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NCAA PPL Human Performance study materials
NCAA PPL Human Performance study resources

NCAA PPL Human Performance practice questions

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Question 1Human Performance Foundations

In the context of NCAA performance psychology, which term describes the athlete's ability to maintain focus on task-relevant cues while ignoring distractions during competition?

  1. Self-efficacy
  2. Intrinsic motivation
  3. Arousal regulation
  4. Attentional control Correct answer.

Explanation

Attentional control refers specifically to directing and sustaining focus on relevant cues while filtering irrelevant stimuli. The other terms describe different constructs: arousal regulation concerns activation level, self-efficacy concerns confidence in capability, and intrinsic motivation concerns internal drive.

Question 2Human Performance Foundations

A sprinter reports feeling 'pumped up' before races and performs best at high activation, while a golfer performs best when calm. This difference best illustrates which principle of arousal and performance?

  1. Drive theory
  2. The inverted-U hypothesis
  3. The catastrophe model
  4. The individual zones of optimal functioning Correct answer.

Explanation

Individual zones of optimal functioning (IZOF) holds that each athlete has a personal band of arousal at which performance peaks, which can sit high or low. The inverted-U assumes one universal optimal point, and drive theory predicts linear improvement with arousal.

Question 3Human Performance Foundations

Which physiological response is the most direct marker of sympathetic nervous system activation during pre-competition anxiety?

  1. Reduced muscle tension
  2. Elevated salivary cortisol
  3. Decreased resting heart rate
  4. Increased heart rate and respiration Correct answer.

Explanation

Sympathetic activation rapidly increases heart rate, respiration, and blood flow to skeletal muscle as part of the fight-or-flight response. Cortisol is a slower hormonal stress marker, and sympathetic arousal raises rather than lowers heart rate and muscle tension.

Question 4Human Performance Foundations

A coach teaches an athlete to systematically tense and then release muscle groups while attending to the difference in sensation. This technique is best identified as:

  1. Autogenic training
  2. Systematic desensitization
  3. Progressive muscle relaxation Correct answer.
  4. Biofeedback training

Explanation

Progressive muscle relaxation involves deliberate cycles of tensing and releasing muscle groups to heighten awareness of tension and promote relaxation. Systematic desensitization pairs relaxation with graded anxiety-provoking stimuli, biofeedback uses instrumented physiological signals, and autogenic training relies on self-suggested warmth and heaviness.

Question 5Human Performance Foundations

An athlete mentally rehearses a basketball free throw in real time, imagining the feel of the ball and the gym environment. This practice is best described as:

  1. External visual imagery
  2. Self-talk
  3. Goal setting
  4. Internal kinesthetic imagery Correct answer.

Explanation

Internal imagery is experienced from the athlete's own perspective and can include kinesthetic sensations such as the feel of the movement. External imagery views the performance as an observer, while self-talk and goal setting are separate psychological skills.

Question 6Human Performance Foundations

According to Bandura's self-efficacy theory, which source is generally considered the most powerful for building an athlete's confidence?

  1. Verbal persuasion
  2. Physiological state
  3. Vicarious experience
  4. Mastery experiences Correct answer.

Explanation

Bandura identified mastery experiences, or successful past performances, as the strongest source of self-efficacy because they provide direct evidence of capability. Vicarious experience, verbal persuasion, and interpretation of physiological states are influential but generally weaker.

Question 7Human Performance Foundations

A team sets the goal of 'winning the conference championship' for the season. In goal-setting theory, this goal is best classified as:

  1. A process goal
  2. A mastery goal
  3. A performance goal
  4. An outcome goal Correct answer.

Explanation

Outcome goals focus on competitive results relative to others, such as winning a title. Performance goals target personal standards independent of opponents, process goals target execution behaviors, and mastery goals emphasize learning and skill improvement.

Question 8Human Performance Foundations

Which statement best reflects the multidimensional model of sport confidence, in which confidence varies by domain?

