Functional model · SBNFA™

Prolonged sitting intolerance

In the SBNFA™ framework, prolonged sitting intolerance refers to a reduction in how long a person can stay seated before discomfort, pain, numbness, fatigue or a need to change position appears or worsens.

Scientific basis

How long a person can stay seated is used as a functional criterion in assessing several types of pain: low back pain, tailbone pain (coccydynia), and pelvic and perineal pain. For pudendal neuralgia, pain made worse by sitting is one of the Nantes diagnostic criteria, without being a sufficient criterion on its own (Labat et al. 2008).

Prolonged sitting intolerance is not a recognized diagnostic entity: it describes a functional situation shared by different conditions.

Blue Portance / SBNFA™ reading

Prolonged sitting intolerance is a descriptive functional term, classified as an SBNFA™ functional model based on separately documented mechanisms. It describes a functional situation; it does not designate a disease, a diagnosis or a single cause.

When symptoms are mainly pelvic, several situations may be involved: pudendal neuralgia, coccydynia, endometriosis, pelvic floor disorders, neuropathic pain, chronic pain and, where relevant, central sensitization. They do not form a single syndrome, and each calls for medical evaluation.

Contribution to the analysis of sitting

Seating analysis describes the conditions under which sitting is or is not tolerated: pelvic orientation, distribution and duration of support, and the ability to change position. It cannot identify the cause of an intolerance.

Not to be confused with

Pain when sitting, an occasional symptom that does not imply a lasting reduction in tolerance; Coccydynia, pain in the coccygeal region; Pudendal neuralgia, pain in the territory of the pudendal nerve; Neuropathic pain, pain caused by a lesion or disease of the somatosensory nervous system; Nerve mechanical tolerance, a model centered on the nerve and its environment.

Sources and scope

Labat et al. (2008): diagnostic criteria for pudendal neuralgia due to pudendal nerve involvement, the Nantes criteria (Neurourology and Urodynamics)

Descriptive, non-diagnostic term, not validated as a clinical entity. “Sitting-dependent pelvic syndrome” is not a clinical entity; sitting intolerance is not a disease, has no single cause, and no seat “cures” it.