The effect of a single-circuit weight-training session on the blood biochemistry of untrained university students

Abstract

The metabolic and hormonal responses to an intensive single-circuit weight-training session were studied in 15 untrained male students. The training programme consisted of ten exercises, employing all the large groups of muscles. Students performed three circuits using a work-to-rest ratio of 30 s:30 s at 70% of one-repetition maximum. The whole programme lasted 30 min. Blood samples were obtained from the anticubital vein 30 min before exercise, immediately after exercise finished and after 1-h, 6-h, and 24-h periods of recovery. The training session produced significant increases in the plasma adrenocorticotropic hormone, cortisol, aldosterone, testosterone, progesterone and somatotropin concentrations. The plasma level of insulin and C-peptide remained unchanged. The strength exercises caused elevated ratios of cortisol:testosterone and cortisol:insulin, indicating a prevalence of stimulation of catabolic processes as well as of mobilization of energy reserves but during the recovery period the reverse of this was observed. Immediately after exercise the mean lactate concentration was 7.19 mmol.l-1, SD 0.56, the glucose concentration increased significantly during exercise and decreased rapidly during recovery. The high density lipoprotein-cholesterol increased in 1-h period of recovery compared with the initial level. The concentration of total cholesterol, low density lipoprotein-cholesterol and triglyceride, did not change. Packed cell volume did not change during exercise or recovery.

Ghrelin and glucoregulatory hormone responses to a single circuit resistance exercise in male college students

“…It seems that glucose feeding or insulin injection before or immediately after exercise would have altered these results (unpublished data). Our results demonstrated a significant increase in c-peptide due to a circuit resistance exercise, in contrast to the previous studies [24,34,54]. These conflicting data may be explained by initial levels of c-peptide [55], methodology, mode, duration, and intensity of exercise [56].…”

“…In this regard, our results showed no change in cortisol concentrations immediately after exercise and following 24 h of recovery. Previous studies have shown that heavy resistance exercise produces elevation in plasma cortisol [34][35][36][37].…”

Effect of Eight Weeks of Wrestling and Circuit Fitness Training on APO Lipoprotein A-I and Lymphocyte ABCA1 Gene Expression in Well-Trained Wrestlers

“…They reported results showed that LDL-C, and HDL-C concentrations remained unchanged immediately after exercise, but an elevation in plasma HDL-C observed after 1h of recovery period [28]. There is little doubt that ABCA1 interacts directly with ApoA-I.…”

Effects of Calcium Supplementation on Glucose and Insulin Levels of Athletes at Rest and After Exercise

“…It was determined that insulin hormone level of the subjects before aerobic exercise was 7.72 micIU/ml whereas it decreased to 4.42 after the exercise [3]. Plasma hormone levels were measured by drawing blood samples before, just after, and 1, 6, and 24 h after the study which contained ten different moves with 70% loading and decrease in insulin levels occurred [6]. It has been reported that supervised decrement exercise can effectively slow the progress of obesity and improve insulin sensitivity and metabolic risk factors [7].…”

“…It has been reported that insulin hormone level of the subjects decrease after exercise [3]. Jurimae et al [6] applied 30-min exercise using a work-to-rest ratio of 30:30 s on 15 untrained subjects. Plasma hormone levels were measured by drawing samples before, just after, and 1, 6, and 24 h after the study which contained ten different moves with 70% loading and decrease in insulin levels occurred.…”