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Original articles  ENDOCRINOLOGY

The Journal of Sports Medicine and Physical Fitness 2003 December;43(4):546-53

language: English

Effect of sprint duration (6 s or 30 s) on plasma glucose regulation in untrained male subjects

Moussa E. 1, 2, Zouhal H. 2, Vincent S. 2, Proiux J. 3, Delamarche P. 2, Gratas-Delamarche A. 2

1 Labor­a­tory of Phys­io­logy and ­Biomechanics of ­Exercice University of Bal­a­mand, Bal­a­mand, ­Lebanon
2 Labor­a­tory of Phys­io­logy and ­Biomechanics of Mus­cu­lar Exercise, UFR-APS University of ­Rennes II, ­Rennes, ­France
3 Labor­a­tory of Phys­io­logy and ­Exercice Psy­col­ogy UFR-­STAPS ­Nantes, ­Nantes, ­France

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Aim. We ­have ­explored in the fol­lowing ­study the glu­cor­e­gu­la­tory ­responses (gly­cemia, insu­li­nemia, cat­e­chol­a­mines) at the end of 2 supra­max­imal ­tests of dif­ferent dura­tions.
­Methods. ­Seven ­untrained ­male sub­jects (21.9±0.3 ­y) per­formed an iso­lated exer­cise of 6 s (T6) and a Win­gate-­test of 30 s. To deter­mine the ­levels of lac­tate (La), ­plasma con­cen­tra­tions of glu­cose, ­insulin, adren­a­line (A) and nor­a­dren­a­line (NA), ­blood sam­ples ­have ­been col­lected suc­ces­sively at ­rest, ­after a ­warm-up ­period of 15 min, imme­di­ately ­after T6 and T30, and ­after 5, 10, 20, and 30 min of ­recovery.
­Results. ­Whether ­expressed as abso­lute or rel­a­tive ­values, the ­peak ­power ­recorded ­during the 2 ­tests is sta­tis­ti­cally the ­same in T6 and T30. The max­imal ­value of lac­tate (­Lamax) meas­ured ­5 min­ ­after the end of the 2 exer­cises is sig­nif­i­cantly ­greater ­after T30 (12.3±0.9 ­mmol . L-1) ­than ­after T6 (5.4±0.4 ­mmol . L-1) and T30 (4.2±0.2 ­mmol . L-1). No sig­nif­i­cant dif­fer­ence is ­observed ­between the ­plasma glu­cose con­cen­tra­tions ­recorded ­after the 2 ­tests ­until the ­first 10 min of ­recovery. How­ever the ­plasma glu­cose ­values ­recorded ­after 20 and 30 min­ of ­recovery are sig­nif­i­cantly ­higher ­after T6 ­than ­after T30. What­ever the dura­tion of the ­test, the insu­li­nemia ­level ­remains ­unchanged at the end of the exer­cise and ­during the 30 min­ of ­recovery. On the ­other ­hand, the ­values of adren­a­line and nor­a­dren­a­line ­after T6 and T30 ­become con­sid­er­ably ­higher ­than ­those ­recorded at ­rest. How­ever, the ­increase ­remains sig­nif­i­cantly ­higher ­after T30 (13.5±1.8 ­nmol . L-1 for NA and 2.7±0.7 ­nmol . L-1 for A) ­than ­after T6 (4.9±0.3 ­nmol . L-1 for NA and 1.2±0.2 ­nmol . L-1 for A).
Con­clu­sion. ­These ­results sug­gest ­that the mech­a­nism respon­sible for ­increasing ­blood glu­cose sur­pass ­those ­which ­decrease it ­during supra­max­imal exer­cise. How­ever, ­plasma glu­cose con­cen­tra­tions is ­affected by the dura­tion of supra­max­imal exer­cise. The ­lower ­increase of ­plasma glu­cose con­cen­tra­tion ­after T30 ­than ­after T6 ­might be ­explained by the ­resting of ­muscle gly­cogen ­stores ­which are ­more ­used ­during T30 ­than ­after T6, but in the ­absence of ­muscle gly­cogen con­tent meas­ure­ment we ­cannot con­clude.

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