Vol.1, No 9, 2002 pp. 27 - 35
UDC 796.421
Scientific Paper
ENERGETICS AND PERCEIVED EXERTION
OF LOW SPEED RUNNING AND HIGH SPEED WALKING
Alan Hreljac, Daryl Parker, Roberto Quintana,
Estelle Abdala, Kyle Patterson, Mitell Sison
California State University, Kinesiology and Health Science Department,
Sacramento, United States
E-mail: ahreljac@hhs4.hhs.csus.edu
Abstract.The primary purpose of this study was to determine whether the relationship between energetic consumption and speed during low speed running fit a quadratic or linear model better, and to determine the effect of model choice on the energetically optimal transition speed (EOTS).  Subjects walked and ran on a treadmill at speeds ranging from 60% to 120% of their preferred transition speed (PTS) while   and RPE data were collected.  A quadratic model fit the energy data better than a linear model for walking (r2 = 1.00) and running (r2 = 0.94).  Neither model was superior in fitting RPE data to speed during walking and running.  The EOTS occurred at 110% of the PTS (2.20 ms-1), close to the EOTS found using a linear model.  At low running speeds, a quadratic model for energy-speed data is superior to a linear model, although model choice has little effect on the determination of EOTS.
Key words: metabolic cost, gait transition, human locomotion
ENERGETIKA I OPAŽANJE  NAPREZANJA
KOD SPOROG TRČANJA I BRZOG HODANJA
Osnovni cilj ove studije bio je da se utvrdi da li odnos izmedju energetske potrošnje i brzine tokom trčanja sporim tempom više odgovara kvadratnom ili linearnom modelu i da se utvrdi efekat izbora modela na energetski optimalnu tranzicionu brzinu (EOTS). Ispitanici su hodali i trčali na tredmilu  brzinom koja se kretala od 60% do 120% njihove poželjne tranzicione brzine (PTS), pri čemu su prikupljani početni podaci za   i RPE. Pronađeno je da kvadratni model više odgovara podacima za utrošenu energiju nego linearni model za hodanje (r2=1,00) i trčanje (r2=0,94). Ni jedan model se nije pokazao superiornijim u odnosu na RPE podatke tokom hodanja i trčanja. EOTS se pojavljuje u 110% vrednosti PTS (2,20ms-1), a vrlo blizu EOTS podacima za linearni model. Za male brzine trčanja, kvadratni model za odnos energija-brzina jeste superiorniji u odnosu na linearni model, iako izbor modela ima malo uticaja na određivanje EOTS-a.
Ključne reči: metabolički utrošak, tranzicija hodanja, ljudsko pokretanje