Premium
The effect of exercise intensity on sweat amino acid excretion (820.14)
Author(s) -
Stone Michael,
Buono Michael,
Kern Mark
Publication year - 2014
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.28.1_supplement.820.14
Subject(s) - sweat , excretion , medicine , endocrinology , exercise intensity , chemistry , intensity (physics) , physical exercise , zoology , heart rate , biology , blood pressure , physics , quantum mechanics
We examined the relationships between sweat gland amino acid (AA) secretion and exercise intensity as well as sweat and plasma AA concentrations as functions of AA molecular weight (MW). Ten subjects underwent 4 trials including a maximal graded exercise test and 3 submaximal bouts (low: 45% VO 2max , moderate: 60% VO 2max and high: 75% VO 2max ) for 30 min. Sweat was collected throughout exercise using macroducts placed on the forearm and blood was collected before and after exercise. Sweat AA excretion (pmol/cm 2 /min) was significantly greater (p<0.05) between the higher workloads and the 45% workload, but were not greater at the 75% versus 60% workload despite higher sweat rates, suggesting dermal conservation during high intensity exercise. With the exception of alanine, which was increased during the 75% workload, plasma concentrations of AA decreased during the 75% bout. Similar effects were not detected during the lower intensity bouts. Polynomial regression revealed a negative curvilinear relationship between plasma AA concentration and molecular weight ( r = ‐0.71, p = 0.002) as well as sweat AA excretion rate and MW ( r = ‐0.75, p = 0.004) implicating an influence of MW on AA handling.