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MEDICINA DELLO SPORT

A Journal on Sports Medicine


Official Journal of the Italian Sports Medicine Federation
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Medicina dello Sport 1999 December;52(4):235-41

language: English

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)


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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.

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