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Does cardio burn muscle, deadlift vs squat - Plans Download

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So it is not necessarily the cardio that is burning the muscle, is the lack of calories, dangerously low body fat percentage, and protein intake. In the fitness world, cardio performed at medium to high intensity for OVER an hour is seen as the marker for your body to enter the muscle burning state. So in summary, cardio will burn muscle if you are severely overtraining or you are not consuming enough calories.
Training that involves using the muscle during an anaerobic state (weight lifting, sprinting, etc) can cause sarcoplasmic hypertrophy. On the contrary, training that involves using the muscle in an aerobic state (distance running, cycling, etc), doesn't induce (as much) sarcoplasmic hypertrophy, and therefore the muscle does not swell in size (that's not to say myofibril hypertrophy doesn't occur).
So to answer your question, aerobic exercise doesn't lead to muscle loss -- it just doesn't contribute strongly to (sarcoplasmic) muscle growth.
Cardio training doesn't necessarily lead to muscle loss, but generally, training time is limited, and if you're preparing for a marathon, you don't have the time to spend in the gym, and your body will be busy adapting to the stresses of long distance running, which are different than the adaptations needed for sprinting 100m, dunking a basketball, or moving heavy things around.
This doesn't mean that their "overall fitness" is lower than that of a powerlifter or sprinter. Smaller bodies are lighter, and the muscles themselves also burn more energy if they are bigger, exactly like car engines.
Part of the difference that you are noting is genetic; some people are naturally better at aerobic sports, and some are better at putting muscle on.
For a given person, however, the answer to your question is that your body will optimize to keep muscles that are being used and eliminate muscle that is not being used.
Long-period aerobic exercise - such as long-distance running or cycling - is uniquely good at tearing down unused muscle. I will note, however, that pure steady-state cardio isn't the most effective use of training time for most people; HIT training will give them both a larger cardio training effect and improve their anaerobic fitness as well. They fear adding cardio to their workout regimen for fear that it will stunt their grown in size and strength.
To achieve a state of burning fuel as a primary energy source, carbohydrate intake should be less.

Try to keep your cardio within the hour and it will be very safe that your body will not lose your lean muscle mass. Next time your friends say that don’t want to do cardio because it will burn muscle, you can tell them that they may be wrong! Aerobic training simply stops doing so very quickly, since it doesn't require much strength to perform. Gaining strength and muscle mass means demanding the body perform at or near maximal strength and muscular exertion.
Every exercise leads to muscle increase, but only in that amount that is needed to handle the situation. Having big muscles, you can run the marathon, but the best efforts have those who looks as those runner from people, because they burn less energy.
I was one on trekking camp where all were measured for calory burn and the relation between muscle mass and calory burn were very clear. Glycogen and glucose are burned to turn adenosine DI phosphate (used up ATP) back into ATP so that it can be used again. This is mostly because of the nutritional requirements of those sports; you are in the aerobic zone for a long time and burning lots of calories, and some of those will come from protein.
Your fat stores are your body’s last resort for energy but if your body fat stores are really low and you are not consuming enough calories, your body will resort to cannibalizing your muscles.
One way it does this is via DOMS (delayed onset muscle soreness) where your body will become sore after an intense workout as the body recovers and grows. Gaining greater cardiovascular ability means demanding the body perform low-level exertions repeatedly.
This comes from muscle stores, liver stores, and fat stores in varying proportions according to exercise intensity. Also, after the exercise is over, your body will want to rebuild carbohydrate stores and it may tear down muscle mass to get there. Another way cardio helps gain muscle is by getting you in better shape for your weight lifting workouts.

As expected, the runners lost a lot of fat, but their muscle mass showed some interesting insight. Athletes engaged in sports or training where a preponderance of the training load is spent in aerobic efforts witness decreases in muscle mass, strength, speed, and power. The body is more stressed by the requirements of repeating the exercise over a period of time than by the strength required for executing it, therefore recovery is focused on improving the body's ability to perform over a period of time rather than muscle gain. So in a sense yes, some energy is spent bringing it, but mostly it's a function of how long and at what intensity your muscles work. Although ketosis will allow for greater burning of fat stores, your energy will be less and your performance may suffer.
Without essential amino acids, your body will have no choice but to break down your own muscle to get them. Cardio exercise actually helps to build muscle by enhancing recovery from weight training by promoting blood flow and oxygen transport to your muscles.
You can, however, hit a balance, and if you don't do a ton of cardio, the effect isn't that big.
If these people with dangerously low body fat percentage were to perform excessive amounts of cardiovascular exercises without consuming a sufficient amount of calories, they will most likely start to burn muscle.
This means that they lost muscle only as a product of overtraining the leg muscles and not from the cardio itself. If you are not in good enough shape, then you will simply be unable to complete the workout and and you will not get the muscle gains you could have gotten had you been in better cardiovascular shape. It is important to consume a sufficient amount of carbohydrates before and during exercise to give your body the fuel it needs so that it doesn’t enter a catabolic state.

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