flashcards

An elite athlete is competing in a 400-meter race, which they complete in approximately 50 seconds. Which energy system is the PRIMARY contributor to ATP resynthesis during this high-intensity event?

Answer: Anaerobic glycolysis

The 400-meter race is a maximal effort event lasting between 40-60 seconds. The phosphagen (ATP-PC) system is dominant for the first 10-15 seconds. After that, anaerobic glycolysis becomes the primary energy provider for activities lasting up to about 90 seconds. Aerobic glycolysis and beta-oxidation are too slow to meet the rapid energy demands of this event.

A novice athlete is learning the complex motor skill of a golf swing. According to motor learning principles, which type of feedback is generally MOST effective during these initial stages of skill acquisition?

Answer: Prescriptive and immediate feedback

During the early stages of learning, a novice benefits most from immediate feedback that is prescriptive, meaning it tells them what to do to correct an error. This direct guidance helps establish correct movement patterns before bad habits form. Bandwidth, summary, faded, and delayed feedback are more effective for intermediate or advanced learners as they encourage self-correction and reduce dependency on the coach.

During the downward (eccentric) phase of a traditional barbell back squat, which of the following accurately describes the primary action of the quadriceps muscle group?

Answer: Isotonic eccentric contraction

The downward phase of a squat involves the quadriceps lengthening under tension to control the descent against gravity. This action, where the muscle produces force while lengthening, is defined as an isotonic eccentric contraction. A concentric contraction occurs when the muscle shortens (the upward phase), an isometric contraction involves no change in muscle length, and an isokinetic contraction requires a constant speed of movement, typically with specialized equipment.

A professional tennis player reports feeling highly energized but also experiences excessive muscular tension and a narrow, internal focus of attention just before a major match. According to the Inverted-U Hypothesis, how would this state likely impact their performance?

Answer: It will likely lead to a performance decrement due to over-arousal.

The Inverted-U Hypothesis suggests that performance improves with arousal up to an optimal point, after which further increases in arousal lead to a decline. Symptoms like excessive muscular tension and a narrow internal focus are characteristic of over-arousal, placing the athlete beyond the optimal peak of the curve, which is expected to impair performance.

To optimize glycogen replenishment and muscle protein synthesis immediately following a strenuous resistance training session, what is the recommended composition of an athlete's post-exercise nutrition?

Answer: A combination of carbohydrates and protein.

Post-exercise nutrition should include a combination of carbohydrates and protein. Carbohydrates are crucial for replenishing depleted muscle glycogen stores, while protein provides the amino acids necessary for muscle repair and synthesis. Consuming them together can enhance glycogen storage and creates an anabolic environment. While simple carbs are useful, protein is also essential. Fats slow digestion, and BCAAs alone are not as effective as a complete protein source combined with carbohydrates.

An ice skater begins a spin with her arms extended horizontally and then pulls them in close to her body, causing her to spin much faster. Which fundamental principle of biomechanics explains this dramatic increase in rotational velocity?

Answer: Conservation of Angular Momentum

This phenomenon is a classic example of the conservation of angular momentum. Angular momentum is the product of moment of inertia and angular velocity. By pulling her arms in, the skater decreases her moment of inertia (how mass is distributed around the axis of rotation). Because angular momentum must be conserved in the absence of external torques, a decrease in moment of inertia must be compensated by a proportional increase in angular velocity (speed of spin).