Long term effects of peak strenuous effort on serum magnesium, lipids, and blood sugar in apparently healthy young men.
Earlier findings showed a sustained lowering of serum magnesium concentration (S-Mg) which indicated the presence of Mg deficit, and a parallel, delayed rise of blood sugar and serum lipids as a sequel to strenuous effort. S-Mg was still significantly decreased 3 months after termination of peak effort. To gain further perspective, we followed the biochemical sequels of exertion over an extended period of observation, while maintaining the same experimental conditions used earlier, which mimicked those employed in the training of military recruits. We examined two groups of military recruits, n = 15 (group 1), n = 16 (group 2), mean age 18.6, SD 1.3 and 18.7, SD 0.6, years respectively, who underwent a graded training programme of 7 months' duration culminating in a 120 km forced march. Blood was sampled for estimation of S-Mg in 20 soldiers on recruitment, 6 and 10 months after the 120 km march in group 1, and 9, 11 and 15 months after the march in group 2. Blood sugar and serum lipids were screened on recruitment and up to 11 months after the 120 km march. A significant lowering of mean S-Mg was found as late as 10 months after completion of the march in group 1, and 11 months in group 2 (P less than 0.01). Mean serum cholesterol and triglycerides showed a delayed rise, especially in group 2 (P less than 0.05 and P less than 0.001, respectively), whereas blood sugar decreased in group 1, but increased in group 2 (P less than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
Stendig-Lindberg
G
G
Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv University, Israel.
Wacker
W E
WE
Shapiro
Y
Y
D000293:Adolescent; D000328:Adult; D001786:Blood Glucose / Q000378:metabolism*; D002784:Cholesterol / Q000097:blood; D006801:Humans; D008055:Lipids / Q000097:blood; D008274:Magnesium / Q000097:blood*; D008297:Male; D008889:Military Personnel; D010806:Physical Education and Training; D005082:Physical Exertion / Q000502:physiology*; D014280:Triglycerides / Q000097:blood
D001786:Blood Glucose; D008055:Lipids; D014280:Triglycerides; D002784:Cholesterol; D008274:Magnesium