What happens to muscle size after 4-6 weeks of resistance training?

In the context of resistance training, muscle size typically begins to increase noticeably as the body adapts to the training stimulus. This initial phase of muscle growth can often be seen after about 4 to 6 weeks of consistent resistance training. The early adaptations primarily involve neural changes, such as improved coordination and activation of motor units, which can enhance strength before significant muscle hypertrophy occurs.

While the answer provided suggests that muscle size begins to contribute more—implying an improvement in overall functionality—the most accurate understanding is that muscle size increases sharply during this early phase of training due to various factors, including an increase in muscle fiber cross-sectional area and temporary increases in water content within the muscles.

Understanding that 4 to 6 weeks is generally a critical period for observable hypertrophy is key. Individuals often see improvements in strength and muscle definition, as the body responds to the overload stimulus presented by resistance training by adapting through muscle growth and neural efficiency. This aligns with the physiological principles of resistance training and muscle adaptation, marking the early stages of muscle hypertrophy as a significant aspect of the training response.