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M S Sothmann

Publications and source records attributed to M S Sothmann.

22 records · Page 2Linked to original sources
PubMed1987

Plasma free and sulfoconjugated catecholamine responses to varying exercise intensity.

Plasma free catecholamines rise during exercise, but sulfoconjugated catecholamines reportedly fall. This study examined the relationship between exercise intensity and circulating levels of sulfoconjugated norepinephrine, epinephrine, and dopamine. Seven exercise-trained men biked at approximately 30, 60, and 90% of their individual maximal oxygen consumption (VO2max) for 8 min. The 90% VO2max period resulted in significantly increased plasma free norepinephrine (rest, 219 +/- 85; exercise, 2,738 +/- 1,149 pg/ml; P less than or equal to 0.01) and epinephrine (rest, 49 +/- 49; exercise, 555 +/- 516 pg/ml; P less than or equal to 0.05). These changes were accompanied by consistent increases in sulfoconjugated norepinephrine at both the 60% (rest, 852 +/- 292; exercise, 1,431 +/- 639; P less than or equal to 0.05) and 90% (rest, 859 +/- 311; exercise, 2,223 +/- 1,015; P less than or equal to 0.05) VO2max periods. Plasma sulfoconjugated epinephrine and dopamine displayed erratic changes at the three exercise intensities. These findings suggest that sulfoconjugated norepinephrine rises during high-intensity exercise.

Adult↗
PubMed1984

Influence of catecholamine activity on the hierarchical relationships among physical fitness condition and selected personality characteristics.

Tested male Ss (N = 34) to determine how changes in the urinary excretion patterns of selected catecholamines and their metabolites affect the multivariate relationships involving variables that measure physical fitness condition and selected personality characteristics. Urine specimens were collected from each S after sleep and during occupational activities and analyzed for six catecholamine-related variables. Those measures were combined with six personality variables (MMPI) and a physical fitness score (Ismail Criterion), and subjected to first- and second-order factor analyses. The findings indicated an association between low physical fitness and high self-reported anxious depression during the occupational period, but not at rest. The changes in the factor structures were statistically mediated by changes in the concentrations of the biochemical variables across the collection periods. This suggests that the relationships between physical fitness and personality are augmented during catecholamine reactivity to occupational stress.

Adult↗
PubMedDate not supplied

Relationships between urinary catecholamine metabolites, particularly MHPG, and selected personality and physical fitness characteristics in normal subjects.

Thirty-four normal male subjects were tested to determine the relationships between physical fitness condition (Ismail criterion), levels of self-reported depression (MMPI) and anxiety (Welsh criterion), and the urinary concentrations of 3-methoxy-4-hydroxyphenylglycol (MHPG), normetanephrine (NM), and metanephrine (M). Urinary samples were collected after sleep and during occupational activities to ascertain the effects of different psychosocial stimuli on the relationships among the variables. Univariately, urinary MHPG did not relate to physical fitness and was moderately related to depression (p less than or equal to 0.10) during the occupational period. Multivariate canonical correlational results revealed a significant (p less than or equal to 0.04) relationship between the biochemical and personality sets of variables during the occupational settings. MHPG was the most sensitive catecholamine metabolite for reflecting depressive conditions. The results suggest a biochemical reactivity syndrome involving MHPG that may relate to depressive personality characteristics.

Adult↗