Metformin is a commonly prescribed diabetes drug, but it is also popular among biohackers and life extensionists who take it for what they believe to be its longevity benefits. While this use is still being investigated, new studies indicate that taking metformin may have some drawbacks, including a new study indicating metformin decreases the gains in respiratory performance brought on by exercise.

Previous studies have shown that respiratory fitness, as defined by an increase in VO2max, may have an impact in preventing hyperglycemia and type 2 diabetes, although the associated weight loss is also likely to contribute. The researchers of this study sought to determine if metformin impairs gains in VO2max the way it impairs muscle growth, as has been suggested by previous studies.

This study focused on the people most likely to be taking metformin: people with metabolic syndrome. A total of 72 overweight or obese men and women with an average age of 53 were separated based on whether they were taking metformin or not. 63 of these people were able to complete 16 weeks of high-intensity interval training, which focuses on exercise sessions that maximize heart rate in order to increase cardiovascular and respiratory performance. Metabolic syndrome, respiration, and blood glucose were among the biomarkers assessed. However, this was not a placebo-controlled study, and the baseline characteristics of the two groups were different.

Both groups were positively affected in every measurement of VO2max, but the researchers' hypothesis was correct: the improvements brought on by the exercise in this respect were significantly blunted in people taking metformin. While there was no significant difference in baseline measurements, the people who did not take metformin had better respiratory performance than the people who did.

Regardless of these results, it may be unwise to cease taking metformin if you were prescribed it by your doctor. As an inhibitor of blood glucose, metformin is prescribed for reasons that often outweigh the concerns raised in this study - but you should certainly ask your doctor any questions you may have.

But this study does illustrate a potential issue with metformin, particularly when it comes to people who would use it to augment their health, rather than to treat an existing condition.

Previous studies do show that at least some cohorts do not experience reduced mortality. However, many believe that this drug is still worth exploring as a longevity drug, which is why the team at Lifespan.io is working to support the long-awaited Targeting Aging with Metformin trial, or TAME trial. I am very much looking forward to the results of this study, and it should answer many lingering questions that we currently have.

SOURCES AND FURTHER READING
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Metformin is Linked to Weaker Exercise Improvements - [ Ссылка ]

Effects of chronic metformin treatment on training adaptations in men and women with hyperglycemia: A prospective study - [ Ссылка ]

Effect of Metformin and Lifestyle Interventions on Mortality in the Diabetes Prevention Program and Diabetes Prevention Program Outcomes Study - [ Ссылка ]

Targeting Aging with Metformin (TAME) Trial - [ Ссылка ]

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