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Muscle health
The loss of muscle mass and strength is now recognised as a central marker of longevity, and yet it too often remains invisible in our consultations, masked by a simple scale or a reassuring BMI. This training invites you to understand, from the biochemical mechanisms to concrete clinical actions, why and how to…
70 lessons · Lifetime access · Online
These trainings are delivered in French. This page is translated for your convenience; the course videos and materials remain in French.
Overview
The loss of muscle mass and strength is now recognised as a central marker of longevity, and yet it too often remains invisible in our consultations, masked by a simple scale or a reassuring BMI. This training invites you to understand, from the biochemical mechanisms to concrete clinical actions, why and how to optimise the muscle health of every person you support, whatever their reason for consulting.
What you will learn
- Understand the main pathways of muscle protein synthesis and breakdown (mTOR, AMPK) and the balance to seek between building and recycling, with the associated nutritional levers (leucine, arginine, serine, glutamine, HMB, measured insulin).
- Master the energy metabolism of the muscle, from ATP production to mitochondrial coupling and uncoupling, including oxidative stress and the antioxidant defences that work in synergy.
- Stimulate mitochondrial biogenesis and mitophagy, and identify the lifestyle levers that activate them (resistance training, endurance and HIIT, fasting, cold and heat exposure, photobiomodulation).
- Concretely assess muscle health in consultation, identify in whom to optimise it first, and use accessible tools such as grip strength, functional tests and functional biology.
- Build personalised recommendations in nutrition, supplementation and physical activity, and deconstruct common misconceptions about proteins and creatine.
- Link muscle health to mitochondrial health, the gut microbiota and the hormonal climate, to always trace back to the deepest cause.
On the programme
- Introduction: the muscle as a biomarker of longevity, supported by a literature review (muscle mass, grip strength, sarcopenia and mortality).
- Reminders of skeletal muscle anatomy and physiology: sarcomere, fibre types, neuromuscular junction, excitation-contraction coupling and the key role of ATP.
- Biochemistry of muscle health: protein synthesis and breakdown (MPS and MPB), mTOR and AMPK pathways, ATP energy pathways, mitochondrial coupling and uncoupling, oxidative stress, mitochondrial biogenesis and mitophagy.
- Adaptation to extreme temperatures (cold and heat), photobiomodulation, and the link between the mitochondria and the gut microbiota.
- The factors that influence muscle health: nutrition, physical activity, hormonal climate and the anabolic resistance linked to age.
- Assessment in practice: in which contexts and in whom to act (metabolic, mental, osteoarticular health, immunity, cancers), which criteria and which tools to use.
- Functional nutrition, supplementation and physical activity, with contributions from invited experts and a practical training guide.
- Myths or realities about proteins and creatine, then correction of the knowledge assessment quiz.
Who it is for
This training is for healthcare professionals and therapists committed to prevention and the optimisation of health, in micronutrition and functional medicine, as well as care practitioners and sports coaches who wish to anchor their recommendations in solid biochemical and physiological foundations.
At the end of the training
You will be able to explain the mechanisms underlying muscle health and justify your management choices rigorously, rather than reproducing standardised protocols. You will be able to assess muscle health with concrete tools, identify the people to support first, and personalise your recommendations in nutrition, supplementation and lifestyle. You will thus be able to contribute to building muscle health, in the service of healthier ageing.
