1 nervous fatigue:
each will do the action of central nervous system transmitted a nerve impulse to the body, the muscles to contract instructions, and to coordinate the operation of the complete cooperation between the limb portions.
Nerve-related fatigue with the following:
A. First, the amount of movement of the load, which is particularly evident in weight training, the larger the load, the more work. Neural more fatigue, because the larger the load, the more the need to raise the motor unit.
b. Second, the more complex movements, the unskilled, the more nervous fatigue, because of the need for more coordination with the workplace.
c. Again, the training intensity (density) higher, the more nervous fatigue, and this is the same as the nature of other body organs.
d. The last Similarly, is the total amount of training.
So, we put the exercises according to the degree of nervous fatigue divided into several categories:
第一类, 抓举, 挺举, 高翻, 跳箱（近极限高度）这类, 大量需要协调配合和负荷量很大的, 这类最容易引发神经疲劳, 因此, 训练总量和密度都不能高, 表现在训练中就是每组次数不能高于5个, 而组间歇则要长一些。
第二类, 深蹲, 硬拉, 或类似的动作（泽奇深蹲, 相扑硬拉等）这类动作负荷量巨大, 调动肌群多, 但协调需求没第一类高, 所以神经疲劳引发没第一类强, 训练中应该在力竭前 减1, 2次动作就停下来。
第三类, 卧推, 杠铃划船, 这类调动肌群较多, 负荷量也不小, 但做功和配合都少于第二类, 所以 神经疲劳也更小一些, 在训练中可以练到力竭, 但不用每一组都力竭。
第四类, 是孤立肌肉训练动作, 比如 变举, 臂屈伸, 这类不需要肌群配合, 对神经疲劳最低, 所以可以完全练到力竭。2 ATP energy supply shortage fatigue:
the anaerobic weight training, the significance of the group is intermittent reply ATP, ATP refers to adenosine triphosphate.
Is a direct human cells fuels for energy (all living things) and ATP's reserves are very low, generally depleted in about 10 seconds, and a set of actions, this time is almost, but creatine is transformed into each other to promote ATP and ADP the intermediate species, creatine can be regarded as secondary fuel second only to the ATP, creatine is generally in animal foods can be supplemented, if consumption is too large, the role of creatine supplements is manifested.
Fatigue acid 3:
After the exhaustion of ATP stored in the body, which is set in a batch, then the sugar will be anaerobic glycolysis for energy conversion of ATP, this time will produce lactic acid, may be in aerobic metabolism while lactic acid as energy, but if anaerobic metabolism is much faster than oxygen, that lactic acid accumulation to a certain extent it will make your muscles ached, it is difficult to continue training.
4 glycogen fatigue:
after about half an hour continuous motion, the body will run out of glycogen, although this time may gluconeogenesis born fat for energy, but the energy supply will slow down, exercise performance in terms of maximum strength and explosive power It will be reduced. Of course, this time is the time constant motion, and weight-bearing mostly intermittent mode, this time can be a lot longer (here HIIT interval training means not only sports three modes "continuous cycle, intermittent" one of) the use of sugar movements beverages enhances athletic performance over time.
5 full body fatigue: the role of the above several common fatigue accumulation, not at this time and movement, it should be a good rest.