Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
EXTERNAL LOADING DOES NOT CHANGE ENERGY-COST AND MECHANICS OF ROLLERSKI SKATING
Autore:
MILLET G; PERREY S; CANDAU R; BELLI A; BORRANI F; ROUILLON JD;
Indirizzi:
LAB SCI SPORT,UNITE FORMAT & RECH SCI & TECH ACTIV PHYS & SPORT,PL STJACQUES F-25030 BESANCON FRANCE
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 3, volume: 78, anno: 1998,
pagine: 276 - 282
SICI:
0301-5548(1998)78:3<276:ELDNCE>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHYSIOLOGICAL-RESPONSES; SKIING TECHNIQUES; DIAGONAL STRIDE; EFFICIENCY; EXERCISE; MEN; PERFORMANCE; BOYS;
Keywords:
SKI SKATING; ENERGY COST; EXTERNAL LOADING; STRETCH-SHORTENING CYCLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
G. Millet et al., "EXTERNAL LOADING DOES NOT CHANGE ENERGY-COST AND MECHANICS OF ROLLERSKI SKATING", European journal of applied physiology and occupational physiology, 78(3), 1998, pp. 276-282

Abstract

The purpose of this study was to examine the effects of external loading on the energy cost and mechanics of roller ski skating. A group of13 highly skilled male cross-country skiers roller skied at 19.0 ( SD0.1) km.h(-1) without additional load and with loads of 6% and 12% body mass (m(b)). Oxygen uptake ((V) over dot O-2). knee and ankle jointkinematics, roller-ski electromyogram (EMG) of the vastus lateralis and gastrocnemius lateralis muscles. and roller ski velocity were recorded during the last 40 s of each 4-min period of roller skiing. One-way repeated measures ANOVA revealed that the (V) over dot O-2 expressedrelative to total mass (m(tot)), joint kinetics, eccentric-to-concentric ratio of the integrated EMG, velocity changes within a cycle, and cycle rate did not change significantly with load. The subsequent analysis of the effect of load on each resistance opposing motion suggested that the power to sustain changes in translational kinetic energy, potential energy, and overcoming rolling resistance increased proportionately with the load. The lack of a significant change in (V) over dotO-2/m(tot) With external loading was associated with a lack of markedchange in external mechanical power relative to m(tot). The existenceof an EMG signal during the eccentric phase prior to the thrust (concentric phase), as well as the lack of significant delay between the two phases, showed that a stretch-shortening cycle (SSC) occurs in roller ski skating. Taken together, the present results would suggest that external loading up to 12% m(b) does not increase storage and release of elastic energy of lower limb muscles during SSC in roller ski skating.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 18:52:52