Programme
Total video duration: 21 h 40 min
Santé musculaire - Formation Vidéo
- Quiz de début de formation
- M1 INTRODUCTION45 min
- M2 ANATOMIE MUSCULAIRE19 min
- M3-1 MPS _ MPB47 min
- M3-2A1 METABOLISME ENERGETIQUE29 min
- M3-2A2 COUPPLAGE _ DECOUPLAGE MITOCHONDRIAL27 min
- M3-2A3 STRESS OXYDANT41 min
- M3-2B BIOGENESE MITOCHONDRIALE ET MITOPHAGIE45 min
- M3-2C FROID _ CHAUD _ PHOTOBIOMODULATION45 min
- M3-3 MICROBIOTE ET MITOCHONDRIE26 min
- M4 FACTEURS INFLUENCANT LA MPS44 min
- M5-0 LE MUSCLE ORGANE ENDOCRINE INTRODUCTION14 min
- M5-1 SANTE METABOLIQUE26 min
- M5-2 SANTE MENTALE36 min
- M5-3 SANTE IMMUNITAIRE11 min
- M5-4 SANTE OSSEUSE26 min
- M5-5 CANCERS19 min
- M6-1 CRITERES EVALUATION15 min
- M6-2 EVALUATION CLINIQUE19 min
- M6-3 EVALUATION BIOLOGIQUE44 min
- M7-A1' ANALOGUES GLP142 min
- M7-A1 NUTRITION PROTEINES59 min
- M7-A2 NUTRITION GLUCIDES25 min
- M7-A3 NUTRITION LIPIDES17 min
- M7-B1 COMPLEMENTATION MITOCHONDRIE1 h 06 min
- M7-B2 COMPLEMENTATION MPS1 h 15 min
- M7-B3 COMPLEMENTATION HORMONES53 min
- M7-C ACTIVITE PHYSIQUE42 min
- M7-C ACTIVITE PHYSIQUE BONUS21 min
- M8 MYTHES VS REALITE1 h 01 min
- M9- CORRECTION QUIZ 2.01 h 24 min
- M10 CONCLUSION8 min
- MODULE EXPERT ACTIVITE PHYSIQUE DAVID DHONDT56 min
- MODULE EXPERT COMPLEMENTATION MYRIAM HOCQUEL1 h 07 min
- MODULE EXPERT COMPLEMENTATION PR CASTRONOVO48 min
- Quiz de fin de formation
Podcast audio
- M1 INTRODUCTION
- M2 ANATOMIE MUSCULAIRE
- M3-1 MPS _ MPB
- M3-2A1 METABOLISME ENERGETIQUE
- M3-2A2 COUPLAGE _ DECOUPLAGE MITOCHONDRIAL
- M3-2A3 STRESS OXYDANT
- M3-2B BIOGENESE MITOCHONDRIALE ET MITOPHAGIE
- M3-2C FROID _ CHAUD _ PHOTOBIOMODULATION
- M3-3 MICROBIOTE ET MITOCHONDRIE
- M4 FACTEURS INFLUENCANT LA MPS
- M5-0 MUSCLE ORGANE ENDOCRINE
- M5-1 SANTE METABOLIQUE
- M5-2 SANTE MENTALE
- M5-3 SANTE IMMUNITAIRE
- M5-4 SANTE OSSEUSE
- M5-5 CANCERS
- M6-1 CRITERES EVALUATION
- M6-2 EVALUATION CLINIQUE
- M6-3 EVALUATION BIOLOGIQUE
- M7-A1' ANALOGUES GLP1
- M7-A1 NUTRITION PROTEINES
- M7-A2 NUTRITION GLUCIDES
- M7-A3 NUTRITION LIPIDES
- M7-B1 COMPLEMENTATION MITOCHONDRIE
- M7-B2 COMPLEMENTATION MPS
- M7-B3 COMPLEMENTATION HORMONES
- M7-C ACTIVITE PHYSIQUE
- M7-C ACTIVITE PHYSIQUE BONUS
- M8 MYTHE VS REALITE
- M9 CORRECTION QUIZ 2.0
- M10 CONCLUSION
- MODULE EXPERT ACTIVITES PHYSIQUES DAVID DHONDT
- MODULE EXPERT COMPLEMENTATION MITOCHONDRIE PR CASTR
- MODULE EXPERT COMPLEMENTATION MYRIAM HOCQUEL
Video Audio PDF handout
Frequently asked questions
Why are mitochondrial biogenesis and mitophagy both essential for muscle health?
Biogenesis creates new, functional mitochondria in response to controlled energetic stress, while mitophagy selectively eliminates dysfunctional mitochondria. It is their dynamic balance that ensures the quality and density of the mitochondrial network. When this balance breaks down, defective mitochondria accumulate, becoming sources of oxidative stress, insulin resistance and sarcopenia.
Why is the mitochondrion both the main source and the first target of oxidative stress?
During oxidative phosphorylation, about 1 to 2% of electrons escape the respiratory chain, mainly at complexes 1 and 3, and react directly with oxygen to form the superoxide anion. The mitochondrion therefore itself produces free radicals, while being particularly vulnerable to their effects on its membrane lipids and its mitochondrial DNA.
Why should cold exposure be avoided right after a strength training session?
A resistance session aims to activate the mTOR pathway to stimulate muscle protein synthesis and anabolism. However, cold reduces blood flow and inhibits mTOR signaling. Applying it immediately after a strength session is therefore counterproductive. Dr Anne Lucas, PharmD, recommends waiting at least six hours or reserving it for rest days.
What is the difference between a coupled and an uncoupled mitochondrion?
In a coupled mitochondrion, the protons pumped into the intermembrane space re-enter exclusively via complex V (ATP synthase), producing ATP. In an uncoupled mitochondrion, some protons bypass this complex via protein channels (UCPs), and the energy is dissipated as heat, without ATP production.
Why is leucine the most important amino acid for muscle protein synthesis?
