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BPK 375 > Metabolism and temperature > Flashcards

Metabolism and temperature Flashcards

1
Q

what contributes to the poor regulation of temperature in newborns

A
  • mechanisms for shivering/sweating are poorly developed
  • immature sweat glands
  • large SA/weight ratio
  • thin subcutaneous adipose tissue layer
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2
Q

how does body temperature and SD of temp change as we age; what does this mean

A
  • temp and SD decrease

- decreased SD = better regulation

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3
Q

how can babies regulate temperature if they are too cold

A
  • vasoconstriction of peripheral vessels to keep the core warm
  • Crying to increase metabolic rate therefore increasing body temperature
  • restlessness to increase movement and increase temp
  • brown adipose tissue; increase NST via UCP1
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4
Q

What factors leave adolescent athletes at risk for heat stroke

A
  • intense prolonged activity
  • high ambient temp/humidity
  • heavy equipment
  • small SA/weight ratio
  • lack of water
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5
Q

what steps lead to heat stroke

A
  • sweating hypotonic fluid
  • water leaves blood therefore decreasing blood vol and resulting in a high [ ] of electrolytes in the blood
  • excess water loss “turns off” sweating
  • temp then rises rapidly
  • heart failure
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6
Q

what is the respiratory quotient

A
  • VCO2 produced/VO2 consumed
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7
Q

how does RQ vary with fuel source

A
  • carbs: 1
  • fat: 0.7
  • protein: 0.8
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8
Q

how does RQ change within first week of life

A
  • starts high due to glycogen stores
  • drops due to fat in breast milk
  • then stabilizes around 0.8 due to mixture of fats and carbs
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9
Q

what are criteria for reaching VO2 max

A
  • heart rate above 190
  • subject says they’re at their max
  • VO2 plateaus
  • blood lactate levels
  • R > 1.1
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10
Q

What’s the reliability of VO2 max tests in kids?

A

low; 0.5-0.8

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11
Q

how does absolute and relative VO2 max coincide with PHV

A
  • Absolute: @ same time

- Relative: peak = before PHV

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12
Q

how does the physical work capacity test make up for low reliability of VO2 max testing

A
  • submax test, therefore better tolerated by kids
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13
Q

what is the formula for mechanical efficiency

A
  • work output/ (exercise MR/RMR)
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14
Q

What qualities should a fitness test possess

A
  • be able to measure all fitness levels
  • measure capacities which can be improved upon
  • should reflect an individuals physical fitness status and reflect changes
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15
Q

what are the 4 components of health based fitness

A
  • body composition
  • cardiorespiratory
  • flexibility
  • muscular strength endurance & power
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16
Q

what curve is the health-related fitness curve similar to

A
  • somatic growth
17
Q

what are the 5 components of skill related fitness

A
  • agility, speed, coordination, balance, reaction time
18
Q

what curve is the skill-related fitness curve similar to

A
  • neural growth
19
Q

what does a strength test measure

A
  • specific muscle strengths
20
Q

what does a jump test measure

A
  • body weight/composition
21
Q

what does a throwing test measure

A

skill

22
Q

define muscular strength

A
  • the force or tension a muscle can exert against resistance in one maximal effort
23
Q

define muscular endurance

A
  • capacity of a muscle to perform repeated contractions over extended period of time
24
Q

what’s the difference in anaerobic/aerobic power ratio in M vs F

A

F: greater ratio, but M have greater anaerobic and aerobic thus resulting in smaller ratio

25
Q

what are metabolic measures of anaerobic

A
  • Max O2 deficit
  • O2 debt
  • Blood lactate
26
Q

what are physical performance tests of anaerobic performance?

A
  • sprinting, step running, vertical jump
27
Q

differentiate peak power and anaerobic capacity

A
  • peak power: highest mechanical power generated by a muscle in 10 s
  • anaerobic capacity: ability to maintain high power over time

BPK 375 (6 decks)

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