They do it late at night when their parents are asleep. They do it in restaurants and while crossing busy streets. They do it in the classroom with their hands behind their back. They do it so much their thumbs hurt.

Spurred by the unlimited texting plans offered by carriers like AT&T Mobility and Verizon Wireless, American teenagers sent and received an average of 2,272 text messages per month in the fourth quarter of 2008, according to the Nielsen Company — almost 80 messages a day, more than double the average of a year earlier.

The phenomenon is beginning to worry physicians and psychologists, who say it is leading to anxiety, distraction in school, falling grades, repetitive stress injury and sleep deprivation.

Dr. Martin Joffe, a pediatrician in Greenbrae, Calif., recently surveyed students at two local high schools and said he found that many were routinely sending hundreds of texts every day.

“That’s one every few minutes,” he said. “Then you hear that these kids are responding to texts late at night. That’s going to cause sleep issues in an age group that’s already plagued with sleep issues.”

The rise in texting is too recent to have produced any conclusive data on health effects. But Sherry Turkle, a psychologist who is director of the Initiative on Technology and Self at the Massachusetts Institute of Technology and who has studied texting among teenagers in the Boston area for three years, said it might be causing a shift in the way adolescents develop.

“Among the jobs of adolescence are to separate from your parents, and to find the peace and quiet to become the person you decide you want to be,” she said. “Texting hits directly at both those jobs.”

Psychologists expect to see teenagers break free from their parents as they grow into autonomous adults, Professor Turkle went on, “but if technology makes something like staying in touch very, very easy, that’s harder to do; now you have adolescents who are texting their mothers 15 times a day, asking things like, ‘Should I get the red shoes or the blue shoes?’ ”

As for peace and quiet, she said, “if something next to you is vibrating every couple of minutes, it makes it very difficult to be in that state of mind.

“If you’re being deluged by constant communication, the pressure to answer immediately is quite high,” she added. “So if you’re in the middle of a thought, forget it.”

Michael Hausauer, a psychotherapist in Oakland, Calif., said teenagers had a “terrific interest in knowing what’s going on in the lives of their peers, coupled with a terrific anxiety about being out of the loop.” For that reason, he said, the rapid rise in texting has potential for great benefit and great harm.

“Texting can be an enormous tool,” he said. “It offers companionship and the promise of connectedness. At the same time, texting can make a youngster feel frightened and overly exposed.”

Texting may also be taking a toll on teenagers’ thumbs. Annie Wagner, 15, a ninth-grade honor student in Bethesda, Md., used to text on her tiny LG phone as fast as she typed on a regular keyboard. A few months ago, she noticed a painful cramping in her thumbs. (Lately, she has been using the iPhone she got for her 15th birthday, and she says texting is slower and less painful.)

Peter W. Johnson, an associate professor of environmental and occupational health sciences at the University of Washington, said it was too early to tell whether this kind of stress is damaging. But he added,

“Based on our experiences with computer users, we know intensive repetitive use of the upper extremities can lead to musculoskeletal disorders, so we have some reason to be concerned that too much texting could lead to temporary or permanent damage to the thumbs.”

Annie said that although her school, like most, forbids cellphone use in class, with the LG phone she could text by putting it under her coat or desk.

Her classmate Ari Kapner said, “You pretend you’re getting something out of your backpack.”

Teachers are often oblivious. “It’s a huge issue, and it’s rampant,” said Deborah Yager, a high school chemistry teacher in Castro Valley, Calif. Ms. Yager recently gave an anonymous survey to 50 of her students; most said they texted during class.

“I can’t tell when it’s happening, and there’s nothing we can do about it,” she said. “And I’m not going to take the time every day to try to police it.”

Dr. Joffe says parents tend to be far less aware of texting than of, say, video game playing or general computer use, and the unlimited plans often mean that parents stop paying attention to billing details. “I talk to parents in the office now,” he said. “I’m quizzing them, and no one is thinking about this.”

Still, some parents are starting to take measures. Greg Hardesty, a reporter in Lake Forest, Calif., said that late last year his 13-year-old daughter, Reina, racked up 14,528 texts in one month. She would keep the phone on after going to bed, switching it to vibrate and waiting for it to light up and signal an incoming message.

Mr. Hardesty wrote a column about Reina’s texting in his newspaper, The Orange County Register, and in the flurry of attention that followed, her volume soared to about 24,000 messages. Finally, when her grades fell precipitously, her parents confiscated the phone.

