Pulmonary Ventilation as an Index of Energy Expenditure

Durnin, J. V. G. A.; Edwards, Richard

doi:10.1113/expphysiol.1955.sp001137

Cited by 49 publications

(29 citation statements)

References 9 publications

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“…It is important to note that, above the anaerobic threshold (Th an ), _ V E increased disproportionately to _ VO 2 (1) as a consequence of the additional carbon dioxide generated from the buffering of lactic acid by bicarbonate ions (Wasserman et al 1967), (2) because of the progressive increase in respiratory muscle oxygen cost rises disproportionately with increasing hyperpnea (Aaron et al 1992). In our study, the range of _ V E studied is less than 50 l min -1 , and corresponds to light and moderate exercise where the _ VO 2 of any one individual is directly proportional to his _ V E (Durnin and Edwards 1955). Likewise, we are aware that, our study has been performed in young subjects and that the ventilatory response varies with aging, because of (1) the changes in the elastic properties of the respiratory system with age (Gibson et al 1976;Turner et al 1968) and (2) the decrease in the compliance of the respiratory system with age (Mittman et al 1965).…”

Section: Discussionmentioning

confidence: 94%

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Estimates of ventilation from measurements of rib cage and abdominal distances: a portable device

Gastinger

Sefati²,

Nicolas

et al. 2010

Eur J Appl Physiol

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To validate a new device designed to measure ventilation (V(E)), tidal volume (V(T)), inspiratory time (T(I)), and expiratory time (T(E)) during daily life activities. The anteroposterior displacement of the rib cage and abdomen and the axial displacements of the chest wall and the spine were measured using two pairs of magnetometers. was estimated from these four signals, and was simultaneously measured using a spirometer. A total of 707, 732, and 1,138 breaths were analyzed in sitting, standing, and exercise conditions, respectively. We compared V(E), V(T), T(I), and, T(E) measured by magnetometers (V(E)mag, V(T)mag, T(I)mag, and T(E)mag) with V(E), V(T), T(I), and T(E) measured by a spirometer V(E)spiro, V(T)spiro, T(I)spiro, and T(E)spiro, respectively). For pooled data V(E)mag, V(T)mag, T(I)mag, and T(E)mag were significantly correlated (p < 0.001) with V(E)spiro, V(T)spiro, T(I)spiro, and T(E)spiro in sitting and standing positions and during the walking exercise. The mean differences, between V(E)mag, and V(E)spiro for the group, were 10.44, 10.74, and 12.06% in sitting, standing, and exercise conditions, respectively. These results demonstrate the capacity of this new device to measure V(E) with reasonable accuracy in sitting, standing, and exercise conditions.

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Section: Discussionmentioning

confidence: 94%

“…Two studies suggest that pulmonary ventilation _ V E À Á could be an index of EE (Durnin and Edwards 1955;Ford and Hellerstein 1959). Indeed, _ V E is a parameter directly related to oxygen con-…”

Section: Introductionmentioning

confidence: 99%

Estimates of ventilation from measurements of rib cage and abdominal distances: a portable device

Gastinger

Sefati²,

Nicolas

et al. 2010

Eur J Appl Physiol

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“…Of the values obtained from other sources, the most important are for sitting and standing, which together contribute 16 Durnin and Edwards (1955) have suggested the usefulness of estimating energy expenditure from pulmonary ventilation: their proposals are discussed by Liddell (1962), who examined in detail the data presented here and compared them with results of other workers.…”

