Acesseo link abaixo e veja a Materia no Bom dia Brasil onde o Diretor da ABRColuna edo ITC Vertebral Ribeirao Preto (Dr. Giuliano Martins) fala um pouco sobre esse assunto. http://g1.globo.com/bom-dia-brasil/videos/t/edicoes/v/uso-excessivo-de-celular-pode-causar-serios-danos-a-saude-diz-pesquisa/3803515/Humans were designed to stand upright. And yetin this modern world, too many of us spend our days with our heads slumped overfor a simple reason: we're staring at the tiny screen of a smartphone.People spend an average of 2 to 4 hours each daywith their neck bent at this unnatural angle while shooting off emails ortexts. That's 700 to 1,400 hours a year. The success of social media is has ledto an epidemic of bad smartphone posture.The average adult head weighs 10 to 12 poundswhen it's in the upright or neutral position. However, because of that peskything called physics -- gravitational pull -- the cranium becomes heavier themore you bend your neck. Several times heavier, according to research from Dr.Kenneth Hansraj, chief of spine surgery at New York Spine Surgery andRehabilitation Medicine, which will be published in Surgical TechnologyInternational.His study found that bending your head at a 60degree angle to get a better look at your selfie is putting 60 pounds' worth ofpressure on your cervical spine, the portion of the spine above the shoulders.That's more than the weight of the average 7 year old."The weight seen by the spine dramaticallyincreases when flexing the head forward at varying degrees," write theauthors in the study. "Loss of the natural curve of the cervical spineleads to incrementally increased stresses about the cervical spine. Thesestresses may lead to early wear, tear, degeneration and possibly surgeries."But it's not just the big slump that couldeventually cause you to look like Lurch. Tilting your head a mere 15 degreesputs 27 pounds of pressure on your spine; a 30 degree neck tilt could equal 40pounds of pressure; a 45 degree tilt adds the force of 49 pounds.It's no secret that correct posture is betterfor your back. According to the researchers, "good posture is defined asears aligned with the shoulders and the 'angel wings,' or the shoulder blades,retracted.""In proper alignment, spinal stressdiminished," they write in their paper. "It is the most efficientposition for the spine."Standing tall doesn't just make you look better,it optimizes your health, too. Other studies have found good posture elevatestestosterone and serotonin in the body, and also reduces levels of the stresshormone cortisol. Good posture has even been linked to personality traits suchas tolerance for risk-taking.People who have poorer posture often have poorerphysical and emotional health. The researchers define bad posture as "thehead in a tilted forward position and the shoulders dropping forward in arounded position."Bad posture has been linked to a host of medicalproblems, including headaches and other neurological problems, depression,constipation, and heart disease. At a minimum, constant slouching is likely tocause a lot of chronic pain.This is why Hansraj said it's important to bemindful of your smartphone posture."While it is nearly impossible to avoid thetechnologies that cause these issues, individuals should make an effort to lookat their phones with a neutral spine and to avoid spending hours each dayhunched over," the authors write in