Reina’s grades have since improved, and the phone is back in her hands, but her text messages are limited to 5,000 per month — and none between 9 p.m. and 6 a.m. on weekdays.

Yet she said there was an element of hypocrisy in all this: her mother, too, is hooked on the cellphone she carries in her purse.

“She should understand a little better, because she’s always on her iPhone,” Reina said. “But she’s all like, ‘Oh well, I don’t want you texting.’ ” (Her mother, Manako Ihaya, said she saw Reina’s point.) Professor Turkle can sympathize. “Teens feel they are being punished for behavior in which their parents indulge,” she said. And in what she calls a poignant twist, teenagers still need their parents’ undivided attention.

“Even though they text 3,500 messages a week, when they walk out of their ballet lesson, they’re upset to see their dad in the car on the BlackBerry,” she said. “The fantasy of every adolescent is that the parent is there, waiting, expectant, completely there for them.”

Your Youth and Vitality Mentor, Dr. Rob Anderson,  Chiropractor of Vitality Chiropractic of Highlands Ranch.  Ironically you can follow the health tidbits of Dr. Rob at www.twitter.com/drrobanderson and www.youtube.com/roadtovitality  and www.tumblr.com/drrobanderson

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 Where is your head? 

No, the answer you are thinking of is not the answer I am looking for.  

You have seen pictures of the leaning Tower of Piza, right?  Have you ever just wondered why it doesn't fall over?  It doesn't look strong, stable or other wise attractive leaning at such a strong arc.

The most common type of poor posture is called Forward Head Syndrome, referred to as FHS.  It is the result of spinal subluxation and weak spinal structure where the head protrudes forward in front of the shoulders.  This decreases the healthy 45 degree curve of the neck. 

Medical research shows that when the head is one inch forward, the weight of the head pressure on the shoulders and lower back doubles.   So if my head actually weighs 12 pounds and because of problems in my neck, I carry it 1 inch forward of optimal then the actual weight on my shoulders is 24 POUNDS!!!  That is 2X the normal weight that my neck and upper back muscles have to support. 

Imagine going hiking and carrying a pack that weighs as much as you do....How tired would your legs be?   Exhausted.   It is no wonder your neck and back hurts like heck all the time. 

FHS tensions the spinal cord like an over-stretched rubber band causing compression.  This leads to nerve pressure and blood supply changes.  The spine degenerates and discs in the lower back wear out.  Medical and Chiropractic research shows that even metabolism slows because the thyroid is unable to perform normally.  Energy levels plummet.  Breathing shallows because the lungs are under pressure.  Sickness begins because the immune system is stunted on a continuous basis.

Do you get sick more than you think you should?   Greater than one cold a year is way too much.

Do you get out of breath easier than you think you should?   Imagine your lungs as a sponge getting squeezed.  There is just no air. 

Have you put on 10, 15, 20 even 50 pounds in the last while and cannot seem to lose it?  The nerves supplying the thyroid are under constant pressure with FHS. 

Are you more tired than you think you should be?  Go right back to the hiking analogy...Who could imagine having energy with that going on.

26 Year old Female:  2” Forward Head Syndrome (Left),  Very Significant Muscle Spasm on EMG (Center), 75% Loss of Curve (Right),  Disc and Joint Arthritis,  Constant Headaches, Pain in the Shoulders, Frequently ill and Lethargic.  

After 5 Months of Chiropractic care at Vitality:   Corrected Head Posture, 100% Healthy Curve, Perfected EMG Muscle Graphm, Increased Disc Height, Health & Vitality Completely Restored. 

Of all of the common structural problems that people face in life this one issue seems to have the greatest affects on health and vitality.  Get to a qualified chiropractor that can correct this life changing problem now, or it may be too late.     

What can you do if you think you or a loved one may suffer from Forward Head Syndrome?    Check some of the more common symptoms.  These are only some of the symptoms you may or may not have with FHS.  Muscle Lumps in the back of neck and shoulders,  Weight Gain, Fatigue, Headaches, Slumped Computer Posture, Rounding Shoulders, Shortness of Breath, Dry Skin and feeling cold often.  Schedule an evaluation with your chiropractor as soon as possible to verify this common problem.    

In Health,  Dr. Rob Anderson from Vitality Chiropractic, Your www.RoadToVitality.com Health Mentor.   Follow Dr. Rob and topics like this at www.twitter.com/drrobanderson & www.tumblr.com/drrobanderson