Why do people with the same weight have different strengths? Take you through 6 factors that affect muscle strength

Since ancient times, mankind has a great desire for power, because power is usually the best way to prove their strength. Facts have proved that through reasonable physical activity and exercise, strength will be greatly improved, but many people will have this question: Why do people with the same weight have a great gap in strength? This article will take you to understand what factors affect our muscle strength.

Muscle volume

The increase in muscle volume (muscle hypertrophy) will directly cause an increase in muscle strength. The study found that the strength of the force is positively related to the weight. Generally, the greater your strength, the greater your weight, but muscle volume is not the only factor affecting muscle strength.

The mechanism of muscle hypertrophy includes two aspects: acute muscle hypertrophy and chronic muscle hypertrophy. Acute muscle hypertrophy usually occurs within a few hours after exercise and is caused by plasma accumulation in muscle spaces and edema between cells. Chronic muscle hypertrophy is a phenomenon of muscle hypertrophy that occurs during long-term exercise and is a change in muscle structure. The main reason is hypertrophy that occurs when the cross-sectional area of ​​muscle fibers increases or the number of muscle fibers increases. Usually high resistance training is the main method for increasing muscle fibers.

Muscle length

Muscle length can affect the strength of muscles. Muscle length determines muscle contraction and muscle elasticity. Studies of complete muscle length and muscle strength have shown that to a certain extent, the greater the length of the muscle, the greater the tension it produces, which means that if your muscle can be stretched within the effective range, the relative strength Will be bigger.

Muscle contraction rate

Studies have shown that there is a certain relationship between muscle strength and muscle contraction speed. With a linear increase in the speed of centripetal contraction, muscle strength will show a non-linear decrease. Later, the study found that with the linear increase of muscle eccentric contraction speed, muscle strength showed a corresponding increase.

Changes in muscle fiber types

Muscle strength depends not only on the volume of the muscle but also on the type of muscle fiber. According to the contraction speed of muscles, the muscle fiber types of skeletal muscle can be divided into slow muscle, fast muscle a and fast muscle x, and the type of muscle fiber is closely related to the strength. The speed is also significantly higher than that of slow muscle fibers, but the fatigue resistance of slow muscle fibers is significantly stronger than that of fast muscle fibers. Therefore, athletes who want to increase muscle strength can maximize fast muscle fiber growth through systematic strength training and explosive training.

Nerve control ability

The strength of muscles is not entirely determined by the nature of the muscles. It also has a certain relationship with neural control. The ability of neural control can effectively regulate the recruitment of motor units in muscles. Research has confirmed that the neuromuscular system in the human body can effectively prevent muscle strength from exceeding the tolerance range of bones and related tissues, but strength training will gradually reduce or counteract the self-inhibitory response of this body, ensuring that muscles can produce larger muscles. force. And the experiment also found that nerve control ability is the main factor of increasing strength, and muscle hypertrophy is only a secondary influencing factor.


The endocrine system of the human body has a certain relationship with the strength, and the endocrine hormones that have a greater impact on muscle strength are growth hormone and testosterone. The nutritional effect of growth hormone on muscle strength can promote muscle protein synthesis, increase the volume of atrophic muscles, and improve muscle function. Testosterone can stimulate muscles to take up amino acids, which in turn promotes the growth of muscle fibers and has a positive effect on the increase in muscle volume. Studies have shown that resistance training can increase the release of growth hormone and testosterone, and after long-term training for men, the level of resting testosterone will also increase.

Summary: Although these six factors affect the strength of muscles, reasonable exercise will also change most of the factors. Therefore, before we reach our strength limit, we need to continue to work hard to maximize our muscle strength.

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