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Fitness management 386 > Hydroweigh > Flashcards

Hydroweigh Flashcards

1
Q

underwater weighing procedure is based on what?

A

Archimede’s Principle

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2
Q

Archimede’s Principle

A

an obj buoyed up by a force equal to the weight of the water displaced, an object displaces its own volume in water

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3
Q

Based on AP how do we know weight

A

force buoyed up the object = weight of displaced h20

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4
Q

density of water

A

1 g/cc

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5
Q

how do you calc body density?

A

divide person weight in grams by their weight minus their weight in water

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6
Q

Body mass in air is measured to the nearest

A

1/quarter pound using a medical platform scale

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7
Q

Body weight is then converted to body mass assuming

A

2.2 lbs of body weight is = 1 kg of body mass

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8
Q

body mass in air is expressed in

A

grams

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9
Q

The subject will sit in a specially designed chair suspended in a stainless steel tank filled with

A

warm water after they have been removed from the suit and skin

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10
Q

What tool/device is used to insure total submersion of the subject ?

A

a weighted S.C.U.B.A. belt

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11
Q

First trial/ one trial consists of the subject forcefully exhaling as much air from lungs as possible, pulling what to do what

A

head to knees to fully submerse the entire body, and remaining still until a signal is received to return to the surface

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12
Q

Who issues signal and when?

A

The signal is issued by the technician performing the test when the total mass of the system has been determined to the nearest 50 grams using Chatillon autopsy scale.

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13
Q

What happens if there are fluctuations in the scale?

A

If fluctuations in the scale due to movement of the subject are encoutered, the midpt of the range of values observed is recored as the total mass in the water

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14
Q

How many trials are completed ?

A

5 or more depending on the consistency of the measurements

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15
Q

What values are used for body mass in water?

A

The mean of the two highest measures of body mass in water is used.

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16
Q

Body mass in water is expressed in?

A

grams

17
Q

The vital capacity (VC) is measured to the nearest

A

50 mL

18
Q

How is the subject positioned for Residual Lung volume (RV) test?

A

The subj is seated in a position similar to that assumed under the water.

19
Q

AIrflow through nose is prevent by

A

having the subj wearing a noseclip

20
Q

One trial of RV consists of the subject

A

inhaling maximally, placing the mouthpiece of the spirometer into the mouth, sealing the lips around the mouthpiece, and forcefully exhaling all air from the lungs

21
Q

How many trials?

A

3 to 5 trials are performed depending on the consistency of the measurements

22
Q

What is used from RV test to get VC?

A

The mean of the highest 2 volumes is used as VC

23
Q

RV is estimated by assuming it to be a

A

constant proportion of the measured vital capacity, and poprotions based on data from Wilmore, 1969.

24
Q

RV is expressed in

A

mL

25
Q

Male RVbtps=

A

(0.24xVCatps)10001.063

26
Q

Female RVbtps =

A

(0.28 x VC atps) * 1000*1.063

27
Q

Water density is measured in blank or blank

A

g/ml or g/cc

28
Q

Body density formulae equation of

A

goldman and buskirk 59

29
Q

DB =

A

MA/[MA-MW]/DW - RVbtps

30
Q

DB

A

body density (g/cc)

31
Q

MA

A

body mass in air (g)

32
Q

MW

A

body water in water (g)

33
Q

DW

A

Water Density (g/ml)

34
Q

RV

A

Residual lung volume in BTPS (ml)

35
Q

MW =

A

water weight- tare weight

36
Q

MA=

A

lbs/2.2 = kg *1000 = g

37
Q

%Fat = eqn for femalses

A

[(4.57/DB)-4.142]* 100

38
Q

Fat weight =

A

body weight * (%fat/100)

39
Q

Lean weight=

A

Body weight- fat wt

Fitness management 386 (6 decks)

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