Hamstring Tightness and Lumbar Lordosis Angel Across Functional Sitting Posture.

The goal of this observational study is to learn about the relationship between hamstring tightness and the lumbar lordosis angle in sedentary adults across different sitting postures. The main question it aims to answer is: Is hamstring tightness related to the lumbar lordosis angle across three functional sitting postures (upright, slumped, and forward-leaning)? It also asks whether hamstring tightness differs between men and women, whether it differs between the dominant and non-dominant leg, and whether the lumbar lordosis angle differs between men and women across the three postures. Participants will have their hamstring tightness measured with the Active Knee Extension test and their lumbar lordosis angle measured with a bubble inclinometer while sitting in each of the three postures.

NCT Number	NCT07682142
Lead Sponsor	Cairo University
Conditions	Hamstring Tightness, Lumbar Lordosis, Sedentary Behavior, Posture Sitting Position
Enrollment	110 participants
Start Date	2026-08-01
Primary Completion	2026-10-01 (estimated)
Study Completion	2026-12-01 (estimated)
Updated on ClinicalTrials.gov	2026-07-06