The latest thing you thought was good for you, debunked. Stretching. Article from NY Times (Gretchen Reynolds, 10/31/2008) cites various medical sources who say the usual warm-up routines can leave you worse off than if you did stood around and did nothing. Take a short jog, hip-hop around, crawl on all fours and do a spider jig—anything to warm up your cold quads, glutes, etc., will help you in whatever race, game, etc., you’re about to enter.
The popular “static stretch”, where you reach down or across and hold a pose, does the opposite, making you 30% weaker, on average, if you believe the experts cited here. My favorite, putting a straight leg on the bumper of the car and leaning forward until my hamstrings complain, is a no-no, and may explain why I’m not winning more time-trials on the bike. A good excuse, anyway.
Here’s an excerpt from the Reynolds’ piece:
A well-designed warm-up starts by increasing body heat and blood flow. Warm muscles and dilated blood vessels pull oxygen from the bloodstream more efficiently and use stored muscle fuel more effectively. They also withstand loads better. One significant if gruesome study found that the leg-muscle tissue of laboratory rabbits could be stretched farther before ripping if it had been electronically stimulated — that is, warmed up.
To raise the body’s temperature, a warm-up must begin with aerobic activity, usually light jogging. Most coaches and athletes have known this for years. That’s why tennis players run around the court four or five times before a match and marathoners stride in front of the starting line. But many athletes do this portion of their warm-up too intensely or too early. A 2002 study of collegiate volleyball players found that those who’d warmed up and then sat on the bench for 30 minutes had lower backs that were stiffer than they had been before the warm-up. And a number of recent studies have demonstrated that an overly vigorous aerobic warm-up simply makes you tired. Most experts advise starting your warm-up jog at about 40 percent of your maximum heart rate (a very easy pace) and progressing to about 60 percent. The aerobic warm-up should take only 5 to 10 minutes, with a 5-minute recovery. (Sprinters require longer warm-ups, because the loads exerted on their muscles are so extreme.)…
While static stretching is still almost universally practiced among amateur athletes — watch your child’s soccer team next weekend — it doesn’t improve the muscles’ ability to perform with more power, physiologists now agree. “You may feel as if you’re able to stretch farther after holding a stretch for 30 seconds,” McHugh says, “so you think you’ve increased that muscle’s readiness.” But typically you’ve increased only your mental tolerance for the discomfort of the stretch. The muscle is actually weaker.
Stretching muscles while moving, on the other hand, a technique known as dynamic stretching or dynamic warm-ups, increases power, flexibility and range of motion. Muscles in motion don’t experience that insidious inhibitory response. They instead get what McHugh calls “an excitatory message” to perform.
Dynamic stretching is at its most effective when it’s relatively sports specific. “You need range-of-motion exercises that activate all of the joints and connective tissue that will be needed for the task ahead,” says Terrence Mahon, a coach with Team Running USA, home to the Olympic marathoners Ryan Hall and Deena Kastor. For runners, an ideal warm-up might include squats, lunges and “form drills” like kicking your buttocks with your heels. Athletes who need to move rapidly in different directions, like soccer, tennis or basketball players, should do dynamic stretches that involve many parts of the body. “Spider-Man” is a particularly good drill: drop onto all fours and crawl the width of the court, as if you were climbing a wall.
Wenig
Hiroshi Hoketsu. (David Heckar/AFP/Getty Images)