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sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a functional deficit, and the strength and gait-speed measures that matter.

14 questions · sorted by votes

40 votes 5 answers22k views
Is resistance training twelve times a week enough at 1,400 kcal a day?

The case in front of me: twelve · 1,400 kcal. I want to decide this in advance so that I am not deciding it under pressure later. Assume I will follow the plan I…

resistance-training
resistance-training

Loaded training as the primary intervention for retaining lean mass in a deficit: minimum effective dose, frequency versus volume, and why…

40 questions
lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
exercise
exercise

Training during substantial weight loss: cardiorespiratory work, step count, low energy availability, and how exercise interacts with the appetite…

36 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
weight-regain
weight-regain

Regain after stopping or reducing: the trajectory reported in the withdrawal extensions, how much is fluid, and what the maintenance arms tell us…

14 questions
asked by nadia_kowalczyk 14k · 2.2 years ago
39 votes5 answers23k views
How much protein in grams do I need at 81 kg on 1,200 kcal a day?

The specifics, since they change the answer: 81 kg · 1,200 kcal. I would rather understand the derivation than memorise the outcome. Two people I asked gave two…

protein-intake
protein-intake

Protein targets in grams per kilogram, per-meal distribution and the leucine threshold, and the evidence for a higher intake specifically during…

53 questions
nutrition
nutrition

Eating on a suppressed appetite: hitting nutritional targets inside a small energy budget, micronutrient risk, meal structure, and what the trial…

92 questions
lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by swab_and_wait 15k · 2.0 years ago
37 votes3 answers15k views
What proportion of trial participants actually stopped because of GI events, and how does that compare to real-world dropout?

I am trying to calibrate how likely it is that GI side effects end up being the reason someone stops, as opposed to being an unpleasant thing they get through. The…

gi-side-effects
gi-side-effects

The gastrointestinal cluster as a whole - nausea, vomiting, diarrhoea, constipation, reflux, early satiety - with trial incidence rates, dropout…

416 questions
discontinuation
discontinuation

Stopping treatment: tapering versus abrupt cessation, what the trial withdrawal arms measured, clinically driven stops, and the practical planning…

21 questions
clinical-trials
clinical-trials

Reading the primary literature properly: estimands, intention-to-treat versus per-protocol, confidence intervals, absolute versus relative…

913 questions
vomiting
vomiting

Emesis as a reported adverse event: trial incidence, its relationship to dose escalation rate, dehydration risk, and when it stops being a…

14 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by ellis_thorne 17k · 13 months ago
32 votes3 answers9.8k views
How far did my sodium and potassium intake actually fall when my calories halved?

I would like to sanity-check the electrolyte question with numbers rather than by adding a supplement and seeing what happens. My hypothesis is that the reason people…

electrolytes
electrolytes

Sodium, potassium and magnesium during reduced intake and GI losses: what the symptoms of a shortfall look like, when a panel is worth drawing,…

36 questions
nutrition
nutrition

Eating on a suppressed appetite: hitting nutritional targets inside a small energy budget, micronutrient risk, meal structure, and what the trial…

92 questions
fatigue
fatigue

Tiredness on treatment: how much is energy deficit, how much is dehydration or electrolyte drift, how much is genuinely drug-attributable, and…

38 questions
hydration
hydration

Fluid intake when thirst and intake cues are both blunted: how much of the early scale drop is fluid, how dehydration confounds a renal panel, and…

14 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by p_mkhize 41k · 2 months ago
26 votes0 answers4.1k views
Does a DEXA repeated every ten weeks give me an usable lean-mass trend?

Scale weight, waist circumference and a repetition maximum, all logged weekly. I suspect the honest answer is that it depends, in which case I would like to know on…

dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
muscle-loss
muscle-loss

Loss of contractile tissue during energy deficit: what fraction of total loss is lean mass, why the commonly quoted figures are measurement…

82 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by thermal_mass 16k · 6 months ago
20 votes 2 answers7.5k views
How do I tell headache from an energy deficit on 900 kcal a day?

Stated plainly: headache · 900 kcal. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything yet,…

fatigue
fatigue

Tiredness on treatment: how much is energy deficit, how much is dehydration or electrolyte drift, how much is genuinely drug-attributable, and…

38 questions
nutrition
nutrition

Eating on a suppressed appetite: hitting nutritional targets inside a small energy budget, micronutrient risk, meal structure, and what the trial…

92 questions
electrolytes
electrolytes

Sodium, potassium and magnesium during reduced intake and GI losses: what the symptoms of a shortfall look like, when a panel is worth drawing,…

36 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by rota_site 55k · 7 months ago
17 votes5 answers11k views
What fraction of loss on cagrilintide is lean mass according to SURMOUNT-2?

