Fascia is the continuous network of connective tissue that envelops and connects every muscle, bone, nerve, blood vessel, and organ in the body. For most of the twentieth century, it was regarded by anatomists as the background tissue: the stuff you remove to see the interesting structures underneath. This view has been radically revised over the past two decades by research revealing that fascia is richly innervated with mechanoreceptors, proprioceptors, and nociceptors, making it a significant contributor to proprioception, movement quality, and pain generation.
The Fascial Continuity Model
Rather than individual muscles contracting independently to produce movement, the fascial research suggests that forces are transmitted through continuous myofascial chains that connect anatomically distant structures. The posterior superficial chain connects the plantar fascia of the foot through the calf, hamstring, thoracolumbar fascia, and erector spinae to the base of the skull. Restriction anywhere in this chain can produce symptoms at any other point. Hamstring tightness may originate in the thoracolumbar fascia. Neck pain may be maintained by fascial tension originating in the calf. This is not speculative: it is demonstrable in cadaveric models and supported by clinical presentations in manual therapy practice.
Hydration and Fascial Function
Fascia contains significant quantities of hyaluronic acid, a glycosaminoglycan that attracts water and provides the ground substance that allows fascial layers to slide over each other. Dehydration reduces hyaluronic acid fluidity, increasing friction between fascial layers and producing the stiffness and reduced range of motion associated with morning tightness and prolonged static posture. Robert Schleip's research group at Ulm University has demonstrated that fascial layers slide several millimetres during movement under well-hydrated conditions, and that this sliding becomes restricted with dehydration and age.
Fascial Training Approaches
The training approaches with the most evidence for improving fascial health include elasticity training involving plyometric and spring-like movements that rehydrate and remodel fascial tissue through fluid pumping. Yoga and stretching maintain the extensibility and sliding properties of fascial layers. Foam rolling and self-myofascial release have evidence for acutely improving range of motion through neural inhibition of the myofascial system rather than structural tissue change, but regular application may produce more durable benefits over time.
- Include elastic, spring-like movements such as skipping, bounding, or light plyometrics to maintain fascial recoil capacity
- Maintain hydration to support hyaluronic acid ground substance fluidity: fascial stiffness responds quickly to improved hydration
- Vary the angles and positions you stretch in: fascia adapts directionally and requires multi-directional loading
- Foam roll slowly, two to three centimetres per second, pausing on tender areas for 20 to 30 seconds
- Avoid prolonged static postures: fascial layers lose their sliding properties when compressed in the same position for extended periods
Sources
- Schleip, R., & Muller, D.G. (2013). Training principles for fascial connective tissues: scientific foundation and suggested practical applications. Journal of Bodywork and Movement Therapies, 17(1), 103-115.
- Stecco, C., et al. (2011). Hyaluronan within fascia in the etiology of myofascial pain. Surgical and Radiologic Anatomy, 33(10), 891-896.