Here is an article which provides a lot of validation for both CrossFit, and what I have been telling y'all for a long time.
New York Times
November 2, 2008
Phys Ed
Stretching: The Truth
By GRETCHEN REYNOLDS
WHEN DUANE KNUDSON, a professor of kinesiology at California State University,
Chico, looks around campus at athletes warming up before practice, he
sees one dangerous mistake after another. "They're stretching, touching
their toes. . . . " He sighs. "It's discouraging."
If you're like most of us, you were taught the importance of warm-up
exercises back in grade school, and you've likely continued with pretty
much the same routine ever since. Science, however, has moved on.
Researchers now believe that some of the more entrenched elements of
many athletes' warm-up regimens are not only a waste of time but
actually bad for you. The old presumption that holding a stretch for 20
to 30 seconds -- known as static stretching -- primes muscles for a
workout is dead wrong. It actually weakens them. In a recent study
conducted at the University of Nevada,
Las Vegas, athletes generated less force from their leg muscles after
static stretching than they did after not stretching at all. Other
studies have found that this stretching decreases muscle strength by as
much as 30 percent. Also, stretching one leg's muscles can reduce
strength in the other leg as well, probably because the central nervous
system rebels against the movements.
"There is a neuromuscular inhibitory response to static stretching,"
says Malachy McHugh, the director of research at the Nicholas Institute
of Sports Medicine and Athletic Trauma at Lenox Hill Hospital in New
York City. The straining muscle becomes less responsive and stays
weakened for up to 30 minutes after stretching, which is not how an
athlete wants to begin a workout.
THE RIGHT WARM-UP should do two things: loosen muscles and tendons
to increase the range of motion of various joints, and literally warm
up the body. When you're at rest, there's less blood flow to muscles
and tendons, and they stiffen. "You need to make tissues and tendons
compliant before beginning exercise," Knudson says.
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.) Then it's time for the most important and
unorthodox part of a proper warm-up regimen, the Spider-Man and its
counterparts.
"TOWARDS THE end of my playing career, in about 2000, I started
seeing some of the other guys out on the court doing these strange
things before a match and thinking, What in the world is that?" says
Mark Merklein, 36, once a highly ranked tennis player and now a
national coach for the United States Tennis Association.
The players were lunging, kicking and occasionally skittering,
spider-like, along the sidelines. They were early adopters of a new
approach to stretching.
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.
(For other dynamic stretches, see the sidebar below.)
Even golfers, notoriously nonchalant about warming up (a recent
survey of 304 recreational golfers found that two-thirds seldom or
never bother), would benefit from exerting themselves a bit before
teeing off. In one 2004 study, golfers who did dynamic warm- up
exercises and practice swings increased their clubhead speed and were
projected to have dropped their handicaps by seven strokes over seven
weeks.
Controversy remains about the extent to which dynamic warm-ups
prevent injury. But studies have been increasingly clear that static
stretching alone before exercise does little or nothing to help. The
largest study has been done on military recruits; results showed that
an almost equal number of subjects developed lower-limb injuries (shin splints,
stress fractures, etc.), regardless of whether they had performed
static stretches before training sessions. A major study published
earlier this year by the Centers for Disease Control,
on the other hand, found that knee injuries were cut nearly in half
among female collegiate soccer players who followed a warm-up program
that included both dynamic warm-up exercises and static stretching.
(For a sample routine, visit www.aclprevent.com/pepprogram.htm.)
And in golf, new research by Andrea Fradkin, an assistant professor of
exercise science at Bloomsburg University of Pennsylvania, suggests
that those who warm up are nine times less likely to be injured.
"It was eye-opening," says Fradkin, formerly a feckless golfer herself. "I used to not really warm up. I do now."
You're Getting Warmer: The Best Dynamic Stretches
These exercises- as taught by the United States Tennis Association's
player-development program - are good for many athletes, even golfers.
Do them immediately after your aerobic warm-up and as soon as possible
before your workout.
STRAIGHT-LEG MARCH
(for the hamstrings and gluteus muscles)
Kick one leg straight out in front of you, with your toes flexed
toward the sky. Reach your opposite arm to the upturned toes. Drop the
leg and repeat with the opposite limbs. Continue the sequence for at
least six or seven repetitions.
SCORPION
(for the lower back, hip flexors and gluteus muscles)
Lie on your stomach, with your arms outstretched and your feet
flexed so that only your toes are touching the ground. Kick your right
foot toward your left arm, then kick your leftfoot toward your right
arm. Since this is an advanced exercise, begin slowly, and repeat up to
12 times.
HANDWALKS
(for the shoulders, core muscles, and hamstrings)
Stand straight, with your legs together. Bend over until both hands
are flat on the ground. "Walk" with your hands forward until your back
is almost extended. Keeping your legs straight, inch your feet toward
your hands, then walk your hands forward again. Repeat five or six
times. G.R.
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