Master this deck with 21 terms through effective study methods.
Generated from uploaded pdf
Etienne Jules Marey was a pioneer in the field of chronophotography, which he used to study human movement, particularly in walking and running, during the late 19th century. His work laid the foundation for understanding motor control and biomechanics.
Central rhythm generators are neural circuits in the spinal cord that produce rhythmic patterns of motor activity, essential for automatic and cyclic movements like walking. They coordinate the activation of different muscle groups in a specific order.
The primary muscle types are skeletal, cardiac, and smooth muscles. Skeletal muscles are striated and under voluntary control, cardiac muscles are striated and involuntary, found in the heart, and smooth muscles are non-striated and involuntary, found in organs.
During low-intensity exercise, muscles primarily use lipids for energy. As intensity increases, the reliance shifts to carbohydrates, particularly glucose and glycogen, with a significant contribution from anaerobic metabolism at high intensities.
Regular exercise training leads to adaptations such as increased stroke volume, improved cardiac output, enhanced capillary density, and better oxygen delivery to muscles, resulting in improved endurance and overall cardiovascular health.
The crossover point refers to the exercise intensity at which the body shifts from predominantly using fat as a fuel source to carbohydrates. This typically occurs around 35% of VO2max and is crucial for understanding energy metabolism during exercise.
Catecholamines, such as adrenaline, increase during exercise, enhancing heart contractility, metabolism, and glycogenolysis. Glucocorticoids, like cortisol, also rise, promoting gluconeogenesis and mobilizing fatty acids, which can help sustain energy during prolonged exercise.
Key components include the ischio-jambier, droit fémoral, vaste latéral, grand glutéal, gastrocnémien, soléaire, and tibial antérieur. These muscles work together to facilitate movement through contraction and relaxation during walking and running.
Sensory feedback is crucial for maintaining balance and coordination during walking. It provides information about body position and movement, allowing for adjustments in muscle activation and gait patterns to prevent falls and ensure efficient locomotion.
At rest, muscles primarily utilize lipids (60%), followed by carbohydrates (35%) and a small percentage from proteins (5%). This balance shifts during exercise based on intensity and duration.
During the initial phase of exercise, the body experiences increased heart rate, respiratory rate, and blood flow to active muscles. Hormonal responses also initiate, enhancing energy availability and metabolic processes.
Endurance training leads to increased mitochondrial density, enhanced oxidative capacity, improved fat oxidation, and greater glycogen storage, allowing for more efficient energy production during prolonged exercise.
ATP (adenosine triphosphate) is the primary energy currency of the cell, providing the energy required for muscle contraction. It is necessary for the cross-bridge cycle in muscle fibers, allowing for contraction and relaxation.
Prolonged exercise leads to a depletion of glycogen stores in muscles and the liver. As glycogen levels decrease, the body increasingly relies on fat oxidation for energy, which can affect performance and endurance.
Neuromuscular control is essential for coordinating muscle contractions and maintaining posture and balance during exercise. It involves the integration of sensory input and motor output to produce smooth and efficient movements.
Adaptations in the respiratory system, such as increased lung capacity, improved gas exchange efficiency, and enhanced ventilation, support exercise performance by ensuring adequate oxygen delivery and carbon dioxide removal during physical activity.
As exercise intensity increases, the body shifts from using fats to carbohydrates as the primary fuel source. This shift is due to the greater energy demands and the need for faster ATP production through anaerobic pathways.
Key factors influencing muscle fatigue include the depletion of energy substrates (like glycogen), accumulation of metabolic byproducts (such as lactic acid), dehydration, and electrolyte imbalances, all of which can impair muscle function.
The autonomic nervous system regulates involuntary physiological responses during exercise, including heart rate, blood pressure, and respiratory rate, through sympathetic activation (fight or flight) and parasympathetic withdrawal (rest and digest).
Recovery from exercise-induced stress involves physiological processes such as replenishing energy stores, repairing muscle tissue, restoring fluid and electrolyte balance, and reducing inflammation, which are essential for optimal performance in subsequent workouts.
Training leads to neuromuscular adaptations such as increased motor unit recruitment, improved synchronization of muscle fibers, and enhanced neural drive, which contribute to greater strength, power, and overall athletic performance.