Section: Discussionmentioning

confidence: 99%

The Energy Expenditure of Coal Miners at Work

2009

Nutrition Reviews

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This survey was intended to provide a basis of information on the energy expenditures for the main component tasks in coal-mining, carried out at different rates and in different postures. Such information is frequently required for studies of the physiological effects of coal-mining; these values reported here were required in particular for studies intended to define thermal limits of the environment suitable for miners at non-mechanized coal-faces, a situation where the metabolic heat produced makes up a large proportion of the total heat load of the individual.Regression lines have been drawn between energy expenditure and speed of shovelling for the miner working in different postures. When forced to work lying on the floor the man's energy expenditure dropped, but his coal output also dropped. Walking to and from the coal-face along roadways of good height yielded energy expenditures comparable to those of treadmill walking, although generally slightly higher in value. Stooped walking generally increased the energy expenditure ofwalking, but to a smaller extent than was anticipated from previous laboratory work.Several time analyses of complete shifts from different collieries, in which the time spent at different tasks had been measured, yielded an average estimate of the energy expenditure for an eight-hour shift of 2,000 kcal.The coal-mining industry of Great Britain, one of the largest "heavy" industries in the world, employs well over two hundred thousand men at the coal-face alone, and more than that number elsewhere underground. Many among this large labour force expend energy daily in quantities that are greater than in most other large industrial concerns. A need to be able to estimate the energy production of miners working in different collieries, where physical conditions and the rate and pattern of work vary, led to the present investigation; it forms an integral part of a programme of research intended to determine thermal environmental conditions for everyday work at the coal-face (Lind, 1960) in which the contribution of metabolic heat to the total heat load would certainly be substantial. For this purpose it is desirable to know not only the man's total energy production in the course of a shift, but also the extent to which it varies from hour to hour.Generally, the measurement of energy expenditure of man in the course of his daily activities has been related either to his food requirements, or to the rearrangement of his work in such a way as to permit greater efficiency and productivity, coupled, if possible, with a reduction in the physiological strain. For these reasons the energy expenditures involved in some mining tasks have previously been reported from the East Midlands by Moss (1935), from Germany by Lehmann, Muller, and Spitzer (1950), and from Italy by Granati and Busca (1941). These earlier investigations into the energy cost of coal-mining are not entirely satisfactory as working conditions have changed much since the time of Moss, and foreign surveys made on men subjected ...

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“…Moreover, observers have noted departures from linearity at low work rates, and as the intensity of effort is increased, lactate accumulation leads to a disproportionate increase in ventilation (Durnin and Edwards 1955;Ford and Hellerstein 1959). My studies did not confirm earlier claims (Sharkey et al 1966) that ventilatory predictions of oxygen consumption were universally superior to heart rate estimates.…”

Section: Respiratory Minute Volumementioning

confidence: 96%

Measurement of human energy expenditure, with particular reference to field studies: an historical perspective

Shephard

Aoyagi

2011

Eur J Appl Physiol

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Over the years, techniques for the study of human movement have ranged in complexity and precision from direct observation of the subject through activity diaries, questionnaires, and recordings of body movement, to the measurement of physiological responses, studies of metabolism and indirect and direct calorimetry. This article reviews developments in each of these domains. Particular reference is made to their impact upon the continuing search for valid field estimates of activity patterns and energy expenditures, as required by the applied physiologist, ergonomist, sports scientist, nutritionist and epidemiologist. Early observers sought to improve productivity in demanding employment. Direct observation and filming of workers were supplemented by monitoring of heart rates, ventilation and oxygen consumption. Such methods still find application in ergonomics and sport, but many investigators are now interested in relationships between habitual physical activity and chronic disease. Even sophisticated questionnaires still do not provide valid information on the absolute energy expenditures associated with good health. Emphasis has thus shifted to use of sophisticated pedometer/accelerometers, sometimes combining their output with GPS and other data. Some modern pedometer/accelerometers perform well in the laboratory, but show substantial systematic errors relative to laboratory reference criteria such as the metabolism of doubly labeled water when assessing the varied activities of daily life. The challenge remains to develop activity monitors that are sufficiently inexpensive for field use, yet meet required accuracy standards. Possibly, measurements of oxygen consumption by portable respirometers may soon satisfy part of this need, although a need for valid longer term monitoring will remain.

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Pulmonary Ventilation as an Index of Energy Expenditure

Cited by 49 publications

References 9 publications

Estimates of ventilation from measurements of rib cage and abdominal distances: a portable device

Estimates of ventilation from measurements of rib cage and abdominal distances: a portable device

The Energy Expenditure of Coal Miners at Work

Measurement of human energy expenditure, with particular reference to field studies: an historical perspective

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