Leucine can inhibit Sestrin 2, which lifts the inhibition on Gator 2, which in turn inhibits Gator 1, allowing activation of the Rag GTPase complex (RagA/B-RagC/D) and thus activation of mTORC1. This precise biochemical mechanism explains why BCAAs, which contain leucine, are effective at stimulating MPS. Dr Anne Lucas, PharmD, recommends an intake of at least 2 to 3 grams of leucine at each meal.
Why is magnesium essential for muscle contraction and ATP synthesis?
ATP always functions as an ATP-magnesium complex: without magnesium, ATP synthase cannot produce ATP and the myosin heads cannot hydrolyze ATP to generate movement. A magnesium deficit therefore directly compromises muscle contraction and recovery. Dr Anne Lucas, PharmD, notes that this ATP-magnesium pairing is inseparable, from the contraction mechanism all the way to oxidative phosphorylation.
Why focus on muscle health regardless of the reason for consultation?
Muscle mass and strength are biomarkers independently associated with all-cause mortality, on par with sleep or stress management. Dr Anne Lucas, PharmD, insists: regardless of the practitioner's specialty (digestive, mental health, metabolic, autoimmune), optimizing muscle health is one of the pillars of a successful lifestyle and should be systematically assessed.
What is the basic structure of muscle contraction and which elements are essential?
The contractile unit is the sarcomere, made up of actin (thin) filaments and myosin (thick) filaments. Proper contraction requires three key elements: acetylcholine (nerve trigger), calcium (released from the sarcoplasmic reticulum to lift the tropomyosin block on actin) and ATP (for myosin head movement and relaxation). The absence of any one of these elements blocks the contraction-relaxation cycle.
Why did Dr Anne Lucas, PharmD, add this module on the mitochondria-microbiota link?
This module was added at the suggestion of Prof. Vincenzo Castronovo, who pointed out the absence of this link in the training. Dr Anne Lucas, PharmD, acknowledges that the volume of the training was already substantial (600 slides), but that this chapter, even if short, is essential for understanding the root causes of mitochondrial dysfunction.
What types of physical exercise are most effective at stimulating mitochondrial biogenesis?
Zone 2 endurance and, above all, HIIT are the most effective modalities because they strongly activate AMPK and the sirtuins, which converge on PGC-1alpha, the master regulator of biogenesis. Resistance training stimulates mTOR more (hypertrophy) and only moderately activates mitochondrial biogenesis. Dr Anne Lucas, PharmD, recommends alternating two to three HIIT sessions and two to three resistance sessions per week, on opposite days.
Which molecules activate uncoupling proteins (UCPs) and can therefore promote uncoupling?
UCPs are activated by free fatty acids, certain myokines (such as irisins), catecholamines (adrenaline, noradrenaline), polyphenols (resveratrol, epigallocatechin gallate) and T3 (triiodothyronine), the bioactive form of thyroid hormones. Conversely, GDP inhibits their activity.
What are the main bacterial metabolites that influence mitochondrial function?
The four major categories are: butyrate (and other short-chain fatty acids such as acetate and propionate), urolithins A and B derived from ellagitannins, indoles derived from tryptophan, and secondary bile acids. Each acts on specific signaling pathways (AMPK, SIRT1, SIRT3, NRF2, PGC-1alpha) to regulate mitochondrial biogenesis and mitophagy. Tryptophan-derived indoles in particular activate NRF2 and SIRT3, a mitochondrial deacetylase distinct from SIRT1, to strengthen mitochondrial antioxidant defenses.
What is the epidemiological evidence linking muscle mass and mortality?
The meta-analysis by Wang & Hall (PLOS One, 2023), covering 16 prospective studies and more than 80,000 participants, shows that a low skeletal muscle mass index (SMI) is associated with a 57% increased risk of death (RR = 1.57; 95% CI: 1.25-1.96; p = 0.001), independent of age, weight and comorbidities.
Why supplement with magnesium when prescribing creatine?
Ingested creatine must be phosphorylated by creatine kinase (which requires ATP and therefore magnesium) to form phosphocreatine, the only form useful as an immediate energy buffer reserve. Without sufficient magnesium, creatine cannot be stored efficiently as phosphocreatine, and the effect on muscle power and recovery will be reduced.
What are the functional differences between type 1, 2A and 2X muscle fibers?
Type 1 fibers are slow, purely oxidative in metabolism, rich in mitochondria (red color) and suited to endurance. Type 2A fibers are intermediate, with mixed oxidative and glycolytic metabolism (pink color), for mixed moderate-power efforts. Type 2X fibers are fast, glycolytic, low in mitochondria (white color), suited to strength and explosiveness but highly fatigable. Genetics, training and age modify the distribution of these fiber types.
