Topic
Specific dynamic action
About: Specific dynamic action is a research topic. Over the lifetime, 401 publications have been published within this topic receiving 16582 citations.
Papers published on a yearly basis
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Papers
TL;DR: The fat balance equation is more dynamic than the original static equation and reflects energy balance under normal conditions of free access to foods and does not need metabolic abnormalities or genetic mutations to explain weight gain.
Abstract: The increasing prevalence of obesity in many countries means that it should now be considered a pandemic.1 One estimate from Australia suggests that over the past decade the average adult has been adding 1 gram a day to body weight.2 This has occurred in the face of increasing knowledge, awareness, and education about obesity, nutrition, and exercise. It has been suggested that a paradigm shift is necessary if future progress is to be made.3
Traditionally, weight gain was thought of as caused by eating too much or exercising too little, or both (changes in weight=energy intake-energy expenditure). This led to the search for small deficiencies in energy metabolism such as a reduced thermic effect of food to explain obesity.4 Treatment was dominated by calorie counting, and public health messages extolled people to balance their intake and output. This paradigm has changed with the increasing understanding of the dynamic relations between energy stores, appetite mechanisms, and energy metabolism and of the wider recognition of nutrient partitioning.5 6 From studies which have shown that fat balance is equivalent to energy balance,7 the fat balance equation was developed (rate of change of fat stores=rate of fat intake-rate of fat oxidation).5 This equation is more dynamic than the original static equation and reflects energy balance under normal conditions of free access to foods. Because fat intake and oxidation are not closely balanced,8 this approach does not need metabolic abnormalities or genetic mutations to explain weight gain. Indeed, the differences in body fat between people living in the same environment could be better described as normal physiological variation. This paradigm is more helpful in explaining changes in body fat within an individual over time, but it does not account for the wider influences within and around individuals …
994 citations
TL;DR: There are innumerable opportunities for research in SDA including coverage of unexplored taxa, investigating the underlying sources, determinants, and the central control of postprandial metabolism, and examining the integration of SDA across other physiological systems.
Abstract: For more than 200 years, the metabolic response that accompanies meal digestion has been characterized, theorized, and experimentally studied. Historically labeled “specific dynamic action” or “SDA”, this physiological phenomenon represents the energy expended on all activities of the body incidental to the ingestion, digestion, absorption, and assimilation of a meal. Specific dynamic action or a component of postprandial metabolism has been quantified for more than 250 invertebrate and vertebrate species. Characteristic among all of these species is a rapid postprandial increase in metabolic rate that upon peaking returns more slowly to prefeeding levels. The average maximum increase in metabolic rate stemming from digestion ranges from a modest 25% for humans to 136% for fishes, and to an impressive 687% for snakes. The type, size, composition, and temperature of the meal, as well as body size, body composition, and several environmental factors (e.g., ambient temperature and gas concentration) can each significantly impact the magnitude and duration of the SDA response. Meals that are large, intact or possess a tough exoskeleton require more digestive effort and thus generate a larger SDA than small, fragmented, or soft-bodied meals. Differences in the individual effort of preabsorptive (e.g., swallowing, gastric breakdown, and intestinal transport) and postabsorptive (e.g., catabolism and synthesis) events underlie much of the variation in SDA. Specific dynamic action is an integral part of an organism’s energy budget, exemplified by accounting for 19–43% of the daily energy expenditure of free-ranging snakes. There are innumerable opportunities for research in SDA including coverage of unexplored taxa, investigating the underlying sources, determinants, and the central control of postprandial metabolism, and examining the integration of SDA across other physiological systems.
646 citations
TL;DR: The chief purpose of the present paper is to provide information on feeding and growth in brown trout and to develop equations to estimate the various components of the energy budget.
Abstract: C is the total energy content of the food consumed by the fish, F is the energy value of the faeces, U is the energy value of the excretory products, AB is the total change in the energy value of body materials (growth or loss in energy content) and includes any reproductive products released by the fish, R is the total energy of metabolism which is subdivided into three components: R. is the energy equivalent to that released in the course of metabolism in unfed and resting fish (standard metabolism), Ra is the energy required for swimming and other activity, Rd is the energy required for the processes of digestion, movement and deposition of food materials (including specific dynamic action). The extensive literature on energetics in fish has recently been reviewed by Beamish, Niimi & Lett (1975). Few workers have published complete energy budgets and have studied the effects of varying body size, temperature and ration size. The chief purpose of the present paper is to provide this information for brown trout and to develop equations to estimate the various components of the energy budget. Previous papers have dealt with various aspects of feeding and growth in brown trout (Elliott 1972, 1975a,b,c,d, 1976a,b) and the information in these papers is used extensively in the construction of the energy budgets. All the methods used in the experiments are described in detail in these previous papers. The methods used in the construction of the energy budgets are described in the appropriate part of the results.
563 citations
TL;DR: It is remarkable to observe that in adults of most species energy intake is equal to expenditure, and thus energy balance and body weight are maintained over long periods of time, and an extension of this concept would suggest that increases in food intake might elicit a rise in expenditure.
354 citations
TL;DR: A three-parameter curve was developed to fit the data and reduced noise and gave additional information about the TEF, which was positively correlated with FFM and MS and negatively correlated with MS2, percent body fat, and meal composition.
261 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 3 |
| 2024 | 10 |
| 2023 | 15 |
| 2022 | 10 |
| 2021 | 10 |
| 2020 | 13 |