Human Physiology

Thermoregulation Altitude Physiology Altitude Effects Environmental Physiology Respiratory System Sleep Science Gastroenterology Space Missions Muscle Degeneration Adaptation Mechanisms Bone Density Muscle Repair Circulatory System Stomach Function Cerebral Blood Flow Survival Mechanisms Sex Differences Muscle Regeneration Effects of Microgravity Effects of Altitude Body Responses to Environment Metabolism Cardiac Function Muscle Anatomy Sensory Perception Physical Endurance Effects of Pressure Oxygen Levels Altitude Training Hypoxia Biomechanics High-Altitude Physiology Fatigue Research Aging Effects Brain Tissue Sports Science Body Functions

Kilian Jornet Completes Monthlong, Human-Powered Linkup of 72 U.S. Fourteeners

The ultrarunner relied on human power to test limits within routes open to the public.

Andrzej Bargiel Completes First No‑Oxygen Ski Descent of Mount Everest

Surveys Reveal Men Largely Unaware of Their Osteoporosis Risk