  1. Confidence is a single global trait that is stable across all situations.
  2. Confidence is determined solely by competitive level.
  3. Confidence cannot be developed after adolescence.
  4. An athlete can be highly confident in one area, such as conditioning, while doubting another, such as decision-making. Correct answer.

Explanation

The multidimensional model holds that confidence is domain-specific, so an athlete may feel strong in physical conditioning but uncertain about decision-making or resilience. It is not a single global trait, is influenced by many sources, and can be developed throughout a career.

Question 9Human Performance Foundations

In attribution theory as applied to sport, an athlete who attributes a loss to 'lack of effort' is making which type of attribution?

  1. External and stable
  2. Internal and stable
  3. External and unstable
  4. Internal and unstable Correct answer.

Explanation

Effort is an internal factor controlled by the athlete, and it can vary from contest to contest, making it unstable. Ability would be internal and stable, while luck or opponent quality would be external.

Question 10Human Performance Foundations

Which behavior most clearly exemplifies task-oriented (mastery-oriented) motivation in a collegiate athlete?

  1. Choosing opponents known to be weaker
  2. Seeking recognition from the media
  3. Focusing on improving technique regardless of the scoreboard Correct answer.
  4. Comparing personal statistics with a teammate's

Explanation

Task orientation emphasizes personal improvement and mastery of skill rather than comparison with others. Comparing statistics, seeking recognition, and selecting weak opponents reflect ego orientation focused on outperforming others or appearing competent.

Question 11Human Performance Foundations

Which of the following is a cognitive anxiety symptom rather than a somatic one?

  1. Butterflies in the stomach
  2. Racing heart
  3. Sweaty palms
  4. Worry about failing Correct answer.

Explanation

Cognitive anxiety involves mental components such as worry, apprehension, and negative thoughts about performance. Somatic anxiety refers to perceived physiological symptoms like sweating, elevated heart rate, and gastrointestinal sensations.

Question 12Human Performance Foundations

A coach wants to reduce an athlete's pre-game cognitive anxiety by restructuring negative self-statements into more realistic, task-focused ones. This technique is known as:

  1. Biofeedback
  2. Cognitive restructuring Correct answer.
  3. Tapering
  4. Progressive muscle relaxation

Explanation

Cognitive restructuring involves identifying and replacing maladaptive thoughts with more accurate, adaptive appraisals. Progressive muscle relaxation and biofeedback target physiological arousal, and tapering is a training-load reduction strategy.

Question 13Human Performance Foundations

Which statement about the relationship between self-talk and performance is most consistent with current sport psychology evidence?

  1. Only positive self-talk improves performance.
  2. Negative self-talk always improves performance by increasing urgency.
  3. Instructional and motivational self-talk can both aid performance, with effects depending on the task and the individual. Correct answer.
  4. Self-talk has no measurable effect on motor performance.

Explanation

Research indicates both instructional self-talk, which cues technique, and motivational self-talk, which builds confidence and effort, can benefit performance, with effectiveness varying by task and athlete. Claims that only positive self-talk works or that self-talk has no effect are not supported.

Question 14Human Performance Foundations

A distance runner reports worry and a racing heart before a major race, and the coach interprets these as 'readiness' rather than 'threat.' This reframing best illustrates which concept?

  1. Somatic relaxation
  2. Learned helplessness
  3. Arousal reappraisal Correct answer.
  4. Attentional narrowing

Explanation

Arousal reappraisal involves reinterpreting physiological arousal as functional and facilitative rather than debilitative, which can improve performance. Attentional narrowing is a perceptual effect of arousal, somatic relaxation reduces physiological tension, and learned helplessness concerns perceived lack of control.

Question 15Human Performance Foundations

Which factor most directly supports the development of team cohesion according to the conceptual model of cohesion in sport?

  1. Clear role clarity and shared team goals Correct answer.
  2. Rapid turnover of team members
  3. Frequent changes in team leadership
  4. Avoidance of interpersonal communication

Explanation

Cohesion is supported by factors such as clear roles, shared goals, effective communication, and stable team membership. High turnover, leadership instability, and poor communication tend to undermine both task and social cohesion.

