Clinical research still hasn’t determined a hard threshold level for when symptoms of low T begin appearing . Some recent research suggests that symptoms of low T might begin appearing in men when their total testosterone level dips below 320 ng/dl . According to anecdotal evidence from the owner of Peak Testosterone, many men start noticing low T symptoms when their total testosterone dips into the 400s . Of course, it’s anecdotal, so take it for what it’s worth, but it’s probably a good idea to stay above 500 ng/dl if you don’t want to experience symptoms of low T.
Helpful article, however, I will have to disagree with your comment about sprinting. Sprinting is a maximal effort exercise which constitutes the body’s reliance on predominantly carbohydrates and not fat. The fast catabolism of carbohydrates causes the lactic acid build up. The maximal exercise will actually not burn any fat but will boost testosterone levels. Also, the exercise can produce increased muscle mass, which can increase resting energy expenditure. Since your body burns predominantly fat at rest this can indirectly help you lose fat weight. If a person wants to become more efficient in metabolizing fat and lactic acid, they should focus on long duration (greater than 30 minutes) and low to moderate intensity exercises (~20-60% MHR)