Posted on February 17 2017
"If I wear my Physiclo resistance tights during a distance run on Monday, can I just air it out and wear it again for my gym session on Tuesday?"
It's a question we get asked pretty frequently.
Washing your favorite workout gear after every use isn't always practical, especially if you have to cough up $2.50 per wash. If you didn't work up much of a sweat (and it's only *cough* slightly dirty), it's not a big deal to just re-wear it for one more workout right?
As someone with a background in biomedical engineering and medical school, here's my take:
The short answer is no, it's not recommended to re-wear your workout clothes because bacteria and yeast tend to rub off onto your clothing, especially after you sweat.
When you put the dirty clothes on again the next day, the bacteria will have multiplied (as bacteria do), which leads to smellier odors and potentially skin irritation or infection.
The longer answer though, is that it's actually not bad ALL the time- it depends on quite a few factors, such as how much you sweat in the clothes, whether you stuffed it in a hamper or left it out, and even the type of fabric.
Different fabrics tend to collect different types of bacteria (e.g. polyester tends to house micrococcus, while cotton is more prone to collecting staphylococcus). This can be significant because micrococcus in polyesters can cause more rank odors but rarely cause infections.
Different fabrics house different bacteria
A study the University of Alberta found that surprisingly, the bacteria counts on synthetic versus natural fabrics were not significantly different. As long as there's moisture and air, bacteria will continue to multiply until they reach a saturation point.
There are some exceptions though, such as with Viscose, which is made from regenerated wood cellulose. Also, fabrics can be treated and infused with specific antimicrobials, such as copper, silver, or gold particles, to kill and prevent bacterial growth.
But more importantly, there's a big difference in the TYPES of bacteria that tend to grow in different fabrics.
Micrococcus grows the most on polyester because they're an aerobic bacteria that prefers the open-air lattice structure of synthetic fibers. The result is what causes your polyesters to stink more than cotton, especially when reworn, as micrococcus is known for its ability to create malodor from sweat secretions.
Meanwhile, a study at the University of Ghent in Belgium found that cotton tends to have the highest growth of Staphylococcus hominis, which is mostly harmless and usually found on the skin, but can occasionally cause infections under certain conditions. Nylons housed more propionibacterium, which are known to cause an intense, acidic foot odor.
So in short, it's probably worse to re-wear your high-quality synthetic workout clothes, mainly because of the stench. Cotton is better to re-wear, but be careful if you're sick or immunocompromised. If you must re-wear something the next day, leave your clothes somewhere to dry quickly, as opposed to throwing them in a damp hamper.
Not all workouts are created equal
Sweat is one of the biggest factors, as it provides the warm, damp environment that allows bacteria to thrive. For that reason, it might be OK to re-wear your workout clothes after less intense activities where you don't sweat as much, such as yoga or power walking, as opposed to a spin class or a CrossFit session.
Another thing to note is WHERE you wear your clothes to, because your clothes will pick up bacteria from your environment as well. Even if you don't sweat that much at the gym, your clothes will be picking up bacteria from other peoples' sweat left on gym mats and equipment.
Can you actually get an infection?
Infections aren't common, but they can occur. Anytime you wear tight, wet clothing for too long, especially when you put on yesterday's not-completely-dry yoga pants, it causes moisture to be trapped and retained, which can lead to fungal or yeast infections.
The risk of infections is also higher when your immune system is compromised, if you have any open wounds or sores, or if you're on certain meds like acne medication.
Speaking of which, another issue to look out for is acne. Re-wearing sweaty, dirty clothes can cause dirt and acne-causing bacteria to accumulate in your pores.
Do you ever re-wear your Physiclo resistance pants?
Tell us what you're experience has been like! We'd love to hear your feedback.
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I wear my work out shorts for 3 workouts and my shirts only once. I work out Mon- Wed & Fri. Some Sundays. I am retired. I pick out a great rock shirt and wear it on my inbetween days. I then wear it for my workout then into the hamper. So I get maximum use of my shirts Most Days I sit around the apt in my old clothes.. If I don’t go out that day , well I just pick a average workout shirt and it goes right into the hamper after the workout. I weight train and then do about 30 mins of cardio before I go home.. I own about 200 vintage rock shirts and I try to be gentle with them.I know that was more than you asked for but hey, I’m retired.
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The human race has evolved fairly efficiently thus far without the need to wash clothes after every single use. So long as things are dried out between uses and don’t actually smell bad, then it’s clearly fine to wear them again. I go to the gym 3 or 4 times a week and running outdoors 3 times a week, wearing a new outfit each time would be ridiculous, and in fact I’d be more concerned about your body’s exposure to all the weird chemicals that get put into detergents and fabric softeners than your own sweat. And I’m darned certain no-one ever got a “yeast infection” from wearing yesterday’s yoga trousers, especially if you wear clean underwear each day.
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As one who used to just throw my running gear on a damp pile, I’ve long since learned to put gear on a drying rack as soon as I take it off and to check for odor when putting it away after it is dry.
At the first sign of any odor—maybe after 4 or 5 uses—I rinse them while taking a shower. If there is still a problem, into the washer they go. That is certainly a last resort, though, given the fragility of compression wear vs., say, t-shirts or jeans.
True, I’m not what you’d call a heavy user of such gear. Most my heavy work is swimming, where everything is getting washed all the time. (And going on the drying rack as soon as it comes off, etc.)