Question 16Human Performance Foundations

In the study of leadership in sport, a coach who makes all decisions and dictates team strategy without player input is demonstrating which leadership style?

  1. Transformational
  2. Autocratic Correct answer.
  3. Democratic
  4. Laissez-faire

Explanation

Autocratic leadership centralizes decision-making in the coach with little athlete input. Democratic leadership invites participation, laissez-faire leadership is hands-off, and transformational leadership inspires development and shared vision.

Question 17Human Performance Foundations

Which statement best describes the relationship between intrinsic motivation and extrinsic rewards according to self-determination theory?

  1. Intrinsic motivation is independent of psychological needs.
  2. Intrinsic motivation disappears once an athlete receives any reward.
  3. Extrinsic rewards always increase intrinsic motivation.
  4. Controlling extrinsic rewards can undermine intrinsic motivation, whereas informational rewards may support it. Correct answer.

Explanation

Self-determination theory holds that controlling rewards can reduce intrinsic motivation by shifting perceived locus of causality, while informational rewards that support competence can preserve or enhance it. Intrinsic motivation is also supported by satisfaction of autonomy, competence, and relatedness needs.

Question 18Human Performance Foundations

An athlete who repeatedly explains poor results as caused by factors outside personal control and likely to persist may be at risk of which psychological pattern?

  1. Flow state
  2. Learned helplessness Correct answer.
  3. Peak performance
  4. Self-handicapping

Explanation

Learned helplessness arises when individuals attribute failure to stable, uncontrollable causes and come to expect that effort will not change outcomes. Flow and peak performance are optimal states, and self-handicapping involves creating obstacles to protect self-esteem.

Question 19Human Performance Foundations

Which measure is most appropriate for assessing an athlete's perceived somatic and cognitive anxiety using a validated sport-specific instrument?

  1. A team satisfaction survey
  2. A general personality inventory
  3. A sport-specific anxiety questionnaire such as one measuring cognitive and somatic components Correct answer.
  4. A physical fitness test

Explanation

Sport-specific anxiety questionnaires are designed to measure cognitive and somatic anxiety components in athletic contexts and have established validity. General personality inventories, fitness tests, and satisfaction surveys do not target competitive anxiety constructs.

Question 20Human Performance Foundations

Which statement best characterizes the concept of flow as described in sport psychology?

  1. A state of complete absorption in which challenge and skill are balanced Correct answer.
  2. A state of low motivation and disengagement
  3. A state of chronic overtraining
  4. A state of heightened self-consciousness about performance

Explanation

Flow is an optimal experiential state marked by deep absorption, clear goals, immediate feedback, and a balance between perceived challenge and skill. It involves reduced self-consciousness rather than heightened self-focus.

Question 21Human Performance Foundations

A coach notices an athlete's performance deteriorates sharply only when cognitive anxiety is very high, with a sudden drop rather than a gradual decline. This pattern is most consistent with which model?

  1. Drive theory
  2. Catastrophe model Correct answer.
  3. Inverted-U hypothesis
  4. Reversal theory

Explanation

The catastrophe model predicts that when cognitive anxiety is high, increases in physiological arousal can produce an abrupt, catastrophic drop in performance rather than a smooth decline. Drive theory predicts linear change, the inverted-U predicts a gradual curve, and reversal theory focuses on interpretation of arousal.

Question 22Human Performance Foundations

Which of the following best describes the role of periodization in supporting an athlete's psychological readiness across a season?

  1. It guarantees consistent arousal levels in every contest.
  2. It replaces psychological skills training entirely.
  3. It structures training and recovery phases to manage fatigue and peak appropriately for key competitions. Correct answer.
  4. It eliminates all stress from training.

Explanation

Periodization organizes training into phases with planned variation in volume and intensity, including recovery, to manage fatigue and optimize readiness for key competitions. It does not eliminate stress, replace psychological skills, or guarantee uniform arousal.

