Guest guest Posted May 29, 2001 Report Share Posted May 29, 2001 I would be interested to know what excatly is the cause of the increase in ones resting metabolic rate after exercise. I understand that the hormonal system has a role to play as well as the increase in protein synthesis. Anything else that would play a role? Maki Riddington Vancouver BC Every job is a self portrait of the person who does it.Autograph your work with excellence. _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 5, 2002 Report Share Posted June 5, 2002 There are two useful papers on this topic in a recent issue of Nature (9 May 2002, Vol 417). The first by Darveau et al. - Allometric cascade as a unifying principle of body mass effects of metabolism, pages 166-170 - and Weibel - The pitfalls of power laws, pages 131-132. [Would you kindly be able to quote the abstracts here, since not many people can afford to subscribe to Nature. Mel Siff] Professor M Winter The Centre for Sport and Exercise Science Sheffield Hallam University Collegiate Hall SHEFFIELD S10 2BP UK e.m.winter@... www.thecentreforsport.com ------------- Doug Schurman wrote: <I spoke to Tom Incledon about this about a year ago. This is what I recall he said. BMR (Basal Metabolic Rate) is more related to overall weight rather than lean mass. He said that the body has very similar systems requirements to maintain a fat cell as to maintain a muscle cell and that the metabolic difference between a fat cell and a muscle cell was small. In other word if you weight 200 with 20% fat or 200 with 10% fat you probably have a similar BMR given the other variables are the same (genetics, activity, etc..).> Mel Siff: Not simply bodymass - in medical circles, one's body surface area relative to one's bodymass is also regarded as an important factor, especially since the loss of heat from the body to the environment is through its surface, not its volume (or mass, where mass is a function of volume). The generation of heat, however, is within the volume of the body. Geigy Scientific Tables published by CIBA-Geigy (1981) offer useful information in this regard. This series states that BMR depends on factors including mass, sex, height, composition (lean body vs the rest), hormonal balance and even climatic and environmental conditions. It states that " Inasmuch as the metabolism of adipose tissue is modest compared with that of muscle tissue, it has been suggested that basal metabolism be expressed in terms of fat-free body mass, active cellular mass, muscular mass or similar physical parameters " (p 228). It goes on to say that " the discrepancies between the basal metabolism of men and women and the declining rate in advanced age largely disappear when compared with the fat-free body mass. " These tables show that the BMR for a thin (under 9% bodyfat) 70kg young male is about 15% higher than that of his fatter counterpart (20-24% bodyfat), while for a thin (15-19% bodyfat) 60kg young woman of the same weight her BMR is about 20% higher than for her fatter 60kg counterpart (>30% bodyfat). At all adult ages, the difference between male and female BMR is about 12-15%.(measured as calories expended per hour per unit of surface area). * Don't forget to sign all letters with full name and city of residence if you wish them to be published! Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 5, 2002 Report Share Posted June 5, 2002 There are two useful papers on this topic in a recent issue of Nature (9 May 2002, Vol 417). The first by Darveau et al. - Allometric cascade as a unifying principle of body mass effects of metabolism, pages 166-170 - and Weibel - The pitfalls of power laws, pages 131-132. [Would you kindly be able to quote the abstracts here, since not many people can afford to subscribe to Nature. Mel Siff] Professor M Winter The Centre for Sport and Exercise Science Sheffield Hallam University Collegiate Hall SHEFFIELD S10 2BP UK e.m.winter@... www.thecentreforsport.com ------------- Doug Schurman wrote: <I spoke to Tom Incledon about this about a year ago. This is what I recall he said. BMR (Basal Metabolic Rate) is more related to overall weight rather than lean mass. He said that the body has very similar systems requirements to maintain a fat cell as to maintain a muscle cell and that the metabolic difference between a fat cell and a muscle cell was small. In other word if you weight 200 with 20% fat or 200 with 10% fat you probably have a similar BMR given the other variables are the same (genetics, activity, etc..).