Your Body's Built for Exercise
The 20s are prime time for fitness, says Janet Hamilton, a certified strength and conditioning specialist and exercise physiologist at in Atlanta. (Okay, maybe you’ve gained a few pounds since you ran high school track, but some of that weight is probably from muscle.) That’s because, during your 20s, estrogen, progesterone, testosterone, human growth hormone, and thyroid hormone are all working together to keep you in tip-top baby-making shape. As an added bonus, they improve your body’s muscle-building power, she says. Meanwhile, during your 20s, you are at your peak cardiorespiratory capability, says board-certified internist , M.D., a medical weight-loss and bioidenticial hormone-replacement therapy expert in New York City. Bring on the endurance races.
But Your Metabolism Is Already Slowing
Womp, womp. After 20, the average basal metabolic rate (BMR), the number of calories you’d burn if you stayed in bed all day, drops by one to two percent per decade, according to the American Council on Exercise. Most of that dip may be due to the unfortunate fact that when most women enter the “real world,” they sit at a desk more and walk around less, says ACE-certified personal trainer Kathy Kaehler, a health and wellness expert for . At any age, increasing your activity levels and muscle mass can help keep your BMR high. Muscle makes up a large part of your body’s “engine,” so the more muscle you have, the more fuel you’ll burn, whether you are hanging out with friends or powering through a workout, says Hamilton.
DHEA Declines
Levels of this guy, which is a precursor to both estrogen and testosterone, peak in your 20s and start tapering off once you hit the big 3-0. While it’s not clear if DHEA supplementation can have any effect on anti-aging, according to the National Institute on Aging, the loss of DHEA as you age may slow your exercise recovery time and increase your body’s muscle-to-fat ratio, says Decottis. To help combat fat gain, focus on strength training. In a , men who lifted weights each day for 20 minutes put on less belly fat as they aged compared to guys who spent the same amount of time doing cardio.
Babies Block Your Workout
With your doctor’s permission, you can keep up your workout routine with a bun in the oven. But pregnancy is not the time to start a high-intensity training program. Your body is going through enough changes as it is. During pregnancy, your hormones shift, and your body focuses the bulk of its energy on the pregnancy, not your muscles, says Kaehler. After the baby comes, breastfeeding can burn crazy calories, which helps some women lose the pregnancy weight. But still, it’s not the right time to push your workout to the max, says Hamilton. “Trying to train at a high level immediately after giving birth is risky because hormones are not balanced back to ‘normal’ as long as you’re breastfeeding," she says. "I’ve seen an increased incidence of stress fractures in women who push to train at a high level during the postpartum period. I recommend training be moderated until after breastfeeding has ceased and normal menstruation has returned, which to me signals that the woman’s hormonal balance is back.” Once your baby has permanently detached from your nipples, though, you can crank up your workout’s intensity.
No comments:
Post a Comment