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Original articles  ENDOCRINOLOGY

The Journal of Sports Medicine and Physical Fitness 2003 June;43(2):243-9

language: English

A single set of low intensity resistance exercise immediately following high intensity resistance exercise stimulates growth hormone secretion in men

Goto K. 1, Sato K. 2, Takamatsu K. 3

1 Doc­toral Pro­gram in ­Health and ­Sport Sci­ences
2 Doc­toral Pro­gram in ­Human ­Care Sci­ences
3 Insti­tute of ­Health and ­Sport Sci­ences, Uni­ver­sity of Tsu­kuba, Tsu­kuba, Iba­raki, ­Japan


Aim. The pur­pose of the ­present ­study was to ­examine the ­effects of an addi­tional set imme­di­ately fol­lowing ­high inten­sity resis­tance exer­cise on ­growth hor­mone (GH) ­response.
­Methods. Sub­jects (n=8) per­formed 4 resis­tance exer­cise pro­to­cols (bilat­eral ­knee exten­sion exer­cise) on sep­arate ­days. The pro­to­cols ­were cat­e­go­rized ­into 2 ­types of pro­tocol, ­namely “Strength-up ­type (S-­type)” and “Com­bi­na­tion ­type (­Combi-­type)”. The S-­type was resis­tance exer­cise ­which con­sisted of 5 ­sets at 90% of 1 rep­e­ti­tion max­imum (RM) ­with 3-min ­rest ­periods ­between ­sets, ­whereas the ­Combi-­type is a ­training pro­tocol ­which ­adds an addi­tional set (­either 50% of 1 RM [C50-­type], 70% of 1 RM [C70-­type] or 90% of 1 RM [C90-­type]) to the S-­type. ­Serum GH con­cen­tra­tion and ­blood lac­tate con­cen­tra­tion ­were deter­mined pre-­ex­er­cise and at 0-60 min post­ex­er­cise. Rel­a­tive ­changes in ­thigh ­girth and max­imal uni­lat­eral iso­metric ­strength ­were deter­mined pre­-ex­er­cise and imme­di­ately post­ex­er­cise.
­Results. The ­increasing ­values of GH con­cen­tra­tion (∆GH) in the S-­type was the ­lowest of all pro­to­cols. On the ­other ­hand, ∆GH in the C50-­type ­showed a sig­nif­i­cantly (p<0.05) ­higher ­increase ­than in the S-­type and C90-­type, and a rel­a­tively ­higher ­increase ­than in the C70-­type.
Con­clu­sion. ­These ­results sug­gests ­that a ­high inten­sity, low ­volume ­training pro­tocol to ­induce ­neural adap­ta­tion ­resulted in ­little GH ­response, but GH secre­tion was ­increased by per­forming a ­single set of low inten­sity resis­tance exer­cise at the end of a ­series of ­high inten­sity resis­tance ­sets.

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