To mean I don't believe in a true lean true bulk. I believe you can gain muscle with out gaining fat. I time my carbs right.
Muscle glycogen is the athlete’s storage form of carbohydrate and the primary fuel that powers intense exercise. A number of studies have demonstrated that intense resistance training can significantly decrease muscle glycogen stores, much more severely than previously suspected. If you restrict your carbohydrate intake (as most bodybuilders do), you run a real risk of training constantly on carb-depleted muscles.
Weight training with low muscle glycogen levels means weak muscles decreased force production, and significantly reduced strength. Muscle glycogen stores govern weight lifting performance, and the ability to train intensely day-in, day-out. Glycogen-full muscles means greater work capacity and greater intensity and this adds up to a more powerful growth stimulus.
Bodybuilders need carbohydrates to train intensely, build muscle and get shredded. However, to obtain optimal muscle glycogen stores, a high carbohydrate diet is not required nor recommended. The answer is carbohydrate timing. The intake of the right carbohydrates at just the right time results in more effective muscle glycogen accumulation, better recovery and a more potent muscle growth stimulus.
A lot of bodybuilders do not understand that the strategic consumption of carbohydrates just before and after intense training not only determines the success of today’s workout, but also the glycogen levels that fuel tomorrow’s workout.
The total amount of glycogen synthesized in muscle over a 24-hour period is directly correlated to the timing of carbohydrate ingestion after a workout. If carbohydrates are not consumed in the workout period, zero muscle glycogen synthesis and an empty fuel tank for tomorrow’s workout is the result. Whereas a few strategic servings of an easily absorbed carbohydrate consumed close to training will guarantee a high glycogen synthesis rate and glycogen-filled muscles to power cellular growth.
Don’t underestimate the importance of carb timing for triggering glycogen synthesis after a workout. Not only is a bodybuilders total work capacity correlated directly to the amount of glucose/glycogen held within muscle, the process of glycogen accumulation triggers an immediate “cell volumizing” effect, a potent anabolic response. The right carbohydrate timing strategy will amplify the anabolic stimulus of resistance training.
The research on carbohydrate intake and weight lifting shows that the consumption of a carbohydrate supplement just before (or during) an intense workout can save valuable muscle glycogen stores from complete depletion, as well as enhance total lifting capacity during the workout. While training without using a carb supplement before weight training results in muscle carb depletion, and poor weight training performance, supplementing just before or during training, results in only a decrease in muscle glycogen content and more weight lifted, for more reps in every working set!
A carbohydrate supplement consumed immediately before or after weight training is shown to directly affect the hormonal response. Taken before training, a carb supplement will maintain blood sugar levels, and restore insulin levels. The presence of insulin is vital for stimulating muscle protein synthesis rates. A carb supplement taken immediately after training increases insulin concentration while decreasing 3-methylhistidine and urea nitrogen excretion (all examples of reduced muscle breakdown).
Consuming a carbohydrate supplement after resistance training also enhances the growth hormone response and reduces circulating cortisol concentrations.[21,22] Cortisol is the number one glucocorticoids hormone that is responsible for muscle breakdown. Carb timing stops cortisol elevation dead in its tracks.
The benefits are as clear as night and day, and the strategy is remarkably simple. Be sure to consume a dose of carbohydrates just before and immediately after your training session, it will enhance work capacity and the hormonal anabolic response from weight training.
The link is not working so I copied and pasted. I Follow this year round and seems to help me a lot.