Hair is often a part of confidence and beauty. But not many people understand how hair actually grows. The process of hair growth is a fascinating cycle that occurs in four distinct stages: Anagen, Catagen, Telogen, and Exogen. In this blog, we will delve into each stage of the hair growth cycle, unravelling the mysteries of hair growth and shedding. Additionally, we will explore the impact of low-level laser therapy on the anagen and catagen stages, offering a promising solution for promoting healthy hair growth.
Stage 1: Anagen (Growth Phase)
The anagen stage is the active growth phase of the hair follicles. It typically lasts between two to seven years, depending on genetic factors and individual variation. During this phase, cells in the hair matrix rapidly divide, leading to the production of new hair fibres. The hair shaft elongates, resulting in visible growth. Approximately 85-90% of our scalp hair is in the anagen stage at any given time. The duration of this phase determines the potential length of our hair.
Stage 2: Catagen (Transition Phase)
The catagen stage signals a transition period between the active growth phase and the resting phase. This brief phase lasts for about two to three weeks. During catagen, the hair follicle shrinks, and the hair shaft is detached from the blood supply, which causes the hair to stop growing. The outer root sheath contracts, forming a club hair. Although hair growth ceases in this stage, the follicle remains intact, setting the stage for the next cycle.
Stage 3: Telogen (Resting Phase)
The telogen stage is a resting phase that lasts approximately two to four months. Around 10-15% of our scalp hair is in this stage. During telogen, the club hair remains dormant in the follicle while new hair begins to form beneath it. While the old hair is still attached, new hair starts growing and pushes it out. Shedding of the old hair occurs naturally during this stage, allowing space for new hair growth.
Stage 4: Exogen (Shedding Phase)
The exogen stage represents the shedding phase of the hair growth cycle. It is a natural process in which the old hair, known as the club hair, is shed to make room for new hair growth. Normally, 50-100 hairs are shed per day. The exogen phase typically coincides with the beginning of a new anagen phase, allowing the cycle to repeat.
Impact of Low-Level Laser Therapy on Anagen and Catagen Stages
Low-level laser therapy (LLLT) is a non-invasive treatment for promoting hair growth. Studies suggest that LLLT can have a positive impact on both the anagen and catagen stages of the hair growth cycle.
During the anagen stage, LLLT has been found to enhance cellular metabolism and increase blood flow to the hair follicles. This increased circulation delivers essential nutrients and oxygen to the follicles, promoting healthier and more robust hair growth. LLLT also extends the duration of the anagen phase, resulting in a longer hair growth cycles.
In the catagen stage, LLLT can help prolong the retention of hair follicles. By stimulating the follicles and improving their anchoring strength, LLLT reduces hair shedding and promotes a smoother transition from the catagen to the telogen phase. This contributes to a denser and fuller head of hair overall.
Numerous studies have demonstrated the effectiveness of low-level laser therapy in stimulating hair growth. The red or near-infrared light emitted during LLLT penetrates the scalp and is absorbed by the cells in the hair follicles. This absorption triggers a series of cellular responses, including increased ATP production, improved circulation, and the release of growth factors. These processes collectively promote hair follicle activity and ultimately lead to enhanced hair growth.
One of the significant advantages of LLLT is the non-invasiveness and lack of adverse side effects. Unlike certain medications or surgical interventions, LLLT does not disrupt the natural balance of the body or potentially expose individuals to any harmful substances. It is a safe and painless procedure that can be easily administered at home with handheld devices or in professional settings.
Wrapping Up
The anagen, catagen, telogen, and exogen stages collectively dictate the length, density, and overall health of our hair. Low-level laser therapy has emerged as a promising solution for promoting hair growth by stimulating follicular activity and extending the anagen phase while minimising shedding during the catagen phase. By incorporating LLLT into a comprehensive hair care routine, individuals can optimize their chances of achieving healthier, more vibrant hair.