> Mel Siff: Not simply bodymass - in medical circles, one's body surface area relative to one's bodymass is also regarded as an important factor, especially since the loss of heat from the body to the environment is through its surface, not its volume (or mass, where mass is a function of volume). The generation of heat, however, is within the volume of the body. Geigy Scientific Tables published by CIBA-Geigy (1981) offer useful information in this regard. This series states that BMR depends on factors including mass, sex, height, composition (lean body vs the rest), hormonal balance and even climatic and environmental conditions. It states that " Inasmuch as the metabolism of adipose tissue is modest compared with that of muscle tissue, it has been suggested that basal metabolism be expressed in terms of fat-free body mass, active cellular mass, muscular mass or similar physical parameters " (p 228). It goes on to say that " the discrepancies between the basal metabolism of men and women and the declining rate in advanced age largely disappear when compared with the fat-free body mass. " These tables show that the BMR for a thin (under 9% bodyfat) 70kg young male is about 15% higher than that of his fatter counterpart (20-24% bodyfat), while for a thin (15-19% bodyfat) 60kg young woman of the same weight her BMR is about 20% higher than for her fatter 60kg counterpart (>30% bodyfat). At all adult ages, the difference between male and female BMR is about 12-15%.(measured as calories expended per hour per unit of surface area). * Don't forget to sign all letters with full name and city of residence if you wish them to be published! Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 5, 2002 Report Share Posted June 5, 2002 There are two useful papers on this topic in a recent issue of Nature (9 May 2002, Vol 417). The first by Darveau et al. - Allometric cascade as a unifying principle of body mass effects of metabolism, pages 166-170 - and Weibel - The pitfalls of power laws, pages 131-132. [Would you kindly be able to quote the abstracts here, since not many people can afford to subscribe to Nature. Mel Siff] Professor M Winter The Centre for Sport and Exercise Science Sheffield Hallam University Collegiate Hall SHEFFIELD S10 2BP UK e.m.winter@... www.thecentreforsport.com ------------- Doug Schurman wrote: <I spoke to Tom Incledon about this about a year ago. This is what I recall he said. BMR (Basal Metabolic Rate) is more related to overall weight rather than lean mass. He said that the body has very similar systems requirements to maintain a fat cell as to maintain a muscle cell and that the metabolic difference between a fat cell and a muscle cell was small. In other word if you weight 200 with 20% fat or 200 with 10% fat you probably have a similar BMR given the other variables are the same (genetics, activity, etc..).> Mel Siff: Not simply bodymass - in medical circles, one's body surface area relative to one's bodymass is also regarded as an important factor, especially since the loss of heat from the body to the environment is through its surface, not its volume (or mass, where mass is a function of volume). The generation of heat, however, is within the volume of the body. Geigy Scientific Tables published by CIBA-Geigy (1981) offer useful information in this regard. This series states that BMR depends on factors including mass, sex, height, composition (lean body vs the rest), hormonal balance and even climatic and environmental conditions. It states that " Inasmuch as the metabolism of adipose tissue is modest compared with that of muscle tissue, it has been suggested that basal metabolism be expressed in terms of fat-free body mass, active cellular mass, muscular mass or similar physical parameters " (p 228). It goes on to say that " the discrepancies between the basal metabolism of men and women and the declining rate in advanced age largely disappear when compared with the fat-free body mass. " These tables show that the BMR for a thin (under 9% bodyfat) 70kg young male is about 15% higher than that of his fatter counterpart (20-24% bodyfat), while for a thin (15-19% bodyfat) 60kg young woman of the same weight her BMR is about 20% higher than for her fatter 60kg counterpart (>30% bodyfat). At all adult ages, the difference between male and female BMR is about 12-15%.(measured as calories expended per hour per unit of surface area). * Don't forget to sign all letters with full name and city of residence if you wish them to be published! Quote Link to comment Share on other sites More sharing options...
