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MEDICINA DELLO SPORT
A Journal on Sports Medicine
Official Journal of the Italian Sports Medicine Federation
Indexed/Abstracted in: BIOSIS Previews, EMBASE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 0,163
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Medicina dello Sport 1999 December;52(4):235-41
Hormone levels following leg press exercise at an individual physical working capacity in male students
Jurimae T., Jurimae J., Leppik A.
Institute of Sport Pedagogy, University of Tartu, Tartu (Estonia)
The aim of the present study was to investigate the usefulness of maximal duration leg press exercise at an individual physical working capacity (PWC) level during sport practice or recreational purposes in male physical education students (n=18). Firstly, individual PWC was measured using a cycle ergometer test. Three progressive workloads (150, 200 and 250 W) for a period of four minutes were used. Individual PWC was calculated by extrapolation at the level of predicted HRmax (205 - 1/2 age). Secondly, an individual PWC of two-legged leg press exercise was determined similarly to the cycle ergometer test. The loads were 30, 45 and 60% of individual 1 repetition maximum for a period of 4 minutes and subjects performed 15 repetitions per minute. After 3 days of rest, leg press exercise for maximal duration was performed at an individual PWC (15 repetitions per minute). Venous blood samples were obtained 3 minutes before and immediately after the test. Testosterone, cortisol (C), sex-hormone-binding-globuline, glucose (GL) and lactate (LA) concentrations were measured. Significant correlation between PWC values of both tests was found (r=0.70). Mean leg press exercise duration and HR were 450.2±99.1 sec and 137.4±14.2 beats·min-1, respectively. Only LA (from 1.92±0.91 to 7.62±2.83 mmol·l-1) and C (from 388.83±138.12 to 470.72±155.06 nmol·l-1) concentrations in blood were significantly increased, and the concentration of GL decreased (from 5.25±0.80 to 4.54±0.84 mmol·l-1). In summary, the relatively short leg press exercise at an individual PWC level only moderately influenced the blood anabolic/catabolic ratio. However, the addition of HR measure and the use of calculated PWC in leg press exercise during sport practice or recreational purposes needs more investigations before any conclusions can be drawn.