Chapter 7 Shit Flashcards
What is growth in the s+c world?
Increase in body size or particular body part
What is development for an athlete?
Natural progression from prenatal life to adulthood
What is maturation?
Process of becoming mature and fully-functional
What is chronological age?
-Age in months or years
-Not very accurate to define stages of development because children don’t grow at a constant rate
-Substantial differences in development occur between children of the same age
+Weight and height
+Physical skills and builds
+Differences in timing tempo and magnitude of growth during puberty - the period of time in which secondary sex characteristics develop and a child transitions to young adulthood
What is biological age?
-Measured in terms of skeletal age, physique maturity, or sexual maturation
-In women - menarche - the onset of menstruation - is the marker for sexual maturation
-In boys, sexual maturity indicated by:
+Appearance of pubic and facial hair
+Deepening of the voice
How is the assessment of maturation used in training children?
-Helps fairly match children for fitness testing and athletic competition
-No evidence that physical training delays or accelerates growth in adequately nourished children
-Osteogenic stimuli essential for skeletal remodeling and growth
What’s the best way to determine biological age?
Skeletal X-rays compared against standard reference radiographs
What is somatic age?
-Longitudinal growth curve analysis
-Prediction of age from peak height velocity - age of maximal growth during a puberty growth spurt
-Best assessed every three months for longitudinal assessments
What is training age?
Length of time a child has consistently followed a formalized and supervised resistance training program
How does training age affect growth in a given child?
-Magnitude of gain will be affected by the amount of adaptation that has already occurred
-Peak height velocity typically occurs between age 12 and 14 and may increase risk of injury 0 care must be taken to avoid overuse injuries and ensure proper lifting technique:
+Reinforce proper movement patterns
+Target flexibility restrictions and correct muscle imbalances
+Decrease volume and/or intensity
How is does muscle grow in youth populations?
-Muscle mass increases steadily throughout developing years
-At birth ~25% of body weight is muscle
-By adulthood ~40% body weight is muscle
-In male puberty - hormonal increases (testosterone, GH, IGF) results in large increase in muscle mass and shoulder-width
-In female puberty - increased estrogen leads to increased body fat, breast development, and hip width
-Muscle mass increase in boys greater than in girls
-Muscle mass increases are caused by hypertrophy of individual fibers
Where does the majority of bone formation occur?
-Diaphysis - central shaft of a long bone
-Growth cartilage - located in:
+Epiphyseal growth plate
+Joint surface
+Apophyseal insertions of muscle-tendon units
-Most bones are fused by early 20s
What is cartilage vulnerable to?
-injury from trauma and overuse
-Injuries may disrupt blood and nutrient supply
+Results in permanent growth disturbances
-Trauma can occur from falls or repetitive stress
Peak incidence of epiphyseal growth damage occurs at peak height velocity
-Pre-adolescents may be less susceptible to this type of injury before they hit peak height velocity
Injury risk can be lowered by
+The appropriate technique, progression, training loads, and qualified instruction by strength and conditioning professionals
What is cartilage vulnerable to?
-injury from trauma and overuse
-Injuries may disrupt blood and nutrient supply
+Results in permanent growth disturbances
-Trauma can occur from falls or repetitive stress
Peak incidence of epiphyseal growth damage occurs at peak height velocity
-Pre-adolescents may be less susceptible to this type of injury before they hit peak height velocity
Injury risk can be lowered by
+The appropriate technique, progression, training loads, and qualified instruction by strength and conditioning professionals
What developmental changes occur in muscular strength?
-Increases in strength correspond to increased muscle mass throughout adolescence
-In boys - peak strength gains typically appear 1.2 years after peak height velocity and .8 years after peak weight velocity
-Suggest muscle mass increase precedes the ability to express strength with the new muscle
-Similar for girls but more variation in the strength-weight relationship
-Hormonal responses account for the acceleration of strength in boys during puberty and plateau in strength in girls
-Myelination of motor neurons required for skilled performance
+Full myelination does not occur until sexual maturation
+Results in different responses and skill gains between children and adults