Question 23Human Performance Foundations

Which psychological skill is most directly aimed at helping an athlete shift attention from irrelevant thoughts to task-relevant cues during competition?

  1. Progressive muscle relaxation
  2. Attentional cueing and refocusing strategies Correct answer.
  3. Goal setting for the season
  4. Team-building exercises

Explanation

Attentional cueing and refocusing strategies teach athletes to identify relevant cues and return attention to them after distraction. Relaxation targets arousal, seasonal goal setting targets long-term direction, and team building targets group cohesion.

Question 24Human Performance Foundations

An athlete consistently performs well in practice but underperforms in competition, reporting fear of evaluation. Which intervention target is most directly indicated by this pattern?

  1. Changing the athlete's sport
  2. Addressing evaluation apprehension and building competition-specific confidence Correct answer.
  3. Increasing training volume
  4. Reducing team communication

Explanation

A practice-to-competition gap tied to fear of evaluation points to evaluation apprehension and confidence as primary targets. Interventions such as cognitive restructuring, imagery, and graded competitive exposure address these factors, whereas training volume, changing sports, or reducing communication do not directly address the appraisal.

Question 25Human Performance Foundations

Which statement best captures the distinction between state and trait anxiety in sport psychology?

  1. State anxiety is a stable personality disposition, while trait anxiety is momentary.
  2. State anxiety is a momentary emotional response, while trait anxiety is a relatively stable tendency to perceive situations as threatening. Correct answer.
  3. Both terms describe the same stable disposition.
  4. Trait anxiety only occurs before competition.

Explanation

State anxiety refers to a temporary emotional reaction experienced at a particular moment, whereas trait anxiety is a relatively enduring disposition to appraise situations as threatening. The two are distinct, and trait anxiety is not limited to pre-competition contexts.

Question 26Human Performance Foundations

In the multidimensional model of anxiety, which component of competitive anxiety is most closely associated with physiological arousal such as increased heart rate and muscle tension?

  1. Cognitive anxiety
  2. State self-confidence
  3. Somatic anxiety Correct answer.
  4. Trait anxiety

Explanation

Somatic anxiety refers to the physiological and affective components of anxiety, including perceived arousal such as rapid heartbeat, sweating, and muscle tension. Cognitive anxiety, by contrast, involves worry and negative expectations. State self-confidence is a separate construct reflecting belief in one's ability at a given moment.

Question 27Human Performance Foundations

An athlete tells the coach, 'I know I can execute this skill because I have done it in practice many times.' According to Bandura's self-efficacy theory, which source of efficacy information is this athlete primarily relying on?

  1. Vicarious experience
  2. Verbal persuasion
  3. Interpretation of arousal
  4. Past performance accomplishments Correct answer.

Explanation

Performance accomplishments, also called mastery experiences, are the most influential source of self-efficacy because they provide direct evidence of one's capability. The athlete's reference to having successfully performed the skill in practice reflects this source. Vicarious experience involves observing others, verbal persuasion involves encouragement from others, and interpretation of arousal involves reading physiological states.

Question 28Human Performance Foundations

A coach sets a goal for a volleyball team to 'improve serving accuracy by 15% over the next six weeks, as measured by the number of serves landing in designated target zones during practice.' In goal-setting theory, this goal is best described as:

  1. Outcome-oriented and vague
  2. Performance-oriented and measurable Correct answer.
  3. Process-oriented and subjective
  4. Arousal-based and non-specific

Explanation

Performance goals focus on improving one's own previous standards and are typically measurable, as seen in the specific 15% improvement and the defined measurement method. Outcome goals focus on comparing against opponents, while process goals focus on executing specific techniques. This goal is neither vague nor subjective because it includes a precise metric and assessment procedure.

Question 29Human Performance Foundations

Which statement best describes the relationship between self-talk and performance according to current sport psychology research?

