Evaluation of the Role of Connected Scales in the Therapeutic Care of Hematology Patients

Inclusion Criteria: * Patient aged 18 and over (male or female) * Patient suffering from aggressive non-Hodgkin's lymphoma or multiple myeloma with a plan for systemic chemotherapy or having started two cycles or less or patient with the need for therapeutic intensification under the cover of autograft in the context of myeloma or lymphoma * Patient who can be contacted by telephone during their participation in the research * Patient able to return home at the end of their initial hospitalization * Patient affiliated to social security * Patient able to read and speak French * Patient having signed free, informed and written consent Exclusion Criteria: * Patient with an estimated life expectancy \< 3 months * Patient with moderate to severe cognitive impairment (assessed by MMSE \< 20) * Patient with a psychiatric or physical disability that does not allow the use of the device * Patient with a pacemaker * Patient participating in another intervention research project * Pregnant patient * Patient deprived of liberty * Patient under legal protection (guardianship or curatorship)