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RPE Drift Tracker

Track how your RPE accuracy changes over a training session

Session Sets

Enter your working sets in the order you performed them within a single session

Fatigue Signature

E1RM drop (first to last set)

First E1RM

Last E1RM

Total Drop

%

Per-Set Drift

%

E1RM Drift Chart

Trendline shows the rate of fatigue accumulation across your session

Set-by-Set Breakdown

Cumulative fatigue percentage relative to your first set

Set Weight Reps RPE E1RM Cumulative Fatigue

Recommendations

Related Calculators

RPE Standards Grade your RPE accuracy Backoff Sets Calculate fatigue-adjusted weights E1RM Calculator Estimate your one-rep max

Understanding Intra-Session Fatigue

As you perform more sets in a session, accumulated fatigue reduces your capacity. This shows up as a declining E1RM from set to set. A small decline (under 2%) is normal and expected. A large decline (over 5%) indicates significant fatigue accumulation.

High drift rates may mean you need: longer rest periods between sets, fewer total working sets, or larger backoff drops. Conversely, very low drift may indicate your sets aren't challenging enough or rest periods are excessive.

Track your drift rate over several sessions to establish your personal fatigue profile and optimize your training volume accordingly.

Frequently Asked Questions

Most lifters experience a 2-5% E1RM decline across 4-6 working sets with 3-5 minute rest periods. Elite lifters with better work capacity may see less decline. If your drift exceeds 7-8%, you are likely accumulating more fatigue than you can productively recover from within the session.
Only enter your working sets (typically RPE 7+). Warm-up sets at low RPE will produce unreliable E1RM estimates and skew the fatigue analysis. Your first working set should represent your pre-fatigue baseline.
Longer rest periods (4-5+ minutes) allow more phosphocreatine recovery and reduce drift. Shorter rest (1-2 minutes) significantly increases fatigue accumulation. For strength work (1-5 reps), 3-5 minutes is typically optimal. For hypertrophy (8-12 reps), 2-3 minutes is standard.
Compound lifts (squat, deadlift) typically show more drift than isolation movements due to systemic fatigue. Comparing drift rates across exercises helps you understand which movements fatigue you fastest and may need more conservative volume prescriptions.

Fatigue analysis is based on E1RM estimates from the Tuchscherer RPE chart. Actual fatigue may vary based on rest periods, nutrition, and training history. Use all sets from a single session for best results.