...e melhor compreendida:
http://www.mirror.co.uk/science/scientists-think-know-what-causes-8790932
Citando:
"Prof Wilkin said calories are burnt off in two ways - voluntary spend through physical activity and the much larger involuntary spend, simply to stay alive.
Thinking, keeping blood warm, and keeping the heart, liver and kidneys working together use up to 1,600 calories per day in adolescence."
(...)
"Burning calories uses a fixed amount of oxygen, so the children rested in a sealed canopy and their oxygen consumption was measured over a period of time, to enable researchers to calculate their calorie use from the amount of oxygen consumed."
(...)
"Prof Wilkin said: "When we looked for an explanation for the rising obesity in adolescence, we were surprised to find a dramatic and unexpected drop in the number of calories burned while at rest during puberty.
"We can only speculate as to why, but it could be a result of an evolutionary trait to save calories for growth that may now contribute to a dangerous rise in adolescent obesity in cultures where food is in abundance.
"It could be that we have evolved to preserve calories to ensure we have enough to support changes in the body during puberty, but now they have sufficient calories each day, the drop in spend means excess weight gain.""
Mostrar mensagens com a etiqueta Oxigénio. Mostrar todas as mensagens
Mostrar mensagens com a etiqueta Oxigénio. Mostrar todas as mensagens
domingo, 11 de setembro de 2016
quinta-feira, 9 de junho de 2016
Bubbly drink trial 'to boost cancer therapy' - BBC News
Bubbly drink trial 'to boost cancer therapy' - BBC News
Citando:
"One reason thought to behind this is that cancers grow rapidly and their blood supply fails to keep up - leaving tumours with torturous, poorly-formed blood vessels that don't deliver oxygen-rich blood as well.
Prof Eleanor Stride, from Oxford University, says the lack of oxygen makes cancer cells "go into survival mode" making them more hardy and therefore less responsive to radiotherapy and drugs.
This is a particular problem for hard-to-treat cancers such as tumours of the pancreas, she says.
The team has already found that injecting oxygen in mice with cancer and then giving them chemotherapy leads to more successful treatments.
They recently carried out a small-scale trial of an oxygen-rich drink in mice.
The next stage is to repeat the mice experiments in much larger numbers, before human trials are considered.
But Prof Stride says: "I wouldn't suggest people rush out to buy any drinks claiming to be rich in oxygen."
Citando:
"One reason thought to behind this is that cancers grow rapidly and their blood supply fails to keep up - leaving tumours with torturous, poorly-formed blood vessels that don't deliver oxygen-rich blood as well.
Prof Eleanor Stride, from Oxford University, says the lack of oxygen makes cancer cells "go into survival mode" making them more hardy and therefore less responsive to radiotherapy and drugs.
This is a particular problem for hard-to-treat cancers such as tumours of the pancreas, she says.
The team has already found that injecting oxygen in mice with cancer and then giving them chemotherapy leads to more successful treatments.
They recently carried out a small-scale trial of an oxygen-rich drink in mice.
The next stage is to repeat the mice experiments in much larger numbers, before human trials are considered.
But Prof Stride says: "I wouldn't suggest people rush out to buy any drinks claiming to be rich in oxygen."
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