Roger M. Enoka, PhD, is a professor in the department of integrative physiology at the University of Colorado–Boulder and a professor in the departments of medicine (geriatrics) and neurology at the University of Colorado’s Anschutz Medical Center. He is also the director of the Neurophysiology of Movement Lab. He was previously a biomechanist in the department of biomedical engineering at the Cleveland Clinic Foundation and a professor in the department of physiology at the University of Arizona.

Enoka has spent 50 years focusing his research and teaching on the combination of biomechanics and neurophysiology of movement. Internationally known for his achievements as a teacher and researcher, Enoka is the author of approximately 350 journal articles, books, chapters, reviews, and abstracts, including the frequently cited article “Neurobiology of Muscle Fatigue” published in the Journal of Applied Physiology. He is the recipient of numerous honors and awards, including an honorary doctorate (honoris causa) from the Université libre de Bruxelles in Brussels, Belgium (2023); the Borelli Award from the American Society of Biomechanics (2018); and the Basmajian Award from the International Society of Electrophysiology and Kinesiology (2018).

He is a member of the American College of Sports Medicine, American Physiological Society, and International Society of Biomechanics. He is also a past president and current member of the American Society of Biomechanics.

Part I. Biomechanics of Movement

Chapter 1. Describing Motion
Measurement Rules
Motion Descriptors
Constant Acceleration
Up and Down
Scalars and Vectors
Linear and Angular Motion
Wearable Devices
Summary
Suggested Readings

Chapter 2. Movement Forces
Laws of Motion
Describing Forces in Human Movement
Forces Due to Body Mass
Forces Due to the Surroundings
Musculoskeletal Forces
Summary
Suggested Readings

Chapter 3. Movement Analysis
Static Analysis
Dynamic Analysis
Momentum
Work
Summary
Suggested Readings

Chapter 4. Fundamental Movements
Walking and Running
Jumping
Throwing and Kicking
Cycling
Summary
Suggested Readings

Part II. The Motor System

Chapter 5. Excitable Membranes
Essentials of Electricity
Resting Membrane Potential
Neurons
Synaptic Transmission
Electromyography
Summary
Suggested Readings

Chapter 6. Muscle and Motor Units
Muscle
Excitation–Contraction Coupling
Motor Unit
Muscle Mechanics
Summary
Suggested Readings

Chapter 7. Neural Control of Movement
Spinal Reflexes
Automatic Behaviors
Voluntary Actions
Summary
Suggested Readings

Part III. Adaptability of the Motor System

Chapter 8. Acute Adjustments
Warm-Up Effects
Flexibility
Muscle Soreness and Damage
Fatigue
Neuromuscular Potentiation
Arousal
Summary
Suggested Readings

Chapter 9. Chronic Adaptations
Muscle Strength
Muscle Power
Neuromuscular Adaptations to Microgravity
Motor Recovery After Nervous System Injury
Adaptations in Older Adults
Summary
Suggested Readings

Appendix A. SI Units
Appendix B. Curve Fitting and Smoothing
Appendix C. Body Segment Properties
Appendix D. Range of Motion at the Major Joints of the Human Body