Exercise and stress
What happens during exercise or stress, then during recovery: the adrenal glands, lymph that moves when you move, tendons.
A workout 
What happens in the body during and after exercise? Adrenaline, cortisol and lactate during exercise, then 48 hours of recovery.
Acute stress 
What happens in the body when you are stressed? A 15 minute oral exam: adrenaline within seconds, cortisol within twenty minutes.
Gelatin and tendons 
Do gelatin or collagen help repair tendons? 10 g of gelatin (cooked collagen) with vitamin C, isometric exercise one hour later, then months of rebuilding.
Reps in strength training 
How many reps should you do in strength training? Heavy or light load: what the muscle gains, what happens in the fibers, and whether to train to failure.
The adrenal glands 
What do the adrenal glands do? Cortisol, aldosterone, adrenaline: the gland in cross section, and its responses to stress, waking, standing up or a salty meal.
The vagus nerve 
How do you stimulate the vagus nerve? Slow breathing, cold water on the face: the heart's brake and the pulse beat by beat, animated.
Breath holding 
What happens in the body during breath holding? Oxygen, CO2, lungs squeezed at 40 m and samba on the way up: static and depth breath holding, animated.
Lymph in motion 
How does lymph flow without a heart to pump it? Valves, muscles and breathing: why moving pushes lymph forward.
What happens in the body during and after exercise? Adrenaline, cortisol and lactate during exercise, then 48 hours of recovery.
Acute stress What happens in the body when you are stressed? A 15 minute oral exam: adrenaline within seconds, cortisol within twenty minutes.
Gelatin and tendons Do gelatin or collagen help repair tendons? 10 g of gelatin (cooked collagen) with vitamin C, isometric exercise one hour later, then months of rebuilding.
Reps in strength training How many reps should you do in strength training? Heavy or light load: what the muscle gains, what happens in the fibers, and whether to train to failure.
The adrenal glands What do the adrenal glands do? Cortisol, aldosterone, adrenaline: the gland in cross section, and its responses to stress, waking, standing up or a salty meal.
The vagus nerve How do you stimulate the vagus nerve? Slow breathing, cold water on the face: the heart's brake and the pulse beat by beat, animated.
Breath holding What happens in the body during breath holding? Oxygen, CO2, lungs squeezed at 40 m and samba on the way up: static and depth breath holding, animated.
Lymph in motion How does lymph flow without a heart to pump it? Valves, muscles and breathing: why moving pushes lymph forward.