Which cellular pathways differentiate the effect of cold from the effect of heat on the mitochondrion?
Cold acts as a controlled energetic stress that activates AMPK, then SIRT1, and converges on PGC-1alpha to stimulate mitochondrial biogenesis and lipid oxidation. Heat, for its part, activates heat shock proteins (HSP70, HSP90) and stimulates selective mitophagy via SIRT1. The two pathways are complementary: biogenesis and mitophagy must be coupled to maintain a well-functioning mitochondrial pool.
What cofactors are essential for the proper function of mitochondrial antioxidant enzymes?
Mitochondrial superoxide dismutase (SOD2) requires manganese as a cofactor, while cytosolic SOD (SOD1) uses zinc and copper. Glutathione peroxidase (GPX) depends on selenium (cofactor) and reduced glutathione (substrate). Catalase needs iron to convert hydrogen peroxide into water.
What is the role of the mechanical signal in protein synthesis, relative to the nutritional signal?
The mechanical signal (contraction, resistance exercise) is considered the primary signal: it activates FAK (Focal Adhesion Kinase) via cytoskeleton deformation, which generates a lipid messenger, phosphatidic acid, that promotes relocalization of the mTORC1 complex to the lysosome. Without this mechanical signal, amino acid intake alone is insufficient to trigger effective protein synthesis.
Is lactate responsible for cramps and muscle fatigue?
No. Dr Anne Lucas, PharmD, debunks this misconception: lactate is not a waste product but an energy substrate and a metabolic signal. It is the accumulation of H+ ions (protons) that causes metabolic acidosis and rapid fatigue during intense efforts, not lactate itself. Lactate can even be reused as an energy source.
Is muscle strength a better predictor of longevity than body weight?
Yes, according to the study by Celis-Morales et al. (BMJ, 2018) covering close to 500,000 participants from the UK Biobank: each 5 kg decrease in grip strength is associated with a 16% increase in all-cause mortality, 17% for cardiovascular disease and 7% for cancer mortality. These associations remain independent of BMI and physical activity level, which makes muscle strength a superior predictor to weight.
Why do some studies on high-dose vitamin C or E supplementation show counterintuitive, even pro-oxidant, effects?
Every antioxidant, once it has neutralized a free radical, becomes temporarily oxidized and pro-oxidant if it is not regenerated by a reducing molecule. Giving a single molecule at a high dose without providing its recycling partners (vitamin E regenerated by vitamin C, itself regenerated by glutathione and NADPH) breaks the regeneration chain and results in an excess of the oxidized molecule.
What is the role of UCP1 proteins in cold-induced adaptive thermogenesis?
During cold exposure, mitochondria in brown and beige adipose tissue express uncoupling proteins (UCP1) that allow protons to return to the matrix without passing through ATP synthase. This uncoupling produces heat instead of ATP, increases oxygen consumption and stimulates lipid beta-oxidation. The AMP/ATP ratio rises, thereby activating AMPK and mitochondrial biogenesis.
What micronutrients and phytoactives concretely support mitochondrial biogenesis?
The key cofactors are magnesium (activation of kinases and AMPK), vitamin B3 in its NAD+ precursor forms (NMN, NR), polyphenols such as resveratrol, quercetin and green tea epigallocatechin gallate (energy-stress mimetics that activate AMPK and sirtuins), omega-3 EPA/DHA, berberine (a direct AMPK activator, comparable to metformin), and curcumin. Alpha-ketoglutarate and NMN also improve the NAD+/NADH ratio.
What are the three main pathways of muscle protein breakdown, and how do they interrelate?
The first pathway is the ubiquitin-proteasome system (UPS), specific to contractile proteins (actin, myosin), particularly active during inactivity or chronic inflammation. The second is the autophagy-lysosome pathway, non-specific, which recycles damaged organelles and protein aggregates. The third is the calpain-protease pathway, calcium-dependent, which acts as a preparatory pathway by fragmenting myofibrils to make them accessible to the first two pathways.
Why does moderate uncoupling reduce the production of mitochondrial free radicals?
When the proton gradient (delta psi) is too high, electrons leak from complexes 1 and 3 of the respiratory chain and react prematurely with oxygen to form the superoxide anion. A slight uncoupling lowers this delta psi, speeds up electron flow, reduces electron leakage and therefore decreases the production of reactive oxygen species.
Why is ATP essential not only for contraction but also for muscle relaxation?
