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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport

Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111

Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

The Journal of Sports Medicine and Physical Fitness 2000 Giugno;40(2):110-7

 Original articles

Cross transfer effects of muscular endurance during training and detraining

Yuza N., Ishida K. *, Miyamura M. *

From the Laboratory of Exercise Physiology Junior College Division of Chukyo Women’s University, Obu, Aichi, Japan
* Research Center of Health Physical Fitness and Sports Nagoya University, Nagoya, Aichi, Japan

Background. To clar­i­fy 1) how the ­cross-trans­fer ­effect, ­obtained in a con­tra­lat­er­al ­untrained fore­arm ­through a 4-week ipsi­lat­er­al endu­rance train­ing reg­i­men, is ­changed dur­ing detrain­ing; and 2) how ­blood ­flow to the ­untrained ­limb is relat­ed to the trans­fer ­effect of mus­cu­lar endu­rance dur­ing train­ing and detrain­ing peri­ods.
Methods. Training reg­i­men: hand-­grip train­ing by ­means of a ­hand-ergom­e­ter ­with a ­work-­load of 1/3 of the max­i­mum ­hand-­grip ­strength 5 ­times a ­week for 4 ­weeks. Blood ­flow: a mer­cu­ry-in-rub­ber ­strain-­gauge for ­venous occlu­sion ple­thys­mog­ra­phy.
Measures: 1) maximal num­ber of con­trac­tions to deter­mine the mus­cu­lar endu­rance; 2) reac­tive hyper­aem­ic ­blood ­flow ­response (­RHBF3) to deter­mine wheth­er max­i­mal vas­o­dil­a­to­ry capac­ity ­would be ­changed in ­both the fore­arms ­post-train­ing and detrain­ing; and 3) max­i­mal ­work-relat­ed ­blood ­flow.
Results. We ­found sig­nif­i­cant incre­ments ­both in the mus­cle endu­rance and the max­i­mal ­work-relat­ed ­blood ­flow not ­only in the ­trained (+125%, +30%) but ­also in the ­untrained (+40%, +19%) fore­arms. During detrain­ing, we ­found decreas­es ­both in the mus­cle endu­rance and the max­i­mal ­work-relat­ed ­blood ­flow (-22%, p<0.01; -16%, p=0.053) of the ­trained fore­arm. However, in the ­untrained arm (-3%, NS) the ­cross-trans­fer ­effect of mus­cu­lar endu­rance ­remained ­unchanged ­despite a ­drop in the max­i­mal ­work-relat­ed ­blood ­flow (-17%, p<0.05). The ­RHBF3 did not ­change in ­either of the fore­arms dur­ing the ­whole peri­ods.
Conclusions. These find­ings sug­gest ­that the main­te­nance of the ­cross trans­fer ­effect of mus­cle endu­rance dur­ing detrain­ing can­not be ­explained on the ­basis of chang­es in fore­arm ­blood ­flow.

lingua: Inglese


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