Related by context. Frequent words. (Click for all words.) 55 releases endorphins 52 noradrenaline 52 chemical serotonin 49 endorphins 49 neurotransmitter dopamine 49 chemical dopamine 49 chills 48 norepinephrine 48 dopamine 48 overactivity 47 Dopamine 47 muscle contractions 47 catecholamines 47 neurotransmitter serotonin 47 excitatory 46 nerve impulses 46 endorphin 45 vasoconstriction 45 Oxytocin 45 Cortisol 45 chemical messengers 45 relaxant 45 Ghrelin 45 hormone cortisol 44 sensory nerves 44 relieves stress 44 neurotransmitters 44 cannabinoid receptors 44 anxiety insomnia 44 histamines 44 neuronal activity 44 skeletal muscles 43 vasodilation 43 neuropeptide 43 profuse sweating 43 homeostatic 43 tingles 43 neurochemical 43 premenstrual 43 induces 43 physiological responses 43 Serotonin 43 dopamine neurons 43 neurotransmitter 43 vasodilator 43 stimulates 42 overstimulation 42 serotonin 42 endocannabinoids 42 hypothalamic 42 vagus nerve 42 dopamine receptors 42 opioid receptors 42 sensations 42 potentiate 42 excitability 42 Aerobic exercise 42 autonomic nervous system 41 acetylcholine 41 corticosterone 41 wakefulness 41 extreme tiredness 41 nausea headache 41 trigeminal nerve 41 salivation 41 stimulation 41 pharmacologically 41 vasopressin 41 GABA 41 baclofen 40 hormone oxytocin 40 mental alertness 40 synaptic plasticity 40 aching joints 40 tingle 40 soothes 40 stress hormones 40 hormone melatonin 40 light headedness 40 N methyl 40 sexual arousal 40 orexin 40 electrical pulses 40 adrenalin 40 nucleus accumbens 40 stress hormone cortisol 40 oxygen uptake 39 neurotransmission 39 reversibly 39 contractility 39 NMDA receptors 39 limbic 39 shivers 39 throbbing headache 39 inducer 39 neurochemistry 39 TRPA1 39 dysregulated 39 neural pathways 39 arousal 39 inducers