  1. Self-talk has no measurable effect on performance.
  2. Positive self-talk always improves performance regardless of context.
  3. Negative self-talk is always harmful and should be eliminated entirely.
  4. Self-talk influences performance through cognitive and motivational mechanisms, with effects depending on content and context. Correct answer.

Explanation

Research indicates that self-talk can enhance performance by directing attention, regulating effort, and shaping appraisals, but its effectiveness depends on factors such as the content, timing, and individual characteristics. It is not universally beneficial or harmful. Therefore, the most accurate statement is that self-talk influences performance through multiple mechanisms with context-dependent effects.

Question 30Human Performance Foundations

A coach wants to enhance an athlete's intrinsic motivation for training. According to self-determination theory, which coaching behavior is most likely to support intrinsic motivation?

  1. Providing tangible rewards for every completed workout
  2. Comparing the athlete's performance to teammates publicly
  3. Offering choices and rationale that support autonomy Correct answer.
  4. Using controlling language that emphasizes external pressure

Explanation

Self-determination theory posits that intrinsic motivation is supported when the needs for autonomy, competence, and relatedness are met. Autonomy-supportive behaviors, such as offering choices and providing meaningful rationales, foster intrinsic motivation. In contrast, tangible rewards, controlling language, and social comparison tend to undermine intrinsic motivation by shifting focus to external factors.

Question 31Energy Systems and Metabolism

Which energy system resynthesizes ATP most rapidly during a maximal 5-second sprint?

  1. The fast glycolytic system using glycogen
  2. The oxidative system using the Krebs cycle
  3. The electron transport chain using oxygen
  4. The phosphagen system using creatine kinase Correct answer.

Explanation

The phosphagen (ATP-CP) system uses creatine kinase to transfer a phosphate from creatine phosphate to ADP, regenerating ATP almost instantly. It dominates the first several seconds of maximal effort before glycolysis and oxidation contribute meaningfully.

Question 32Energy Systems and Metabolism

Roughly how much ATP does the complete oxidation of one glucose molecule yield through substrate-level phosphorylation and oxidative phosphorylation combined?

  1. 30 to 32 ATP Correct answer.
  2. 4 ATP
  3. 100 ATP
  4. 2 ATP

Explanation

Modern estimates place complete glucose oxidation at approximately 30 to 32 ATP when accounting for transport costs of NADH and FADH2. Glycolysis alone yields a net of 2 ATP, so the full pathway multiplies that many times over.

Question 33Energy Systems and Metabolism

During steady-state aerobic exercise, which fuel provides the largest share of ATP production in a well-fed athlete?

  1. Intramuscular ATP stores
  2. Muscle creatine phosphate
  3. Blood glucose only
  4. Fatty acids via beta-oxidation Correct answer.

Explanation

At steady aerobic intensities, fatty acid oxidation supplies the majority of ATP because fat stores are large and beta-oxidation feeds acetyl-CoA into the Krebs cycle. Carbohydrate contributes but is proportionally smaller at moderate intensities.

Question 34Energy Systems and Metabolism

Which molecule serves as the final electron acceptor in the electron transport chain?

  1. NAD+
  2. Lactate
  3. Pyruvate
  4. Oxygen Correct answer.

Explanation

Oxygen accepts electrons at cytochrome oxidase, forming water and allowing the chain to keep passing electrons. Without oxygen the chain backs up and oxidative ATP production halts.

Question 35Energy Systems and Metabolism

What is the primary fate of lactate produced in fast-twitch fibers during moderate exercise?

  1. It is transported to oxidative fibers and the heart for oxidation Correct answer.
  2. It is converted directly into creatine phosphate
  3. It is stored permanently in the muscle as fat
  4. It is excreted unchanged in urine

Explanation

Lactate is a valuable fuel that shuttles through the bloodstream to oxidative fibers, the heart, and the liver. The lactate shuttle describes this redistribution rather than simple accumulation as waste.

Question 36Energy Systems and Metabolism

The respiratory exchange ratio (RER) of 1.00 during exercise most strongly indicates which fuel use?

