Relationship between the locomotive syndrome and kinetic and kinematic parameters during static standing and level walking

Individuals experiencing age-related decline in locomotor functions are at high-risk of developing locomotive syndrome (LS). LS requires long-term care and greatly influences the quality of life and activities of daily living. The LS risk test was established as a diagnostic criterion by the Japanese Orthopedic Association. Although the relationship between the test and motor function has been established, few studies have reported on the characteristics of LS kinematically and kinetically. Do elderly with LS show different kinetic and kinematic characteristics compared with healthy elderly during static standing and level walking? Forty-four Participants were divided into an LS group and a non-LS group based on the scores of the LS risk test. The standing posture and walking of the participants were measured using a three-dimensional motion capture system. The results of the groups were compared using an unpaired t-test, and then the characteristics of the LS group were extracted using logistic regression analysis. LS group exhibited trunk flexion during both standing and gait. A higher intervertebral disc compressive force, which is the index of the low-back mechanical stress, during standing and an increase in ankle plantarflexion angle during walking were observed in LS group. This study determined the kinematic and kinetic features of elderly with LS. The findings suggest that parameters related to the trunk and ankle could be associated with LS. Further studying the characteristics of LS in older adults via motion analysis can help develop prevention and intervention methods for LS. •3D measurements of the standing posture and walking in the elderly were conducted.•Participants were divided into a Locomotive syndrome (LS) group and a non-LS group.•An intervertebral disc compressive force during standing increased in LS group.•An increase in ankle plantarflexion angle during walking were observed in LS group