HMS, TIP 2017 HSC 26

Explain the physiological adaptations an individual develops in response to the different principles of training. Use examples to support your answer. (8 marks)

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Progressive overload directly triggers cardiovascular adaptations in trained athletes. This occurs because gradually increasing training intensity forces the heart to work harder over time. As a result, stroke volume increases as the heart becomes stronger and pumps more blood per beat. For instance, when a cyclist progressively increases weekly mileage, their resting heart rate decreases significantly. This demonstrates why endurance athletes develop enlarged left ventricles and improved cardiac efficiency.
The principle of specificity generates targeted muscular adaptations based on training type performed. This happens because muscles adapt specifically to the demands placed upon them during exercise. Consequently, resistance training causes muscle hypertrophy whilst endurance training increases mitochondrial density. A clear example is powerlifters developing increased fast-twitch muscle fibres for explosive movements. In contrast, marathon runners develop enhanced slow-twitch fibres for sustained aerobic performance.
Training thresholds produce specific metabolic adaptations when athletes train at appropriate intensities. This works by challenging energy systems at their optimal training zones for maximum adaptation. Therefore, training above the anaerobic threshold improves lactate buffering capacity and tolerance. Evidence of this includes sprint athletes who can maintain higher lactate concentrations without performance decline. This explains why proper intensity prescription maximises physiological improvements.

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Progressive overload directly triggers cardiovascular adaptations in trained athletes. This occurs because gradually increasing training intensity forces the heart to work harder over time. As a result, stroke volume increases as the heart becomes stronger and pumps more blood per beat. For instance, when a cyclist progressively increases weekly mileage, their resting heart rate decreases significantly. This demonstrates why endurance athletes develop enlarged left ventricles and improved cardiac efficiency.
The principle of specificity generates targeted muscular adaptations based on training type performed. This happens because muscles adapt specifically to the demands placed upon them during exercise. Consequently, resistance training causes muscle hypertrophy whilst endurance training increases mitochondrial density. A clear example is powerlifters developing increased fast-twitch muscle fibres for explosive movements. In contrast, marathon runners develop enhanced slow-twitch fibres for sustained aerobic performance.
Training thresholds produce specific metabolic adaptations when athletes train at appropriate intensities. This works by challenging energy systems at their optimal training zones for maximum adaptation. Therefore, training above the anaerobic threshold improves lactate buffering capacity and tolerance. Evidence of this includes sprint athletes who can maintain higher lactate concentrations without performance decline. This explains why proper intensity prescription maximises physiological improvements.

♦♦♦ Mean mark 43%.