Why 45 minutes-hour?But, you need to do it for about 45 minutes to an hour.
That is one theory, but no one actually knows why that seems to be the case. For the record, it would have to be extremely cold water for bodyfat retention to occur as a protective mechanism. I wrote about it in Leigh's book that you can get by signing up for her newsletter here:The only tendency with swimming though is that consistent swimmers will sometimes have a slightly higher body fat percentage (not much though) possibly because of the body wanting to keep as warm as possible in cold water.
I know: I was trying to add to that infoI said possibly...which means that it could be one reason, but there could be another. Just putting out some info.
The ACSM cardio exercise recommendations (all of their recommendations, actually) are fairly conservative and outdated at this point. SS cardio as a primary weight control device has been shown to be not only poor as compared to other methods such as weight training and interval training for fat loss in more progressive research as well as practical real-world applications. At this point, I view SS cardio as a recovery agent or mixed protocol tool at best, definitely not as a fat loss tool by itself. Also, the energy substrate used during activity makes little difference: fat loss has more to do with total energy expenditure coupled with maintaining metabolic rate.The reason 45 minutes to an hour, is because the ACSM recommends 30 minutes of light to moderate aerobic exercise per day to maintain body weight. Additionally, it takes about 45 minutes of straight aerobic exercise done at a light to moderate pace for fat to become a source of energy.
I would disagree with that statement: endocrine response alone will complicate the process, and that's ignoring energy intake as well as metabolic and physiological adaptations. The ACSM is significantly behind the times as far as general population training is concerned (special populations and clinical physiology is still very good).There are other ways and really any kind of exercise is beneficial, but the 45 minutes-1 hour most, if not all days, is enough for about 1-2 pounds of fat loss per week, which is what is recommended.
The reason 45 minutes to an hour, is because the ACSM recommends 30 minutes of light to moderate aerobic exercise per day to maintain body weight. Additionally, it takes about 45 minutes of straight aerobic exercise done at a light to moderate pace for fat to become a source of energy.