ATP is required at every step of the actin-myosin cycle: the power stroke of the myosin heads, the dissociation of the actin-myosin bridge, and calcium recapture via the SERCA pump (ATP-dependent). Without ATP, actin-myosin bridges cannot break, which explains rigor mortis: since mitochondria stop producing ATP after death, the filaments remain locked.
What is the role of butyrate beyond protecting the colonic mucosa?
Beyond its trophic effect on colonocytes and its role as an HDAC inhibitor (of interest in patients with a history of colon cancer), butyrate activates AMPK and PGC-1alpha, increases beta-oxidation and reduces oxidative stress. It thus directly promotes mitochondrial biogenesis and the optimization of energy metabolism.
How should sauna be integrated into the week relative to physical activity?Full answer inside the training →
How does bacterial LPS disrupt mitochondrial biogenesis?Full answer inside the training →
How do insulin and IGF-1 slow muscle catabolism, and why is insulin resistance a problem?Full answer inside the training →
How does the cascade recycling of antioxidants work, and what is its central molecule?Full answer inside the training →
What role does acetylcholine play in muscle contraction, and why does this matter in micronutrition?Full answer inside the training →
How does mitophagy select which mitochondria to eliminate via the PINK1-Parkin pathway?Full answer inside the training →
What is the specific role of UCP1, and where is it found?Full answer inside the training →
What is sarcopenia and what is its impact on survival?Full answer inside the training →
What essential cofactors of the Krebs cycle should be assessed in a micronutrition workup?Full answer inside the training →
What is the role of AMPK in muscle protein breakdown, and why is it not always harmful?Full answer inside the training →
How does mitochondrial uncoupling improve metabolic flexibility?Full answer inside the training →
How does aging influence the composition of muscle fiber types?Full answer inside the training →
How many strength training sessions per week are enough to significantly reduce mortality?Full answer inside the training →
What biological markers can be used to assess intestinal dysbiosis or metabolic endotoxemia?Full answer inside the training →
What is the role of coenzyme Q10 in the respiratory chain, and why do statins justify its supplementation?Full answer inside the training →
What is the difference between the PINK1-Parkin pathway and the BNIP3-NIX pathway in mitophagy?Full answer inside the training →
What is the difference between NADH and NADPH in the cell?Full answer inside the training →
What contrast therapy protocol (hot-cold) is recommended, and in what order?Full answer inside the training →
What are the three pathways for ATP regeneration in muscle, and in which contexts do they come into play?Full answer inside the training →
Why does optimizing omega-3 status improve mitochondrial function?Full answer inside the training →
What is browning of adipose tissue, and how is it linked to uncoupling?Full answer inside the training →
What is photobiomodulation, and what is its main mitochondrial target?Full answer inside the training →
Why is chronic mTOR activation detrimental to mitochondrial turnover?Full answer inside the training →
Why is BMI insufficient to assess a patient's mortality risk?Full answer inside the training →
What is mitohormesis, and why is it beneficial for mitochondrial health?Full answer inside the training →
What are the main nutritional levers for limiting muscle catabolism?Full answer inside the training →
What is the link between aging, the loss of butyrate-producing bacteria and sarcopenia?Full answer inside the training →
What practical tools are offered to practitioners for assessing muscle health in the office?Full answer inside the training →
What practical stimuli promote mitohormesis in a patient?Full answer inside the training →
Why are mitochondrial density and function a key factor in muscle health according to this lesson?Full answer inside the training →
What nutritional tools can be used to induce moderate mitochondrial uncoupling in a patient?Full answer inside the training →
How do chronic stress and cortisol affect mitophagy and muscle health?Full answer inside the training →
What role do secondary bile acids play in mitochondrial health?Full answer inside the training →
What clinical benefits does photobiomodulation provide for muscle and metabolic health?Full answer inside the training →
What is the relative importance of the Krebs cycle compared with the oxidative phosphorylation chain in ATP production?Full answer inside the training →
How can exercise both protect muscle and promote muscle wasting?Full answer inside the training →
What is the positioning of the micronutrition practitioner relative to the sports coach?Full answer inside the training →
How does cold exposure improve metabolic flexibility?Full answer inside the training →
What are the main approaches for restoring the microbiota-mitochondria balance in practice?Full answer inside the training →
What balance should be sought between mTORC1 and AMPK for good long-term muscle health?Full answer inside the training →
In which clinical situation should mitochondrial oxidative stress be watched particularly closely, and how can it be assessed?Full answer inside the training →
What role does heat exposure (sauna) play in mitophagy?Full answer inside the training →
What are the risks of insufficient or, conversely, excessive uncoupling?Full answer inside the training →
Why is combining cold and heat more effective than each modality separately?Full answer inside the training →