Forensic Anthropology and Bone Density

A few weeks ago, I attended a lecture on forensic anthropology. In general, this is the study of things you can tell from human bones in a crime setting. How old was the person? Were they male or female? How big were they? What was their probable race or ancestry?

Why was I there when my work is with the living? Two main reasons. I am the science officer for the Vidocq Society, an international forensic society. I might evaluate data, for example in an aviation disaster, whether someone might have been conscious at each point when undergoing G-forces or different temperatures and amounts of oxygen after a depressurization at various altitudes. In a scuba death, I might advise on physical changes that occur with different situations. The second reason was to learn more about bones. Bones are remarkable. Your bones know a lot about you. What was your health like? Were you active? What kind of activity did you do? When I was small, I read about an archaeological dig in ancient Rome. The bones of a girl were recovered. The account stated they could tell she carried loads too heavy for her, and was therefore (in conjunction with other evidence) probably a servant or slave. I was riveted. How could they know that? I spent years after that learning more about telling how someone moved from looking at their bones.

Throughout your entire life, when you exercise you stimulate growth of new bone cells. The physical pull of muscles thickens your bones where the muscles attach. Using your arm muscles thickens arm bones. Using your legs strengthens leg bones, and so on. This is a main mechanism of how exercise prevents osteoporosis. Without exercise, you don't stimulate enough new cells to counter the normal loss as old ones break down. Your bones thin no matter how much calcium you eat. The post Exercise is More Important Than Calcium Supplements for Bones tells more about this. Bone demineralization is rapid and serious in astronauts in microgravity (Collapsing Astronaut Gives Healthy Reminder).

How you use your muscles causes them to pull differently, giving evidence about the kind of habitual motion. More interesting is that when you are active, your bones grow and shape themselves to facilitate your motion. An example of interest to readers following the posts on squatting is that people who habitually sit for normal daily life in full squat grow "squatting facets" on their lower leg bones. These are small areas on the bone that quickly grow to make squatting more comfortable. At one point, it was a debate in anthropology that squatting facets were a marker of someone of Asian ancestry, until it was found that others who squat also grow them, and that squatting facets disappear when the person adopts a Western sitting habit of chairs and no longer squats. Babies of all races can have them.

Someone who habitually slouches can change the shape of their bones, eventually deforming them. This can occur in the spine, knees, hips, ankles, shoulders, feet, toes - everywhere you pressure your bones. Changing positioning habits to healthier ones can, in many cases, reshape the bones back to healthier shape. Think of braces on your teeth. It's human bonsai. In cases of extreme dystrophies of the muscles, someone who sits without function of their trunk muscles to hold the spine upright, can eventually deform their spine until their ribs sit on their hip bones. How are you sitting right now? The recent post What Does Stretching Do? explained a bit of why stretching isn't reducing injuries. People are stretching, then exercising and going about daily life in bent over positions that rub and grind the joints and soft tissue.

You literally shape your own health. Use the posts throughout this Fitness Fixer blog to do healthy exercise in healthful positioning so that your bones will only tell good tales about you.

Labels: achilles stretch, aerospace, ankle, arm, feet, forensic, injury, leg stretch, osteoporosis, posture, scuba, sitting, squat, toes

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Fixing Fitness Myths

"The public has an insatiable curiosity to know everything, except which is worth knowing." - Oscar Wild

April 1 seems to be a day to notice, more than usual, if things in the news are not facts but April Fool. On other days, urban legends and other stories are still popular, sometimes more popular than what is really going on.

The observation that the Earth is flat seemed obviously true at one time until we had more information. It used to be a taught as a medical fact that the cause of epilepsy was masturbation. When I was in school, one of my medical books stated that you don't need to eat calcium since you can "get all you need from your bones." It is true that you pull calcium from your bones when you don't eat enough, although with unhealthy results.

The post Forensic Science told of two crime-science myths, often still taught in forensic books and popularized in television shows, which were never true. Following are more posts hoping to replace myth with information, so that you can get stronger and do more, without the injuries or restrictions in activity that are part of many fitness or injury rehab practices.

