Sports Biomechanics: Analyze & Optimize Athletic Performance

Explore the structure and function of bones and the skeleton, including epiphysis, diaphysis, cortical and spongy bone, articular cartilage, medullary cavity, and the mechanical role in force transfer.

Differentiate cortical and spongy bone, noting cortical bone’s density, stiffness, and edge location, and spongy bone’s light, stable network; identify long, flat, short, irregular, and sesamoid bone types.

Explore how Wolff's law drives bone adaptation to loading and why stress shielding weakens bone density with reduced load, implants, or osteoporosis. Apply progressive overload to strengthen bones safely.

Explore the anatomy and functioning of joints, from diarthrosis to the so-called sinatruces, and how articular cartilage and synovial fluid enable smooth, controlled movement.

Identify the three joint types: uniaxial, biaxial, and tri-axial, and note their degrees of freedom, with hinge and pivot for uniaxial, saddle/plane/condyloid for biaxial, and ball and socket for tri-axial.

Explore the knee joint anatomy, a biaxial modified hinge with femur-tibia and femur-patella joints, featuring rolling, sliding, and slight external rotation during extension, and the screw home mechanism.

Analyze how ligaments, made of collagen, reinforce joint capsules, limit motion, and store elastic energy in the foot arch, while tendons transfer muscle forces to bones, with aponeurosis linking muscles.

Explore how knee ligaments, including LCL, MCL, ACL, and PCL, regulate tibia-femur movement and provide stability, while muscles actively generate forces to control knee flexion and extension.

Explore the knee's meniscus, a c-shaped fibrocartilage that augments tibia head and the femur head contact and reduces stress by distributing pressure, while lacking a synovial membrane limits blood supply.

Explore the three muscle types—smooth, cardiac, and skeletal—and why skeletal training drives strength and power for sport, with insights into involuntary control, movement, and metabolism.

Explore the structure of skeletal muscle, including origin and insertion, monoarticular vs polyarticular muscles, agonist and antagonist roles, and the hierarchical organization from muscle to sarcomeres that enables force production.

Explore the sliding filament theory of muscle contraction, detailing sarcomere structures (actin, myosin, A and I bands, z-disc, m-line) and the cross-bridge cycle powered by ATP that causes filament sliding.

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Explore the force-length relationship of the sarcomere, where peak active force occurs at normal fiber length and longer fibers broaden the curve, increasing shortening velocity, with Titin adding passive force.

Explains slow twitch type 1 and fast twitch type 2 fibers, including subtypes 2A and 2X, their endurance, explosive capacity, genetic variation, and how fiber composition shapes athletic performance.

Explore the variety of muscle architectures, including unipennate, bipennate, multipennate, and parallel muscles, and learn how pennation angle and physiological cross-sectional area influence force, shortening velocity, and the force-length relationship.

Explore isometric, concentric, and eccentric contractions, including yielding and overcoming isometrics, and see how these forms drive explosive movements, training adaptations, and soreness in sport.

Understand how muscle force depends on contraction velocity and the force-velocity curve. Generate more force during eccentric movements while watching injury risk at high lengthening velocities.

Explore the stretch shortening cycle's role in plyometrics, comparing countermovement and squat jumps while highlighting pre-activation, tendon energy transfer, and fast and slow stretch reflexes for maximal velocity and power.

Explain cocontraction as the activation of agonist and antagonist around a joint to stabilize movement, with on-off switching before ground contact at 50 ms for pre-activation and injury risk reduction.

Explore muscle hypertrophy, the enlargement of muscle cells from resistance training, including myofibrillar and sarcoplasmic forms. Identify metabolic stress, mechanical tension, and muscle damage, and the 6–15 rep range.

Explore jumping diagnostics to assess leg extensor performance and jump ability, with squat, countermovement, and drop jump tests, and measure jump height via impulse, integration, or time of flight methods.

Assess concentric rate of force development and lower-extremity power with the squat jump test, starting from a squat, to gauge jump height, ground push-off time, and center-of-mass power.

Use countermovement jump test to measure eccentric-concentric power and the stretch-shortening cycle. Compare with squat jump, interpret jump height, force-time curve, ground reaction forces, and initial force.

Explore how the drop jump test assesses eccentric–concentric power and reactive strength, using ground contact time and ground reaction forces to compute the reactive strength index.

Use the impulse method to estimate jump height from ground reaction force with force plates. Compute takeoff velocity from the force-time integrals of A1, A2, and A3 to derive height.

