Research
Energy balance
Performing aerobic exercise in the morning (fasted or pre-breakfast) increases 24-hour fat oxidation compared to exercising in the afternoon or evening.
If your goal is to maximize fat oxidation over the entire day, try doing your cardio before breakfast. However, be aware that this effect might depend on your fasting state; if you eat a meal 3 hours before exercise, this timing benefit may disappear.
ModerateSupportsMEDIUM confidence
朝食前の運動条件では午前中，午後，夕食後の運動条件と比較して 1 日の脂質酸化量が高いことを明らかにしている
Why this rating
Based on cited studies (Ref 37, 38) in female subjects; the paper notes conflicting results regarding lipid metabolism hormones depending on fasting state.
Source
Circadian rhythms and exercise/physical activity
Masaki Takahashi et al. · Japanese Journal of Physical Fitness and Sports Medicine · 2020
DOI 10.7600/jspfsm.69.351
narrative_reviewCited 1×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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