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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
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Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

The Journal of Sports Medicine and Physical Fitness 2000 Settembre;40(3):217-22

 ORIGINAL ARTICLES

Energy ­cost and car­di­o­res­pir­a­to­ry ­demands of nun­cha­ku exer­cise

Heller J.

Biomedical Laboratory, Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic

Background. The pur­pose was to exam­ine the ener­gy ­cost and car­di­o­res­pir­a­to­ry ­demands of nun­cha­ku exer­cise, one of the mar­tial ­arts per­formed ­with an instru­ment.
Methods. Nine ­male mar­tial art prac­ti­tion­ers (age 26.4 (±SD) 3.4 ­years, .VO2max 54.1±9.0 ml.kg-1.min-1) com­plet­ed ­three nun­cha­ku exer­cise ­trials, last­ing 20 sec, 1 min and 5 min. Cardiorespiratory ­response was fol­lowed by the Cosmed K4 port­able res­pir­a­to­ry anal­y­sis ­system. Measures: Oxygen con­sump­tion (.VO2) was deter­mined dur­ing pre­-ex­er­cise ­rest, the exer­cise peri­od and the recov­ery ­phase (10-15 min), and ener­gy ­release ­from lac­tate (La) pro­duc­tion was cal­cu­lat­ed assum­ing ­that an ­increase of 1 ­mmol.l-1 cor­re­sponds to a .VO2 of 3 ml O2 (di Prampero 1981).
Results. The over­all ener­gy ­cost of nun­cha­ku exer­cise ­attained 76±16 kJ (229±48 kJ.min-1), 98±23 kJ and 271±72 kJ (54±14 kJ.min-1) for the 20 sec, 1 min and 5 min nun­cha­ku exer­cise, respec­tive­ly. From the ­point of ­view of the ener­gy sourc­es (alac­tic, lac­tic and oxi­da­tive), 20-sec per­for­mance was essen­tial­ly ”anaer­o­bic alac­tic” (69:15:16%), 1 min exer­cise “alac­tic-oxi­da­tive” (49:16:35%) and 5-min per­for­mance an “oxi­da­tive” exer­cise work­load (17% alac­tic: 6% lac­tic: 77% oxi­da­tive, respec­tive­ly). The inten­sity of the exer­cise, on the aver­age, cor­re­spond­ed to 43, 49 and 56% of .VO2max and 69, 72 and 76% of HRmax, for the 20 sec, 1 min and 5 min exer­cis­es, respec­tive­ly.
Conclusions. Nunchaku exer­cise elic­its ­high alac­tic and oxi­da­tive ener­gy sourc­es, but its ­demand for anaer­o­bic gly­co­lyt­ic path­way ­seem to be rel­a­tive­ly low, regard­less the dura­tion of the exer­cise. The ener­gy ­cost (EC) for 20-sec to 5-min last­ing exer­cise may be ­described by pow­er func­tion EC=10.84.t-0.522 (n=24, r2=0.95), ­where EC is in kJ.min-1.kg-1 and t in sec­onds.

lingua: Inglese


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