Rate-of-Change Targets

A rate-of-change target turns a vague goal ("lose weight," "bulk up") into a measurable weekly slope you can steer against. You compute the actual rate from the smoothed trend (this week's average minus last week's) and compare it to the target.

Common evidence-based targets:

• Fat loss: roughly 0.5–1% of bodyweight per week (for an 80 kg person, ~0.4–0.8 kg/wk). Faster risks excess muscle loss; much slower may not feel motivating.
• Muscle gain (lean bulk): much slower — often ~0.25–0.5% of bodyweight per week for trainees past the novice stage, since muscle accrues slowly and faster gain is mostly fat.
• Endurance/strength volume: progression rates (e.g. the "~10% per week" running-volume rule of thumb) are themselves rate-of-change targets, though that specific number is a guideline, not a law.

How to use it:

• Compare the smoothed actual rate to the target over a 2–3-week window (so noise has cleared — see trend-vs-noise).
• Too slow / stalled → tighten the lever (cut intake, add activity/volume).
• Too fast → ease off (risk of muscle loss, under-recovery, injury).
• This comparison is the trigger logic for program adjustments and the measurable core of a SMART goal.

Rates scale to the person (percent of bodyweight), so they generalize across sizes better than absolute kg/week figures.

• Target a weekly rate, then steer the smoothed trend toward it.
• Fat loss ≈ 0.5–1% bodyweight/week; faster risks muscle loss.
• Lean muscle gain ≈ 0.25–0.5% bodyweight/week past novice stage.
• Evaluate over a 2–3-week window so noise clears.
• Too slow → tighten the lever; too fast → ease off.

• moving-averages — the smoothed trend you measure the rate from.
• trend-vs-noise — why a multi-week window is required.
• safe-deficit-rate — nutrition-side detail on safe rates.
• when-to-adjust — rate vs target is the adjustment trigger.
• smart-goals — rate targets make goals measurable.