Guest guest Posted June 5, 2002 Report Share Posted June 5, 2002 Dear Mel As requested: Allometric cascade as a unifying principle of body mass effects on metabolism Darveau, C-A., Suarez, R.K., s, R.D. and Hochachka, P.W. The power function of basal metabolic rate scaling is expressed as a.M^b (a M to the power , where a corresponds to a scaling constant (intercept), M is body mass and b is the scaling exponent. The 3/4 power law (the best-fit b value for mammals) was developed from Kleiber's original analysis and, since then, most workers have searched for a single cause to explain the observed allometry. Here we present a multiple-causes model of allometry, where the exponent b is the sum of the influences of multiple contributors to metabolism and control. The relative strength of each contributor, with its own characteristic exponent value, is determined by the control contribution. To illustrate its use, we apply this model to maximum versus basal metabolic rates to explain the differing scaling behaviour of these two biological states in mammals. The main difference in scaling is that, for the basal metabolic rate, the O2 delivery steps contribute almost nothing to the global b scaling exponent, whereas for the maximum metabolic rate, the O2 delivery steps significantly increase the global b value. The second paper by Ewald R Weibel simply provides commentary on Darveau et al's proposition. I hope this helps. Professor M Winter The Centre for Sport and Exercise Science Sheffield Hallam University Collegiate Hall SHEFFIELD S10 2BP UK e.m.winter@... www.thecentreforsport.com -----Original Message----- From: Winter, M There are two useful papers on this topic in a recent issue of Nature (9 May 2002, Vol 417). The first by Darveau et al. - Allometric cascade as a unifying principle of body mass effects of metabolism, pages 166-170 - and Weibel - The pitfalls of power laws, pages 131-132. [Would you kindly be able to quote the abstracts here, since not many people can afford to subscribe to Nature. Mel Siff] Professor M Winter ------------- Doug Schurman wrote: <I spoke to Tom Incledon about this about a year ago. This is what I recall he said. BMR (Basal Metabolic Rate) is more related to overall weight rather than lean mass. He said that the body has very similar systems requirements to maintain a fat cell as to maintain a muscle cell and that the metabolic difference between a fat cell and a muscle cell was small. In other word if you weight 200 with 20% fat or 200 with 10% fat you probably have a similar BMR given the other variables are the same (genetics, activity, etc..).> Mel Siff: Not simply bodymass - in medical circles, one's body surface area relative to one's bodymass is also regarded as an important factor, especially since the loss of heat from the body to the environment is through its surface, not its volume (or mass, where mass is a function of volume). The generation of heat, however, is within the volume of the body. Geigy Scientific Tables published by CIBA-Geigy (1981) offer useful information in this regard. This series states that BMR depends on factors including mass, sex, height, composition (lean body vs the rest), hormonal balance and even climatic and environmental conditions. It states that " Inasmuch as the metabolism of adipose tissue is modest compared with that of muscle tissue, it has been suggested that basal metabolism be expressed in terms of fat-free body mass, active cellular mass, muscular mass or similar physical parameters " (p 228). It goes on to say that " the discrepancies between the basal metabolism of men and women and the declining rate in advanced age largely disappear when compared with the fat-free body mass. " These tables show that the BMR for a thin (under 9% bodyfat) 70kg young male is about 15% higher than that of his fatter counterpart (20-24% bodyfat), while for a thin (15-19% bodyfat) 60kg young woman of the same weight her BMR is about 20% higher than for her fatter 60kg counterpart (>30% bodyfat). At all adult ages, the difference between male and female BMR is about 12-15%.(measured as calories expended per hour per unit of surface area). * Don't forget to sign all letters with full name and city of residence if you wish them to be published! Quote Link to comment Share on other sites More sharing options...
Guest guest Posted September 2, 2002 Report Share Posted September 2, 2002 Just wondering, does anyone factor in your basal metabolic rate as the gauge for your daily calories? If so, what particular formula do you use? I know there are new devices out there that do the calculations for you. Has anyone ever used any? Thanks, Laurie Quote Link to comment Share on other sites More sharing options...
Guest guest Posted September 2, 2002 Report Share Posted September 2, 2002 Laurie, The Diet Power software calculates the BMR for you, and is surprisingly accurate. You must use the software quite precisely, however, for a about two weeks before it adjusts itself to your actual metabolism. The software is free for 30 days though, so that would do it for you. PS At least it used to be free for 30 days...if they've changed that policy I'm sure somebody will tell me. See www.dietpower.com. Suz Quote Link to comment Share on other sites More sharing options...
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