  1. Predominantly carbohydrate oxidation Correct answer.
  2. Predominantly fat oxidation
  3. Predominantly ketone oxidation
  4. Equal protein and fat oxidation

Explanation

An RER near 1.00 reflects carbohydrate as the dominant fuel because carbohydrate oxidation produces carbon dioxide in equal proportion to oxygen consumed. Fat oxidation drives RER toward 0.70.

Question 37Energy Systems and Metabolism

Which hormone most directly stimulates glycogen breakdown in skeletal muscle during exercise?

  1. Insulin
  2. Epinephrine Correct answer.
  3. Thyroxine
  4. Aldosterone

Explanation

Epinephrine binds beta-adrenergic receptors and activates adenylate cyclase, raising cAMP and triggering glycogen phosphorylase. This mobilizes muscle glycogen for fast glycolysis during exercise.

Question 38Energy Systems and Metabolism

What does the term EPOC describe after exercise ends?

  1. The maximum oxygen uptake achieved during exercise
  2. The oxygen stored in myoglobin
  3. The elevated oxygen consumption above resting levels during recovery Correct answer.
  4. The oxygen deficit incurred at exercise onset

Explanation

EPOC, excess post-exercise oxygen consumption, is the oxygen uptake above baseline after exercise stops. It supports replenishment of phosphagen stores, lactate clearance, and restoration of temperature and hormones.

Question 39Energy Systems and Metabolism

A 400-meter sprint lasting about 55 seconds is primarily fueled by which energy system?

  1. The phosphagen system alone
  2. Fast glycolysis with a growing oxidative contribution Correct answer.
  3. Slow glycolysis with no lactate formation
  4. Oxidative phosphorylation alone

Explanation

Efforts lasting roughly 30 to 90 seconds rely heavily on fast glycolysis, though oxidative contribution rises as the effort continues. Phosphagen stores are largely depleted by this point.

Question 40Energy Systems and Metabolism

A marathoner hits the wall around 32 kilometers. Which explanation best fits the physiology?

  1. Complete depletion of intramuscular creatine phosphate
  2. Muscle glycogen depletion combined with limited blood glucose Correct answer.
  3. Excess oxygen availability in the mitochondria
  4. Failure of the electron transport chain to accept electrons

Explanation

Hitting the wall reflects glycogen depletion in working muscle, after which the athlete depends on blood glucose and fat. Fat oxidation cannot match the ATP demand at race pace, so pace collapses.

Question 41Energy Systems and Metabolism

Which adaptation best explains a trained athlete's ability to spare muscle glycogen at a given submaximal pace?

  1. Lower cardiac output at the same workload
  2. Reduced activity of beta-oxidation enzymes
  3. Increased reliance on fat oxidation and greater mitochondrial density Correct answer.
  4. Decreased capillary density around working muscle

Explanation

Endurance training raises mitochondrial density and beta-oxidation capacity, so fat supplies more ATP at a given pace. This glycogen sparing delays depletion and improves endurance performance.

Question 42Energy Systems and Metabolism

During high-intensity interval training, the accumulation of ADP, AMP, and inorganic phosphate is thought to contribute to which outcome?

  1. Reduced capillary blood flow
  2. Immediate depletion of all fat stores
  3. Enhanced mitochondrial biogenesis signaling Correct answer.
  4. Decreased enzyme activity in the Krebs cycle

Explanation

Rising AMP activates AMPK, and the altered energy charge signals PGC-1alpha, promoting mitochondrial biogenesis. This is a key reason interval training improves oxidative capacity.

Question 43Energy Systems and Metabolism

Which statement correctly describes the role of carnitine in fat metabolism?

  1. It transfers phosphate from creatine phosphate to ADP
  2. It converts pyruvate into acetyl-CoA
  3. It transports long-chain fatty acids into the mitochondrial matrix Correct answer.
  4. It accepts electrons at cytochrome oxidase

Explanation

Carnitine shuttles long-chain fatty acyl groups across the inner mitochondrial membrane via CPT-1 and CPT-2. Without this transport, long-chain fatty acids cannot undergo beta-oxidation.

