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Exercise, RHR & energy: what the research actually says

Exercise improves sleep, sleep improves exercise, and the loop can be started from either end — the basis of the 5·4·3·2·1 rule.

All studies · 8

Effects of evening exercise on sleep in healthy participants: a systematic review and meta-analysisStutz J, Eiholzer R, Spengler CM · Sports Medicine 49(2):269–287 · 2019Evening exercise does not harm sleep — unless vigorous exercise ends within ~1 h of bedtime.Effects of exercise on the resting heart rate: a systematic review and meta-analysis of interventional studiesReimers AK, Knapp G, Reimers CD · Journal of Clinical Medicine 7(12):503 · 2018Endurance training lowers resting heart rate by ~5 bpm on average; yoga also lowers it.The effects of physical activity on sleep: a meta-analytic reviewKredlow MA, Capozzoli MC, Hearon BA, Calkins AW, Otto MW · Journal of Behavioral Medicine 38(3):427–449 · 2015Regular exercise modestly improves total sleep, efficiency and deep sleep.The bidirectional relationship between exercise and sleep: implications for exercise adherence and sleep improvementKline CE · American Journal of Lifestyle Medicine 8(6):375–379 · 2014Better sleep → more exercise → better sleep: a loop worth starting anywhere.Association between objectively-measured physical activity and sleep, NHANES 2005–2006Loprinzi PD, Cardinal BJ · Mental Health and Physical Activity 4(2):65–69 · 2011150 min/week of moderate-vigorous activity was associated with ~65% better odds of feeling well rested.Benefits of napping in healthy adults: impact of nap length, time of day, age, and experience with nappingMilner CE, Cote KA · Journal of Sleep Research 18(2):272–281 · 2009Short (10–20 min) early-afternoon naps improve alertness with little sleep inertia; long/late naps cut into night sleep.Effects of chronic exercise on feelings of energy and fatigue: a quantitative synthesisPuetz TW, O'Connor PJ, Dishman RK · Psychological Bulletin 132(6):866–876 · 2006Across 70 trials, regular exercise reliably increased feelings of energy and reduced fatigue — Galpin's 'stress inoculation'.The post-lunch dip in performanceMonk TH · Clinics in Sports Medicine 24(2):e15–e23 · 2005The early-afternoon dip is a normal circadian feature, largely independent of lunch — 'that's the point'.

Related guides

Beware of health anxietyResting heart rate: the canary in the coal mineEnergy: the #1 complaintThe 5-4-3-2-1 fat-loss ruleExercise timing and sleepNaps and the afternoon dip

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Frequently asked questions

What does the research say about exercise, RHR & energy?

Endurance training lowers resting heart rate by ~5 bpm on average; yoga also lowers it.

How do I track exercise, RHR & energy?

SleepShred logs it in about 20 seconds a day and then compares your nights with and without it, so you see the effect on your own sleep instead of the study average.

Is SleepShred free?

No. SleepShred Pro is $4.99 per month or $29.99 per year, with no free trial and no ads. Everything stays on your iPhone.

Track it, don't guess it

SleepShred turns this research into a 20-second daily habit: log your night, see which of your own behaviours move your sleep, and screen for the disorders nobody diagnoses.

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Educational summary of published research, not medical advice. Screening scores are not diagnoses. If a score is elevated or you feel unwell, talk to a clinician.