While some
people are up at the crack of dawn to lace up their running shoes, others can’t
fathom a workout before noon. Finding the perfect time to exercise is as much
about personal preference as it is physiology. Exercise is supposed to feel
good—but if muscles are tight in the morning or working
out too late disrupts sleep, it can feel counterproductive.
out too late disrupts sleep, it can feel counterproductive.
Afternoon
Advantages
Plenty of
people tout the benefits of early morning sweat sessions, but if you can't fit
in a workout before noon, don't sweat it. Research suggests the body could adapt
to regular gym dates, so if we hit the weight room every day at 4 p.m.,
eventually we might perform better at that time than at any other time of day.
These findings are similar to earlier research, which suggests that sticking to
a specific workout time can result in better performance, higher oxygen
consumption, and lower perceived exhaustion. But scheduling a workout is more
complicated than choosing a number on the clock.
Your body’s
core temperature is an important factor in determining the quality of exercise.
A cold body leaves muscles stiff, inefficient, and susceptible to sprains,
whereas higher body temperatures leave muscles more flexible. Body temperature
typically increases throughout the day, so muscle strength and endurance may
peak in the late afternoon, when body temperature is highest. The afternoon is
also when reaction time is quickest and heart rate and blood pressure are
lowest, all of which combine to improve performance and reduce the overall
likelihood of injury.
Hormone
levels are also important in determining optimal workout time. Testosterone is
important for muscle growth and strength, in ladies and gents. And the body
produces more testosterone during late afternoon resistance training than it
does during morning workouts. Plus, the stress hormone cortisol, which aids in
the storage of fat and reduction of muscle tissue, peaks in the morning and
decreases throughout the day and during exercise. But early birds, take heart:
Morning workouts can be successful too.
Morning Perks
It's sometimes easier to keep a morning workout
routine consistent. Afternoon and evening workouts are more likely to conflict
with other responsibilities as the day progresses. Plus a full day’s work can
take a serious toll on willpower—which can overcome any gym-goer’s best intentions.
Morning workouts might also be a good option for
stress-free snoozing. Since exercise increases heart rate and body temperature,
working out too late in the evening (generally after 8 p.m.) may disrupt sleep,
while one study showed that working out at 7 a.m. (compared to 1 p.m. or 7
p.m.) may help people sleep more soundly at night.
Finally, one study found that 45 minutes of moderate
morning exercise (like walking briskly on the treadmill) helped curb appetite
directly after working out. Research also shows that people can burn up to 20
percent more body fat exercising on an empty stomach—much easier to do first
thing in the a.m. than at night.
The
Bottom Line
In the end, it's most important to find a realistic,
consistent workout schedule, no matter what the time. If working out in the
morning is best for your schedule, just make sure to warm up muscles that might
be cold and tight from sleep. And to keep afternoon workouts consistent, treat
them as unbreakable appointments, find a workout buddy, and keep a gym bag in
the car or office to minimize excuses.
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