MADE TO MOVE
Wednesday, June 2nd, 2010
The Upper Paleolithic Periods of the Stone Age and is a prehistoric era from about 40,000-8,000 years ago. During this period humans grouped together in small societies of 25-100 people, and subsisted by gathering plants and hunting or scavenging wild animals.
Researchers have studied activity patterns from those who lived in that time and found that these hunter-gatherers engaged in several days of fairly intensive physical activity followed by days of rest and light activity. Men would hunt for 1-4 days consecutively each week and women gathered every 2-3 days. Other movement types identified include: tool making, butchering, food preparation, carrying firewood and water, and moving to new campsites. Interesting, dances that lasted hours, were identified as a major recreational activity in many cultures! Does anyone else think that’s really cool like I do?!?!
Why is this important? We still possess late Paleolithic, pre-agricultural hunter-gatherer genes. Therefore, we’ve inherited genes for physical activity, as physical activity was necessary for our ancestor’s survival. However, in our society where food is abundant, for many, movement is no longer obligatory for survival and this creates problems.
A sedentary lifestyle disrupts how our cells speak to each other which affects the types of proteins our genes produce. Thus, physical INACTIVITY becomes an initiating factor in the molecular mechanisms of disease, which is likely the reason why being sedentary is associated with a higher incidence of chronic conditions. In fact, physical inactivity affects at least 20 of the most chronic and deadly medical disorders as these conditions share common genetic inheritances that were supported by physical activity. When physical activity diminished, chronic health conditions occurred.
AN INCOMPLETE LIST OF PROBLEMS ASSOCIATED WITH INACTIVITY:
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Breast cancer |
Sedentary females, compared with physically active women, are less likely to have primary and secondary anenorrhea, delayed menarche, and irregular cycles, all associated with a reduced development of breast cancer. |
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Colon cancer |
Physical inactivity was the risk factor most consistently shown to be associated with the increased risk of colon cancer. A 50 percent reduction in the incidence of this disease was found in those with the highest level of physical activity. |
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Pancreatic cancer |
Walking or hiking less than 20 minutes a week was associated with twice the risk of pancreatic cancer when compared with those who performed the exercise for more than four hours a week. |
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Melanoma |
Sedentary men and women had a ~55-75 %, respectively, higher incidence of melanoma than those exercising 5-7 days a week. |
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Heart / arterial disease |
Undertaking a moderate-intensity physical activity would prevent 250,000 deaths each year, 12 percent attributed to these medical conditions. |
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Congestive heart failure |
Exercise may improve the condition of people afflicted with this disorder; physical inactivity may be a determinate factor to their time of death. |
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Hypertension |
Tests found that inactivity led to blood pressures in sedentary individuals being substantially higher than in those who were active. |
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Stroke |
Physical activity lowers blood pressure, facilitates weight loss, and decreases the chance for Type 2 diabetes, a major cause of strokes. |
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Type 2 diabetes |
Most of the prevalence of Type 2 diabetes in the US can be attributed to a change in lifestyle that involves a genome evolved from a Paleolithic lifestyle. Cultures that still have hunter-gatherers have low incidence of this disease. |
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Obesity |
Sedentary individuals can lower their risk of many disorders by increasing their physical activity, regardless of whether they are normal or overweight. |
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Osteoarthritis |
Appropriate exercise, both therapeutic and recreational, is an effective therapy in the successful management of this disorder. The benefits are flexibility, muscular conditioning, and cardiovascular and general health. |
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Rheumatoid Arthritis |
Exercise for patients with this disorder minimizes loss in muscle strength but not in bone loss. |
Have you moved today?
Citation: Booth, 2002. J Appl Physiol



