WOD: (from 9/7/15)
20 KB Swings (1.5/1)
20 Single Arm KB Front Rack Step-ups (1.5/1)*
20 Abmat Sit-ups
20 Box Jumps (24/20)
*10 step-ups with KB on right side front rack, 10 on left side front rack
Apropos the unseasonably warm weather lately, a post from Mark’s Daily Apple:
A few months ago, I explored the benefits and applications of cold therapy. Today, I’m going to talk about the benefits and applications of heat therapy—one of the most ubiquitous and ancestral therapies in the history of humankind. You name a culture and—as long as they didn’t live in perpetual tropical heat—they probably had some form of heat therapy. Native Americans had the sweat lodge, those of Central America the temazcal. The Romans had the thermae, which they picked up and refined from the Greeks. Other famous traditions include Finnish saunas, Russian banyas, Turkish hammams, Japanese sentó (or the natural spring-fed onsen), and the Korean jjimjilbang. People really like the heat.
Right off the bat, that’s one major benefit to heat therapy compared to cold: It’s an easy sell. “You can luxuriate in a sauna for half an hour or lower your naked body, genitals first, into a bathtub filled with ice water. Your choice.” People are far more likely to sit in the hot room for 20 minutes than they are to sit in an ice bath for 3 minutes or even take a cold shower. Short-term heat exposure is generally regarded as pleasant. Cold exposure is generally regarded as torture. If heat therapy offers legit health benefits, this is a major point in its favor. So, does it?
In a recent review of the available observational studies, controlled trials, and interventions, researchers found evidence that sauna usage has an impressive array of beneficial effects on health and wellness:
What’s going on here? How could sitting in a hot room do so many good things?
Stress, in a word. One of the coolest things about us is that encountering, facing down, and then growing resistance to one type of stress tends to make us better at dealing with stress from other sources. A 30-minute sauna session at 174 ºF/80 ºC raises body temperature by almost 1 degree C, spikes your flight-or-flight hormones, raises cortisol, and triggers a powerful hormetic response by the rest of your body. That’s a stressor. After such a session, subjects report feeling “calm” and “pleasant.” This isn’t a surprise. Intense exercise also raises cortisol in the short term. And like regular exercise, longer term sauna usage (daily for four weeks in one study) actually reduces stress hormones. It’s a classic hormetic response, where acute doses of the stressor increase oxidative stress enough to provoke a compensatory adaptation by the organism.
What does this sauna-induced hormetic stress do for us?
It reduces oxidative stress. Short term, it increases stress (that’s why we see the transient spike in cortisol and other stress hormones). Long term, it reduces oxidative stress. Long-term sauna use has an inverse association with levels of C-reactive protein (CRP), a “catch-all” biomarker for oxidative stress and inflammation. The more often you use the sauna, the lower your CRP.
It may reduce mortality. The more frequently a person visits the sauna, the lower his risk of premature death from heart attack and all causes. There is a dose-response relationship happening here, which has me leaning toward “causal.” Those using the sauna two to three times a week had a 23% lower risk of fatal heart attack compared to men who used it just once a week. Men who used the sauna four to seven times a week had a 48% reduced risk of fatal heart attack compared to once-a-weekers. The more frequently men used the sauna, the greater the protection (for other causes of mortality, too).