Continuous Activity Monitoring During Fractionated Radiotherapy in Patients With Head and Neck, Lung, or Gastrointestinal Cancer

PRIMARY OBJECTIVES: I. To demonstrate the feasibility of continuous, accelerometer-based evaluation of patient activity levels before, during, and after treatment with fractionated external beam radiotherapy. SECONDARY OBJECTIVES: I. To demonstrate the feasibility of performing weekly quality of life assessments during fractionated external beam radiotherapy. II. To explore how accelerometer-based metrics change throughout patients' treatment courses and if these changes are associated with quality of life assessments, treatment interruptions, hospitalizations, and clinical outcomes. OUTLINE: Patients wear an activity monitor throughout and up 4 weeks after completion of radiation therapy. Patients who are willing may continue to wear the monitor through routine follow up appointments. Patients also complete questionnaires at evaluations, which take place prior to radiotherapy initiation, weekly during radiotherapy, and then 2 and 4 weeks after the completion of radiotherapy.