A combination physiologic status sensor system is described. It integrates a highly efficient reflectance oximeter, acquisition of a 2-lead electrocardiogram (“ECG”) heart rate signal, a photonic indicator of molecular products of anaerobic metabolism, and a skin temperature sensor. Placement of this motion tolerant sensor system may be on the adult or child subject's upper arm or infant chest, or chest and abdomen, for acquisition of high quality signals. Efficient use of battery power, combined optionally with wireless communications, enables continuous ambulatory use for extended periods of time. The comprehensive physiologic profile provided by this multi-factorial sensor and analysis system is anticipated to be of benefit in providing physiologically important, actionable information in a wide range of applications, including athletic training and performance, high risk occupational safety monitoring, and critical and convalescent medical care of patients of all ages and sizes.