Question 44Energy Systems and Metabolism

An athlete performs 30 seconds of all-out cycling. Which metabolic marker is expected to rise most sharply immediately afterward?

  1. Resting metabolic rate
  2. Myoglobin saturation
  3. Blood lactate concentration Correct answer.
  4. Muscle triglyceride content

Explanation

A 30-second all-out effort depends on fast glycolysis, producing large amounts of lactate that accumulate in muscle and blood. Blood lactate peaks shortly after the effort ends.

Question 45Energy Systems and Metabolism

Why does oxygen consumption remain elevated for minutes to hours after intense exercise?

  1. Because phosphagen resynthesis, lactate clearance, and hormone restoration require oxygen Correct answer.
  2. Because fat oxidation stops completely after exercise
  3. Because the body continues to produce ATP at maximal rates
  4. Because heart rate drops below resting values

Explanation

EPOC reflects the oxygen cost of restoring homeostasis, including phosphagen repletion, lactate removal, elevated temperature, and hormonal recovery. These processes consume oxygen above baseline.

Question 46Energy Systems and Metabolism

Which factor most limits the rate of ATP resynthesis by the phosphagen system during repeated maximal sprints?

  1. Availability of creatine phosphate stores Correct answer.
  2. Activity of the Krebs cycle
  3. Concentration of blood glucose
  4. Availability of oxygen in the mitochondria

Explanation

The phosphagen system depends on the local creatine phosphate pool, which is depleted quickly and repleted slowly. Repeated sprints therefore show declining power until creatine phosphate recovers.

Question 47Energy Systems and Metabolism

What is the main metabolic consequence of a low-carbohydrate diet for a high-intensity athlete?

  1. Increased glycogen stores and improved sprint capacity
  2. Increased reliance on the phosphagen system
  3. Reduced glycogen availability and earlier fatigue at high intensities Correct answer.
  4. Enhanced lactate clearance at maximal intensity

Explanation

Low carbohydrate intake limits muscle glycogen, and high-intensity exercise depends heavily on glycogen for fast glycolysis. The athlete fatigues earlier when glycogen is low.

Question 48Energy Systems and Metabolism

During prolonged exercise in heat, which fuel shift is most likely as glycogen falls?

  1. Increased reliance on intramuscular ATP stores
  2. Complete switch to anaerobic metabolism
  3. Increased reliance on creatine phosphate
  4. Increased reliance on fat oxidation and blood glucose Correct answer.

Explanation

As muscle glycogen declines, the body increases fat oxidation and depends more on blood glucose to sustain ATP production. This shift slows pace because fat oxidation is less efficient per unit of oxygen.

Question 49Energy Systems and Metabolism

Which statement best explains why lactate threshold is a useful predictor of endurance performance?

  1. It indicates complete depletion of creatine phosphate
  2. It equals the maximal heart rate of the athlete
  3. It reflects the maximum rate of fat oxidation
  4. It marks the intensity at which lactate appearance exceeds clearance and acidosis develops Correct answer.

Explanation

Lactate threshold is the intensity where lactate production outpaces clearance, signaling a shift toward greater glycolytic dependence and impending fatigue. Athletes with higher thresholds can sustain faster paces.

Question 50Energy Systems and Metabolism

How does the oxygen deficit at the start of exercise relate to EPOC at the end?

  1. Both occur only during steady-state exercise
  2. The deficit reflects early anaerobic ATP supply, while EPOC reflects post-exercise recovery costs Correct answer.
  3. Both measure maximal oxygen uptake
  4. They are identical in magnitude and duration

Explanation

The oxygen deficit describes the gap between oxygen demand and delivery early in exercise, covered by anaerobic sources. EPOC is the post-exercise oxygen cost of restoring homeostasis, and the two are related but distinct.