Title

Warm-Up Affects Diurnal Variation in Power Output

Document Type

Journal Article

Publisher

Georg Thieme Verlag

Faculty

Faculty of Computing, Health and Science

School

School of Exercise and Health Sciences

RAS ID

12396

Comments

This article was originally published as: Taylor, K. , Cronin, J. B., Gill, N., Chapman, D. W., & Sheppard, J. M. (2011). Warm-up affects diurnal variation in power output. International Journal of Sports Medicine, 32(3), 185-189. Original article available here

Abstract

The purpose of this study was to examine whether time of day variations in power output can be accounted for by the diurnal fluctuations existent in body temperature. 8 recreationally trained males (29.8±5.2 yrs; 178.3±5.2 cm; 80.3±6.5 kg) were assessed on 4 occasions following a: (a) control warm-up at 8.00 am; (b) control warm-up at 4.00 pm; (c) extended warm-up at 8.00 am; and, (d) extended warm-up at 4.00 pm. The control warm-up consisted of dynamic exercises and practice jumps. The extended warm-up incorporated a 20 min general warm-up on a stationary bike prior to completion of the control warm-up, resulting in a whole body temperature increase of 0.3±0.2°C. Kinetic and kinematic variables were measured using a linear optical encoder attached to a barbell during 6 loaded counter-movement jumps. Results were 2-6% higher in the afternoon control condition than morning control condition. No substantial performance differences were observed between the extended morning condition and afternoon control condition where body temperatures were similar. Results indicate that diurnal variation in whole body temperature may explain diurnal performance differences in explosive power output and associated variables. It is suggested that warm-up protocols designed to increase body temperature are beneficial in reducing diurnal differences in jump performance.

DOI

10.1055/s-0030-1268437

 

Link to publisher version (DOI)

10.1055/s-0030-1268437