Chapter_7_Notes_Part_2_strength_and_flexibility

Chapter_7_Notes_Part_2_strength_and_flexibility -...

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Click to edit Master subtitle style Physiological Changes: Health  Related Physical Fitness Chapter 7 Part 2 Strength and  Flexibility
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Maintaining an active lifestyle is  linked to good health
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Muscular Strength Minimal muscular strength is important for  human movement How much strength does a toddler need to  walk? How much strength does it take for an elderly  individual to get up from a chair?
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Defining and Measuring  Muscular Strength  strength is the ability to exert a muscular  force Static or isometric force – muscular force  exerted against a non-moveable object   dynamic force  – muscular force exerted  against a moveable object
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Defining and Measuring  Muscular Strength Laboratory test Grip strength Field tests  Pull up test ~ upper body strength/endurance Chin up test ~ upper arm strength/endurance Modified bent knee sit up test~ abdominal  strength/endurance
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Age-related Changes in Muscular Strength:  Laboratory Tests Grip strength test is a common test  among children Easy to administer Reliable Changes in strength are tied to changes in  body weight
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Age-related Changes in Muscular Strength:  Laboratory Tests In boys, the strength “spurt” lags a year behind  the height “spurt” Boys tend to outgrow their strength just prior to  puberty May explain why some boys experience a period of clumsiness Boys’ fastest increase in muscular strength  occurs 1 yr after peak height velocity
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Age-related Changes in Muscular Strength:  Laboratory Tests In girls, the strength spurt occurs during the same  year as peak height velocity In general, boys are 10% stronger than girls Gender differences are most apparent after puberty Total body strength in women is 63.5% of men Absolute upper-body strength in women is 50% less than  men Absolute lower-body strength in women is 20-30% lower  than men
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Age-related Changes in Muscular Strength:  Laboratory Tests Aging Between 25-50 yr there is a slow loss in muscle  mass of about 10% Between 50-80 yr there is an accelerated loss of 
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Chapter_7_Notes_Part_2_strength_and_flexibility -...

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