The relationship between running velocity and the energy cost of turning during running

Ball game players frequently perform changes of direction (CODs) while running; however, there has been little research on the physiological impact of CODs. In particular, the effect of running velocity on the physiological and energy demands of CODs while running has not been clearly determined. Th...

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Bibliographic Details
Published in:PloS one 2014-01, Vol.9 (1), p.e81850-e81850
Main Authors: Hatamoto, Yoichi, Yamada, Yosuke, Sagayama, Hiroyuki, Higaki, Yasuki, Kiyonaga, Akira, Tanaka, Hiroaki
Format: Article
Language:English
Subjects:
Adolescent
Basketball
Biology
Chemical oxygen demand
Colleges & universities
Computer Simulation
Data points
Energy
Energy expenditure
Energy measurement
Energy Metabolism - physiology
Exercise
Exercise - physiology
Heart rate
Humans
Male
Medicine
Models, Biological
Oxygen
Oxygen consumption
Oxygen Consumption - physiology
Physical Education and Training - methods
Physical fitness
Physics
Physiological effects
Physiology
Quadratic equations
Running
Running - physiology
Science
Soccer
Sports - physiology
Studies
Time Factors
Velocity
Young Adult
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Summary:Ball game players frequently perform changes of direction (CODs) while running; however, there has been little research on the physiological impact of CODs. In particular, the effect of running velocity on the physiological and energy demands of CODs while running has not been clearly determined. The purpose of this study was to examine the relationship between running velocity and the energy cost of a 180°COD and to quantify the energy cost of a 180°COD. Nine male university students (aged 18-22 years) participated in the study. Five shuttle trials were performed in which the subjects were required to run at different velocities (3, 4, 5, 6, 7, and 8 km/h). Each trial consisted of four stages with different turn frequencies (13, 18, 24 and 30 per minute), and each stage lasted 3 minutes. Oxygen consumption was measured during the trial. The energy cost of a COD significantly increased with running velocity (except between 7 and 8 km/h, p = 0.110). The relationship between running velocity and the energy cost of a 180°COD is best represented by a quadratic function (y = -0.012+0.066x +0.008x(2), [r = 0.994, p = 0.001]), but is also well represented by a linear (y = -0.228+0.152x, [r = 0.991, p
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0081850