When you put in hours at the fitness center, you fitter expect to get. It turns out, that assumption doesn’t hold true for everybody. A fresh study suggests specific genes may determine, at least partly, how much we benefit from exercise really. More women opting for preventive mastectomy – but as long as they be? Rates of women who are deciding on preventive mastectomies, such as Angeline Jolie, have increased by around 50 percent lately, experts say. But many doctors are puzzled because the procedure doesn’t bring a 100 percent assurance, it’s major surgery — and women have other available choices, from a once-a-day tablet to careful monitoring. 5. What stresses moms most?

While “benefit from exercise” can mean plenty of things, from shedding pounds to boosting one’s ability to complete a marathon, the experts looked at what is called VO2 potential specifically, or aerobic capacity. That is a way of measuring how much blood your heart pumps and exactly how much oxygen the muscles consume when they constrict to, say, move your hip and legs on a fitness treadmill.

Bottom collection, VO2 max represents your endurance. And this scholarly study, today in the Journal of Applied Physiology complete, suggests several 29 genes could categorize individuals into low possibly, medium and high responders to exercise. The experts stress that exercise has benefits, of if a person can improve aerobic capacity regardless. You can lose weight still, and other health factors such as cholesterol levels could benefit.

Pain, but no gain? Theoretically, the greater you teach, the better your system should get at using oxygen, as well as your VO2 max should increase. Indeed, elite athletes frequently have high VO2 max’s weighed against average Joe. However, about 20 years ago, some researchers started to question whether or not the hyperlink between training and fitness level was so clearcut. In that scholarly study, some social people could increase their VO2 max up to 50 percent, while some saw no change. Because the scholarly study involved about 100 families, Bouchard’s team could check to see if genetics was at play.

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Indeed, it was. Genes could account for about 50 % of the difference these were seeing in people’s capability to increase their VO2 potential. Quite simply, a good part, but not all, of someone’s capacity to get more fit was set by their heredity. The question became, what genes? To learn, Bouchard and his colleagues, who originated from 14 different institutions, used data from three split exercise studies, like the Heritage.

They initially identified, using a novel approach, a set of 29 genes that seemed to predict someone’s ability to improve their VO2 max. Then, they analyzed the individual DNA sequence of these genes, looking for differences in the genetic code. They found a total of 11 DNA variations, or markers, which were predictive of someone’s ability to get fitter.

But these markers don’t inform the whole story. Remember, heredity is only thought to account for 50 percent of a person’s capacity to improve their fitness. Of this 50 percent, the recently identified genes can only just explain about 23 percent of the deviation within an individual’s capability to learn to boost VO2 max. In addition, in the Heritage study, the people who improved their fitness (VO2 potential) the most weren’t always the ones who improved their blood pressure the most, or lowered their cholesterol. So these factors, which are thought to be indicators for heart disease risk, could be managed by different genes, Bouchard said.

While Bouchard seems this study is a big step forward, more work is needed before it can have real-world applications, including finding more genes and verifying the markers in other populations then. But down the road, the findings may have practical uses. For instance, if someone learns these are a “low responder” to exercise, they know they could have to be more aggressive using their training in order to see an increase in their endurance.

It also may help out with job selection, if employment requires a high level of fitness. While other scientists agree that the ongoing work is intriguing, and notable because of its unique approach to find and verify genes, they feel more research is needed. Paul Gordon, teacher at the University of Michigan who specializes in precautionary and rehabilitative exercise research. For example, the actual genes discovered in this study were different from those previously found to play a role in the exercise-VO2 max link. And researchers know hardly any in what these genes do to cause physical improvements in the body really.