7.2.2. Change in Body Shape

Have you noticed that boys in your class have broader shoulders and wider chests than boys in junior classes? This is because they have entered the age of puberty when shoulders generally broaden as a result of growth. In girls, the region below the waist becomes wider.

During puberty, boys and girls experience significant changes in their body shape. For boys, one of the most visible changes is the broadening of the shoulders and chest due to muscle development. This change signifies the onset of puberty when male hormones contribute to the growth of muscle mass. In contrast, girls tend to experience a widening of the hips and an increase in fat deposition in the body, particularly below the waist, which prepares them for potential future pregnancies.

Think of how a young sapling grows into a robust tree. Just as the tree needs certain conditions to grow broader and stronger, boys and girls experience specific changes during puberty that help shape their bodies. Like a tree spreading its branches, boys gain muscle and broaden their shoulders, while girls develop curves that allow for future reproductive capabilities.

In boys, the muscles of the body grow more prominently than in the girls. Thus, changes occurring in adolescent boys and girls are different.

Boys typically experience a more noticeable increase in muscle mass during puberty compared to girls, who may not develop muscle to the same extent. This difference is driven by the effects of male hormones such as testosterone. Muscles in boys become more defined and robust, contributing to their strength and physical abilities during these formative years. This growth can sometimes lead to boys developing a more athletic physique, while girls may focus more on developing their body shape through growth in other areas.

Imagine a sports team where boys and girls are preparing for a competition. Boys may undertake strength training to build muscles, resulting in stronger arms and legs. Meanwhile, the girls might focus on flexibility and agility, leading to different physical outcomes. This illustrates how hormonal influences can lead to variations in physical changes between genders during adolescence.

Did you notice that sometimes the voice of some of the boys in your class cracks? At puberty, the voice box or the larynx begins to grow. Boys develop larger voice boxes.

As boys enter puberty, their larynx grows and changes shape, which causes alterations in voice. When the larynx enlarges, it can lead to a deeper voice, but the shift is not smooth for all boys. Initially, their voices may crack or break as the vocal cords adjust to the changed structure of their voice box. These transformations signify the biological changes associated with male puberty.

Think of a musical instrument like a guitar. As you tighten the strings, the pitch changes. Similarly, as boys grow, their vocal cords adjust and it may lead to moments where their voices crack, almost as if they are still tuning their instrument until it achieves its full, deeper tone.

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