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Intermittent fasting is a huge trend now, how ever how effective is this diet when it comes to gaining muscle and strength. This study used an 16/8 type of intermittent fast most common on Muslim religions.
My take on this. While in the 29 day period these subjects did not lose any muscle mass, the subjects who training after eating did gain strength. Over time, these strength gains will lead to muscle hypertrophy. So while fasting is not optimal for resistance training, it may be possible to get around the negatives by training in a non-fasted period.
While this study did not test strength in either group they did find body mass and body fat percentage remained unchanged in FAST and FED during the whole period of the investigation. So it appears that intermittent fasting is not going to cause a change in body mass if you are still eating enough calories above basal metabolism, exercise and TEF. In order to cause a change in body fat levels you are most likely going to have to be in a negative caloric balance for the entire period you do the fasting. This diet did seem to show some healthy changes in urine samples.
One thing I want to point out with the comparison is Ramadan is a religious celebration and the amount of calories you eat after sundown until sun up is not a concern at all. In fact, "the ultimate goal of fasting during Ramadan is gaining greater God-consciousness, known in Arabic as taqwa, signifying a state of constant awareness of God. From this awareness a person should gain discipline, self-restraint and a greater incentive to do good and avoid wrong." Those that do intermittent fasting are doing this only to change body composition and be healthy. That being said, it is even more important that those who do intermittent fasting understand that training while fasted is not optimal for gaining muscle or strength, like wise being in a negative caloric balance is also not optimal.
Timing of Resistance Training During Ramadan Fasting and Its Effects on Muscle Strength and Hypertrophy - PubMed
Practicing RT during RIF appears not to have adverse effects on muscle hypertrophy and strength no matter whether it is practiced in FED or fasted state. However, RT had greater effects on muscle strength when applied in FED. Our findings suggest that training sessions should be scheduled after...
pubmed.ncbi.nlm.nih.gov
My take on this. While in the 29 day period these subjects did not lose any muscle mass, the subjects who training after eating did gain strength. Over time, these strength gains will lead to muscle hypertrophy. So while fasting is not optimal for resistance training, it may be possible to get around the negatives by training in a non-fasted period.
Effect of fed- versus fasted state resistance training during Ramadan on body composition and selected metabolic parameters in bodybuilders - PubMed
Hypertrophic training in a fasted or in a fed state during Ramadan does not affect body mass and body composition of bodybuilders. Additionally, Ramadan fasting induced changes in urinary and some biochemical parameters, but these changes were not different according to when the training occurred.
pubmed.ncbi.nlm.nih.gov
While this study did not test strength in either group they did find body mass and body fat percentage remained unchanged in FAST and FED during the whole period of the investigation. So it appears that intermittent fasting is not going to cause a change in body mass if you are still eating enough calories above basal metabolism, exercise and TEF. In order to cause a change in body fat levels you are most likely going to have to be in a negative caloric balance for the entire period you do the fasting. This diet did seem to show some healthy changes in urine samples.
One thing I want to point out with the comparison is Ramadan is a religious celebration and the amount of calories you eat after sundown until sun up is not a concern at all. In fact, "the ultimate goal of fasting during Ramadan is gaining greater God-consciousness, known in Arabic as taqwa, signifying a state of constant awareness of God. From this awareness a person should gain discipline, self-restraint and a greater incentive to do good and avoid wrong." Those that do intermittent fasting are doing this only to change body composition and be healthy. That being said, it is even more important that those who do intermittent fasting understand that training while fasted is not optimal for gaining muscle or strength, like wise being in a negative caloric balance is also not optimal.
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