Currently, there is no system in place to allow manual wheelchair users to know their quantities of movement activities and the intensity of effort to be provided during these propulsion movements. Based on recent work by Routhier et al. in 2017, and in light of the scientific literature related to wheelchair propulsion, it would seem appropriate to validate the use of inertial units as tools to quantify and categorize the intensity of manual wheelchair propulsion.

The investigator hypothesize that an inertial unit positioned on the wheelchair wheel has the same detection rate of the propulsion cycle as a dynamometric wheel (step 1). In addition, the investigator hypothesize that the categorization of the detected propulsion cycle as a function of force intensity is similar between the angular deceleration of the wheel during propulsion calculated from the inertial unit and the external mechanical power calculated from a dynamometric wheel (step 2).

Inclusion Criteria:

For the healthy user group volunteers:

• Men or women over 18 years of age,
• An experience of at least 2 hours using the manual wheelchair,
• Subject who has signed an informed and written consent,
• Affiliation to a social security system.

For the spinal cord injured user group:

• Men or women over 18 years of age,
• Injured Medullary users of manually propelled wheelchairs for daily locomotion (at least 30/100 at WST on travel items),
• Subject who has signed an informed and written consent,
• Affiliation to a social security system.

Exclusion Criteria:

• Patient refusing to participate in the study,
• Manual wheelchair users with propulsion assistance system,
• Major cognitive disorders,
• Unbalanced cardiovascular disease,
• Pressure sores and unhealed palm lesions,
• Asthma to effort,
• Progressive etiologies: tumor, infectious, inflammatory and associated - - pathologies: head trauma, amputation,
• Patient under guardianship or curatorship,
• Pregnant or breastfeeding woman.

Manuel wheelchair users