The ADAPT-study: Measuring Physical Performance Using Wearable Sensors in Parkinson's Disease and COPD (ADAPT)

Inclusion Criteria: * Participant is able to read and understand Dutch * Participant is willing, competent, and able to comply with all aspects of the protocol, including follow-up schedule * Participant is willing and able to complete patient-reported questionnaires via internet * Participant can walk * (PD-specific) Hoehn and Yahr 1-2 * (COPD-specific) Participant has COPD irrespective of airway obstruction severity and has a limited exercise capacity as judged by the physiotherapist Exclusion Criteria: * Participant is allergic to nickel * Participant cannot make an arm swing or is in a situation that prevents arm swing completely * Co-occurence of COPD and PD * Participant has cognitive impairment that would prevent understanding and performing tasks in the study * Participant is pregnant or plans to become pregnant during the course of the study * Participant is participating in another investigational drug or device study * Participant has a high fall risk or cardiovascular risk profile * Participant has any disease or condition that prevents understanding or communication of informed consent, study demands, and testing protocols