9.metab

9.metab - Metabolism and energy homeostasis 1 Metabolism...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Metabolism and energy homeostasis Human Kinetics 191 1)Metabolism and metabolic rates 2)Energy balance 3)ATP: production and use 4)Fuel use during exercise
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Metabolism and energy homeostasis Human Kinetics 191 Metabolism •physiological chemical reactions anabolism b growth, increased complexity e.g . anabolic steroids - androstenedione catabolism b degradation, decreased complexity e.g. catabolic steroids - cortisol
Background image of page 2
Metabolism and energy homeostasis Human Kinetics 191 Basal (resting) metabolic rate (BMR) • energy required to maintain a resting, fasted, recovered adult • human BMR ~ 1200 - 1800 Cal/day • 24 Cal/kg body mass males • 22 Cal/kg body mass females •measured in units of “heat”: 1 Cal (1 kcal) will heat 1 liter H 2 O 1 o C = 240 C alories (240,000 calories)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Metabolism and energy homeostasis Human Kinetics 191 Basal (resting) metabolic rate (BMR) M etabolic E quivalen T s (METs) = resting rate of O 2 consumption • varies between people: standard value ~ 3.5 ml O 2 /min/kg • use to estimate VO 2rest (resting O 2 consumption) e.g. a 80 kg person has a VO 2rest = 3.5 x 80 = 280 ml O 2 /kg •can be used to compare exercise O 2 requirements e.g . running on a treadmill at 5 METs = 1400 ml O 2 /kg •severe “exhausting” exercise > 12 METs . (from Fox et al, Physiological Basis for Exercise, 1993) .
Background image of page 4
Metabolism and energy homeostasis Human Kinetics 191 Basal (resting) metabolic rate (BMR) energy required for sustained maintenance of life •automatic muscle function ( e.g. heart, diaphragm) •neural transmission, automatic functions, higher level cognition • routine cell replication/repair/replacement ( e.g. hair, RBCs, epithelium) • maintaining ion balance and eliminating wastes ( e.g. renal function) • maintaining cell membrane integrity • maintaining thermal homeostasis (in homeotherms)
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Metabolism and energy homeostasis Human Kinetics 191 Factors that affect metabolic rate 1) weight 2) exercise 3) hormones/neural input 4) body temperature 5) caloric intake and digestion 6) age
Background image of page 6
Metabolism and energy homeostasis Human Kinetics 191 1) Metabolic rate increases with weight BMR Body weight Durnin, 1981 Factors that affect metabolic rate
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Metabolism and energy homeostasis Human Kinetics 191 1) Metabolic rate increases with weight • metabolic rate = energy/time •mass specific metabolic rate = energy/time/mass Factors that affect metabolic rate
Background image of page 8
Metabolism and energy homeostasis Human Kinetics 191 0.01 kg mass of animal 1000 kg metabolic rate (ml O 2 /hr) mass specific metabolic rate ml (O 2 /hr /g) 0 from Eckert (1997) Animal Physiology shrew elephant O 2 use
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Metabolism and energy homeostasis Human Kinetics 191 2) Metabolic rate increases with exercise at rest : 1.25 Cal/min light work: 1.3 - 4.0 Cal/min moderate work: 4.0 - 7.5 Cal/min strenuous work: 7.5 - 12.5 Cal/min maximal work: 12.5 - 15.0 Cal/min exhausting work: >15.0 Cal/min (from Fox et al, 1993 The physiological Basis of Exercise and Sport) Factors that affect metabolic rate 12 fold range
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 41

9.metab - Metabolism and energy homeostasis 1 Metabolism...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online