blood cells that carry oxygen within the body. Interestingly, scientists have discovered that the time of day when the highest levels are found in the blood is 8 am, while 8 pm is the time of day when this rate Is the lowest. Does this mean that training in the morning has a greater impact on muscle growth? Not necessarily. It remains to be determined whether, depending on the time of day, the impact on training outcomes is different. In all cases, let us now consider the relationship between levels and the training methods used. DO BODYBUILDING AND INTERVAL TRAINING INFLUENCE MY LEVELS? Actually, there .