What I have: cagrilintide · SURMOUNT-2. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to…

lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
muscle-loss
muscle-loss

Loss of contractile tissue during energy deficit: what fraction of total loss is lean mass, why the commonly quoted figures are measurement…

82 questions
dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by swirl_dont_shake 19k · 10 months ago
15 votes5 answers11k views
What fraction of loss on mazdutide is lean mass according to SURMOUNT-1?

What I have: mazdutide · SURMOUNT-1. I can parse the result. I am less sure what it licenses me to conclude. I have deliberately not looked at anyone else’s…

lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
muscle-loss
muscle-loss

Loss of contractile tissue during energy deficit: what fraction of total loss is lean mass, why the commonly quoted figures are measurement…

82 questions
dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by otto_brenner 19k · 12 months ago
15 votes 3 answers8.4k views
What fraction of loss on dulaglutide is lean mass according to PIONEER-1?

What I am working with: dulaglutide · PIONEER-1. I would like help reading this properly rather than being told what conclusion to reach. I have the full report…

lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
muscle-loss
muscle-loss

Loss of contractile tissue during energy deficit: what fraction of total loss is lean mass, why the commonly quoted figures are measurement…

82 questions
dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by ravi_pillai 16k · 10 months ago
12 votes 5 answers26k views
What fraction of loss on cagrilintide is lean mass according to ATTAIN-1?

Details up front: cagrilintide · ATTAIN-1. I can parse the result. I am less sure what it licenses me to conclude. I have deliberately not looked at anyone else’s…

lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
muscle-loss
muscle-loss

Loss of contractile tissue during energy deficit: what fraction of total loss is lean mass, why the commonly quoted figures are measurement…

82 questions
dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by two_point_four 14k · 23 months ago
11 votes5 answers3.3k views
What fraction of loss on ecnoglutide is lean mass according to SURMOUNT-5?

The case in front of me: ecnoglutide · SURMOUNT-5. I would like to know the limits of what can be inferred from this. What I am trying to avoid is over-reading a…

lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
muscle-loss
muscle-loss

Loss of contractile tissue during energy deficit: what fraction of total loss is lean mass, why the commonly quoted figures are measurement…

82 questions
dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by haze_check 17k · 5 months ago
9 votes 3 answers8.6k views
Is a four-month stall adaptive thermogenesis or measurement error?

Intake is tracked, imperfectly, and I am aware of the direction of the error. I think I have a problem. I am not yet sure whether it is a real problem or a…

plateau
plateau

A stall in progress: distinguishing adaptive thermogenesis from measurement error from adherence drift, how long to observe before changing…

35 questions
weight-regain
weight-regain

Regain after stopping or reducing: the trajectory reported in the withdrawal extensions, how much is fluid, and what the maintenance arms tell us…

14 questions
dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by lucia_marchetti 18k · 8 months ago
2 votes 4 answers13k views
What fraction of loss on semaglutide is lean mass according to SURMOUNT-2?

Concretely: semaglutide · SURMOUNT-2. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the specifics…

lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
muscle-loss
muscle-loss

Loss of contractile tissue during energy deficit: what fraction of total loss is lean mass, why the commonly quoted figures are measurement…

82 questions
dexa
dexa

Dual-energy X-ray absorptiometry: what it measures, its precision limits, why hydration state and scan positioning move the numbers, and how to…

84 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by ravenna_pace 13k · 16 months ago
2 votes0 answers3.3k views
How much protein in grams do I need at 95 kg on 1,400 kcal a day?

Setup, so nobody has to ask: 95 kg · 1,400 kcal. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of…

protein-intake
protein-intake

Protein targets in grams per kilogram, per-meal distribution and the leucine threshold, and the evidence for a higher intake specifically during…

53 questions
nutrition
nutrition

Eating on a suppressed appetite: hitting nutritional targets inside a small energy budget, micronutrient risk, meal structure, and what the trial…

92 questions
lean-mass
lean-mass

Lean body mass as measured rather than assumed: what DEXA, BIA and air-displacement plethysmography each actually estimate, the body-composition…

164 questions
sarcopenia
sarcopenia

Clinically meaningful loss of muscle mass and function, particularly in older adults on treatment. Distinguishing a proportional reduction from a…

14 questions
asked by valentina_rossi 16k · 20 months ago
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