Feet and Ankles

Myth - You need tight shoes for support. Fact - tight shoes can deform toes and prevent healthy muscle use:
Are Your Shoes Too Tight?
and Healthy Toe Stretches.

Myth - All ankle stretches prevent sprains. Fact - Some may enhance predisposition to ankle sprains:
Unhealthy Yoga Ankles.

Myth - Following an ankle sprain, bracing must be continuous since no exercise can restore the area. Here is another way -
How To Treat Ankle Sprains and Prevent Them
and
No More Ankle Sprains Part II.

Dispelling Myths of Orthotics Use:

Myth - Only orthotics can place your arches in neutral position. Fact - your own muscles can often do the same:
Arch Support Is Not From Shoes
and
Which Shoes Help Exercise, Fall Prevention, and Ankles?

Dispelling Aging Myths - That respiratory function only declines with age:

Do Breathing Exercises Work?

Dispelling Aging Myths - That you only get weaker with aging:

Getting Stronger is for Everyone
What I Learned at the Aging Conference
Better Balance by Christmas
Conference on Aging Dec 2, 2006 in Midtown New York.

Dispelling Nutrition for Exercise Myths:

That weight gain with aging is primarily lower metabolism: Metabolism - How to Lose Weight and Save Money

or that Healthy eating is difficult or expensive:
What Medical Students Told Me About Nutrition.

Myth that you must eat much protein to get muscles:
Get Muscles for Christmas

Myth that acid prevention drugs are harmless:
Stomach Acid Drugs May Increase Osteoporosis and Hip Fractures

Myth that food marked "Health Food" means it has to be healthy:
Is Your Health Food Unhealthy
and Exercise Common Sense Discipline - Turn Down Halloween Junk Food

and the myth that it's healthy for children to eat junk food:
A Little Good Exercise, a Lot of Bad Food - Overweight Still No Mystery.

Myths that only gyms and weights can improve your strength:

How to get natural exercise is in Rocky IV and Healthier Exercise,
Getting Stronger Without a Gym
Exercising With A Friend - Partner Leg Press
Don't Confuse Exercise With Real Fitness
Healthy Toe Stretches
Quick and Fun Arm and Body Strengthener
and Quick and Easy Strength and Balance Exercise.

More to come for smart, fun, healthier ways to get exercise.

Labels: aging, ankle, arches, arm, balance, breathing, feet, fix pain, forensic, holiday, leg stretch, myths, nutrition, osteoporosis, partner exercise, shoes, sprain, strength, toes, yoga

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Forensic Science

Last weekend we visited the Siriraj Forensic Science museum in Bangkok (pronounced Silly-lot). Forensics is the science of crime. Why are we here?

I am the science officer for the Vidocq Society (pronounced Vee-doc), an international forensic think-tank for solving cold case murders. The Vidocq Society is named after the eighteenth century French detective Eugène François Vidocq, who is considered the founder of modern criminology. Vidocq was a former fugitive and police informant, and expert in surveillance and disguise. In his career-reversal, working in crime prevention, Vidocq was the first to make plaster casts of foot and shoe impressions, and introduced record-keeping and the study of ballistics into police work.

The Vidocq Society allows 82 members by invitation only. As the science officer for the Vidocq Society, my job is to make sense of some of the physiology and facts about the body used (and often not used) in forensic investigations. Real forensics is not like television forensics and often techniques shown on television are exaggerated, applied incorrectly, interpreted badly, or just false. Part of my job is to learn enough to help make sure we don’t do the same in real life.

It is important to check things, even if accepted as fact. For example it is not true that you can tell when someone died from their body temperature or stiffness. You can’t just check the books. Many of the most held old fallacies, were things we learned in school and from forensic books. Health and fitness is like that too. We just need to look a little further to learn how things really work.

Photo by 13bobby

Labels: forensic, injury

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