Why you feel stiffer than yesterday

The Science of Delayed Soreness

That familiar ache arriving 24 to 48 hours after a new exercise session is known as Delayed Onset Muscle Soreness, or DOMS. Contrary to old beliefs, it is not caused by a buildup of lactic acid, which actually clears quite quickly after activity. Instead, it is the result of microscopic structural shifts within the muscle fibres and the surrounding connective tissue. When we challenge our bodies with new movements or increased intensity, we create tiny disruptions that trigger a necessary inflammatory response. This is the foundation of growth, but it requires a delicate balance of rest and support to ensure the tissue heals stronger than before.

The Role of Inflammation and Repair

When these micro-tears occur, the body initiates a cascade of chemical signals to attract immune cells to the area. This process helps clear away cellular debris and begins the synthesis of new proteins. While this can feel uncomfortable, it is a vital part of the adaptation process. The discomfort often peaks when the inflammatory markers are at their highest. During this window, the body is particularly sensitive to its internal environment. Ensuring you have the right building blocks, such as adequate amino acids and cellular cofactors, can help this transition feel smoother.

Moving Through the Ache

It is a common instinct to remain completely sedentary when soreness sets in, but 'active recovery' is often the most effective path forward. Gentle movement increases blood flow to the affected tissues, delivering oxygen and nutrients while encouraging the lymphatic system to flush out metabolic byproducts. Light walking, swimming, or restorative yoga can significantly shorten the duration of stiffness. The goal is not to push through pain, but to encourage the body’s natural circulation. If you are looking to support your body’s internal repair mechanisms, your clinician can advise whether an NAD+ injection pen is suitable for your specific recovery needs.

Long-term Resilience and Recovery

As we age, our body’s ability to bounce back from these micro-strains can shift. The efficiency of cellular repair may slow, making the recovery period feel longer or more taxing. This makes the 'pre-covery' phase—what you do before and during your workout—just as important as the rest period. Staying hydrated, prioritizing sleep, and maintaining a consistent movement practice helps keep the tissues supple and the repair pathways primed. By listening to these signals of soreness rather than ignoring them, you build a sustainable foundation for lifelong movement.