This Week in Training Science

RPE is exercise-dependent, so you should build separate RPE reference points for each lift rather than applying one universal effort scale across all exercises.

That's the week's most actionable takeaway, alongside research on oral contraceptives and hypertrophy, and practical content on exercise substitution, strength-to-weight ratio, and long-term programming.

Research Highlights

RPE Is Exercise-Dependent — Not Just Effort-Dependent Identical relative intensities can produce meaningfully different RPE scores depending on the exercise being performed. This isn't a minor calibration issue — it challenges the assumption that RPE is a clean, universal proxy for training intensity. Practically, this means RPE-based programming may need exercise-specific reference points rather than a single effort scale applied across all lifts.

Note: This reflects a general finding from the RPE literature rather than a single study we can attribute here. For a verifiable overview of RPE reliability and its variation across resistance exercises, see Zourdos et al. (2016), "Novel Resistance Training–Specific Rating of Perceived Exertion Scale Measuring Repetitions in Reserve," Journal of Strength and Conditioning Research, 30(1):267–275, and Hackett DA, Johnson NA, Halaki M, Chow CM (2012), "A novel scale to assess resistance-exercise effort," Journal of Sports Sciences, 30(13):1405–1413, which examined the accuracy of estimating repetitions in reserve. Treat the exercise-dependence point as a well-supported theme in this body of work rather than the result of one specific trial.

Oral Contraceptives and Hypertrophy: Nuance Over Headlines A systematic review found no consistent evidence that oral contraceptive use impairs muscle hypertrophy from resistance training. However, progestin type may matter: androgenic progestins may have a modest anabolic effect, while anti-androgenic variants could have the opposite influence. The overall signal is reassuring, but the details are worth understanding for individuals tracking hypertrophy outcomes closely.

Note: This nuance is discussed in Thompson B, Almarjawi A, Sculley D, Janse de Jonge X (2020), "The Effect of the Menstrual Cycle and Oral Contraceptives on Acute Responses and Chronic Adaptations to Resistance Training: A Systematic Review," Sports Medicine, 50(1):171–185.

Industry Updates

EGYM and the Longevity Shift in Fitness Tech EGYM has been publicly positioning its platform around "biological age" and healthspan-oriented training, which fits a broader direction change in fitness technology. We were unable to independently verify the specific details of a named "BioAge update" or a distinct "Longevity Training program," so treat those as unconfirmed product specifics rather than established features. The broader trend, however, is real enough to note: some fitness technology is beginning to treat aging as a training variable, not just a demographic footnote. If EGYM has published details on these features, we'll update this item with a direct source.

Training Takeaways

  • Calibrate RPE by exercise, not just effort. The same perceived exertion means different things on a squat versus an isolation movement. Build your RPE landmarks exercise by exercise over time.
  • Oral contraceptive type can influence hypertrophy context. The overall evidence is reassuring, but if you're tracking muscle development carefully, understanding your progestin profile is a reasonable step.
  • Substituting a lift and modifying a lift are different decisions. The exercise substitution pillar this week draws a clear line: discomfort doesn't always warrant cutting an exercise, and not every substitution is a downgrade. Use a framework before making the call.
  • Strength-to-weight ratio is a more honest progress metric than total load. Tracking relative strength over time — especially across weight fluctuations — gives a cleaner picture of athletic development than absolute numbers alone.
  • Pick a program that matches your goals and log it consistently. If you're running a structured template like 5/3/1, Kenso includes it among its 14 built-in programs, or you can use the custom builder to set up your own. From there, fast set/rep/weight logging — plus RPE, energy, and rest-timer tracking — keeps a clear record of every session as you progress.