Hunting and collecting ethnic groups in Africa turned out to sit as long as people in developed countries
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Living a long sitting life is said to cause various health problems . It is said that the fact that humans have been sitting for a long time is greatly affected by industrialization, but a new study says, `` Even hunting and gathering ethnic groups spend as much or more time as workers in developed countries. Spending time. '
Sitting, squatting, and the evolutionary biology of human inactivity | PNAS
https://www.pnas.org/content/early/2020/03/03/1911868117
Study of hunter-gatherer community shows that how humans rest may affect their risk for heart disease
https://phys.org/news/2020-03-hunter-gatherer-humans-rest-affect-heart.html
Modern hunter-gatherers are just as sedentary as we are | Ars Technica
https://arstechnica.com/science/2020/03/modern-hunter-gatherers-are-just-as-sedentary-as-we-are/
Prolonged sitting can cause a variety of adverse health effects, including reduced metabolism and obesity, and reduced blood flow to the heart, increasing the risk of cardiovascular disease It has been with. There is also a theory that if humans are left sitting for a long time, their health will be adversely affected, saying that `` we have lived a hunting and gathering lifestyle for millions of years, so humans are adapted to an active lifestyle '' However, there have been no studies that have actually analyzed the lifestyle of hunter-gatherers in detail.
A team
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The research team asked 28 Hazzas to live for a week with activity trackers on, and analyzed how much they exercised during the period. About 97% of the food consumed during the week by the Hazzes surveyed came from hunting and gathering from the surrounding nature, such as prey, berries and tubers caught in hunting That's right.
Analysis revealed that, surprisingly, the Hazza, a hunter-gatherer, did not exercise for much longer. It is said that a typical Hazza adult spent almost 10 hours awake sitting and sitting with little motion. The result of sitting and spending 10 hours a day is almost the same as the people of the Netherlands and the United States, and it is longer than the average of Australia.
Of course, there seemed to be a big difference between the Hazza people and the people of the developed countries, and although the Hazza people were not moving for a long time, they did active physical activity when moving their bodies It seems he was. The team also said that, although not statistically significant, they transitioned between non-moving and moving states more often than in developed countries.
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In addition, the research team installed cameras where the Hazars lived and investigated their “postures” while awake. As a result, it was found that the Hazzas rarely sit on logs or stones when they are not moving, and sit on flat ground in about half the time they sit. In addition, more than one-third of the time he sat, he found that he was 'squatting or kneeling'.
When the research team examined the muscle activity when crouching and kneeling using the electrodes, the posture of squatting and kneeling was greater than that of sitting on a chair He understood that. It is natural that the muscle activity is greater when walking, but it seems that the Hazzas people use more muscle compared to the general sitting in an industrialized society .
The Hazza have proven to be superior to those of the developed world in terms of heart-related health indicators. In this regard, the research team believes that squatting and kneeling sitting may have an effect. David Raichlen , a member of the research team and professor of biology at the University of Southern California, said, `` Being a couch potato on the couch and spending a lot of time sitting in the office chair is squatting. Muscle activity is less than kneeling, and lighter levels of muscle activity also require fuel, which generally means burning fat, so sitting and kneeling in a chair May not be as harmful as sitting down. '
On the other hand, the Hazza people who cooperated in this study had a significant impact on their heart health due to the fact that their dietary habits were significantly different from those in developed countries, and that they were active and active while moving. You may have given it. Nevertheless, the study does make an important contribution to the discussion of mitigating the negative effects of sedentary lifestyles.
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