30 Seconds Summary
Can We Predict Muscle Growth?

  • Higher training volume generally correlates with more muscle hypertrophy, but the exact measurement and impact of training volume is complex.
  • Volume load, calculated as sets x reps x weight, can be misleading as it varies greatly with slight changes in exercise or rep ranges, and doesn't consistently predict muscle growth.
  • Volume load assumes heavier loaded exercises are superior for hypertrophy, which isn't necessarily true, as muscle growth doesn't linearly correlate with the amount of weight lifted.
  • The concept of 'effective reps' suggests that reps closer to muscle failure are more beneficial for growth, although this is difficult to measure and its effectiveness is debated.
  • Time under tension, a popular metric involving the duration muscles are under strain during a workout, has not shown a strong correlation with muscle hypertrophy in studies.
  • Counting 'hard sets'—sets performed close to failure—may provide a more functional measure of training volume for muscle growth, yet it also omits less intense sets that can contribute to growth.
  • Existing methods like volume load, relative volume, effective reps, and time under tension don't effectively or reliably predict hypertrophy due to the individual complexities of physiology.
  • Despite the intricacies in measuring and predicting hypertrophy, the fundamental principle remains that hard work and incremental increases in workout intensity are key to muscle growth.

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