Apply the integration method to compute jump height by integrating acceleration to velocity and velocity to distance, assuming zero initial velocity and constant acceleration, noting its lower accuracy.

Use the time-of-flight method to determine jump height with a video camera. Measure air time from takeoff to landing, then compute height using g t^2 / 8.

Examine the initial sprint phase: triple extension of the push-off leg, triple flexion of the swing leg, and a low shin angle to maximize horizontal velocity and minimize reaction time.

The acceleration phase starts when foot leaves the block and the swing leg lands. Maintain a low shin angle and horizontal ground reaction forces early; shift to vertical forces later.

During the maximal velocity phase, maintain upright posture with high knee lift and midfoot or toe strike under the body, keep short ground contact, generate maximal vertical force, and preserve horizontal momentum.

Explore force generating components in sprinting—hip with glutes, knee with quadriceps, ankle with gastrocnemius—and how amputee sprinters with prostheses store energy yet experience reduced push-off and slower acceleration.

Sprinters store and release elastic energy in non-contractile elements like tendons and ligaments, acting as springs to maintain maximal velocity, with sprint prostheses sometimes outperforming biological legs in this phase.

Discover how sprint shoes influence performance, from spike models with high bending stiffness and carbon fiber midsoles to lightweight designs that store and release elastic energy, reducing ground contact time.

Define the biomechanical principles and explain how physical, mechanical, and anatomical properties shape movement, break down complex sports actions into simple components, and introduce Hochmuth’s six principles.

Explore the principle of the optimal acceleration path, where technique, not maximal acceleration, yields higher terminal velocity and force production in throwing movements like shot put.

Understand how a velocity-time curve shows constant acceleration producing rising velocity, and how a longer acceleration path raises terminal velocity, guiding the optimal—not maximal—acceleration in biomechanics and movement.

Apply the principle of the optimal tendency in the acceleration curve to maximize force in the shortest possible time for sprint starts and to maximize terminal velocity in throwing disciplines.

Apply the initial force principle by using a counter movement to boost takeoff force, then optimize rather than maximize this force through technique and muscle-tendon interaction for better performance.

Explore the principle of temporal coordination of individual impulses and how whole-body momentum depends on the optimal timing and spatial coordination of muscle subsystems, shaping technique and jump height.

Analyze how counteraction and rotational recoil stem from Newton's third law, how reaction forces stabilize landings and jumps, and how angular momentum is adjusted in the air.

Identify the momentum conservation principle, where bringing body parts closer to the rotation axis increases angular velocity by reducing inertia. This is demonstrated by flips and a spinning ballerina.

Explore motion tracking and motion analysis to optimize human movement, reduce energy expenditure, and lower costs in training and rehabilitation.

Discover how inertial measurement units (IMUs) with accelerometers, gyroscopes, and magnetometers measure accelerations, angular velocities, and orientation to analyze human movement, assess athletic performance, and manage joint load in sports.

Force plates measure ground reaction forces and moments to assess power and vertical jump, while pressure plates map plantar pressure to guide personalized insoles for orthopedic care.

Use two dimensional motion analysis to track sagittal plane movements with a portable and cheap camera and software, calibrating parallel to the plane to estimate joint angles and shooting arc.

Explore three dimensional motion analysis, contrasting marker based systems—the gold standard with markers and multiple cameras—with emerging markerless methods for field analysis and training optimization.

Explore data analysis in biomechanics, bridging coaches, doctors, and data scientists through machine learning, algorithms, and models to optimize human movement using IMUs and wearables.

Thank you for completing this course; explore the bonus section on training surfaces and the effect of shoes on training, athletic performance, and biomechanics, and consider other courses on biomechanics.

Explore how midsole stiffness, thickness, and carbon fiber design influence energy storage, landing forces, and injury risk, while 3D-printed heel cups and uppers shape plantar pressure and performance.

Match surface stiffness to training goals. Gradually build tolerance to harder surfaces like cement, while grass, tartan, or wood support jump and explosive training and preserve muscle tendon interaction.

Training in sand yields muscular benefits, high energy demands, ankle involvement, and low impact options. However, sand's dissipation limits tendon interaction, limiting speed, acceleration, deceleration, and change of direction.

Explore barefoot training to strengthen the foot complex, improve cushioning for landings, and reduce injury risk by training with minimal heel elevation and progressive barefoot exercises.

Leverage trampoline training to boost motivation and fun, while improving lymph circulation and metabolic conditioning. Build muscular strength, core stability, and coordination through progressive, low-impact jumps.