Why the study?
Does maximal exercise alter sympathoadrenal and vagal activity in healthy young subjects?
Does maximal exercise alter sympathoadrenal and vagal activity in healthy young subjects?
Intense exercise increases sympathetic activity during exertion and induces persistent vagal activity afterward, which may contribute to post-exercise weakness.
Answers are grounded in this paper and cite their sources.
May explain post-exercise weakness via delayed vagal rebound; leaves open relevance in cardiovascular disease.
Exhaustive exercise is associated with a persistent sensation of weakness and sometimes nausea suggesting abdominal vagal activity. We measured plasma indices of sympathoadrenal (adrenaline, noradrenaline, dopamine) and vagal (pancreatic polypeptide) activity before, during and after submaximal and maximal exercise in healthy young subjects. Plasma adrenaline, noradrenaline and dopamine increased to 8.5 (range 7.4-40.5), 48.0 (32.3-100.5) and 1.8 (1.2-6.6) nmol 1-1 respectively (n = 5), during maximal exercise and decreased towards control values within 15 min of rest. Pancreatic polypeptide (n = 10) increased only during maximal exercise and reached its highest value, 48 (21-145) pmol 1-1, after exertion. The results conform to an increase in sympathetic activity during exercise and a persistent vagal activity after intense exercise which could contribute to the sensation of weakness.
No takes yet. Share an insight, caveat, or question.
Holmqvist et al. (1986) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: