INDIRECT CALORIMETRY DURING ULTRADISTANCE RUNNING: A CASE REPORT
Posted by planetultramarathon on December 14, 2006
FYI — Published today at:
http://www.jssm.org/vol5/n4/29/v5n4-29abst.php
Full text available. (re. WS100)
ABSTRACT=20
The purpose was to determine the energy expenditure during ultradistance
trail running. A portable metabolic unit was carried by a male subject =
for
the first 64.5 km portion of the Western States 100 running race.
Calibrations were done with known gases and volumes at ambient =
temperature,
humidity and pressure (23-40.5 =B0C and 16-40% respectively). Altitude
averaged 1692.8 =B1 210 m during data collection. The male subject (36 =
yrs, 75
kg, VO2max of 67.0 ml=B7kg-1=B7min-1) had an average (mean =B1 SD) heart =
rate of
132 =B1 9 bpm, oxygen consumption of 34.0 =B1 6.8 ml=B7kg-1=B7min-1, RER =
of 0.91 =B1
0.04, and VE of 86.0 =B1 14.3 L=B7min-1 during the 21.7 km measuring =
period.
This represented an average of 51% VO2max and 75% heart rate maximum. =
Energy
expenditure was 12.6 =B1 2.5 kcals=B7min-1, or 82.7 =B1 16.6 =
kcals=B7km-1 (134 =B1 27
kcals=B7mile-1) at 68.3 =B1 12.5% carbohydrate. Extrapolation of this =
data would
result in an energy expenditure of >13,000 kcals for the 160 km race, =
and an
exogenous carbohydrate requirement of >250 kcal=B7hr-1. The energy cost =
of
running for this subject on separate, noncompetitive occasions ranged =
from
64.9 =B1 8.5 to 74.4 =B1 5.5 kcals=B7km-1 (105 =B1 14 to 120 =B1 9 =
kcals=B7mile-1).
Ultradistance trail running increases energy expenditure above that of
running on nonundulating terrain, which may result in underestimating =
energy
requirements during these events and subsequent undernourishment and
suboptimal performance
=A0=20
Anthony C. =93Woofie=94 Humpage, CSCS
USA Triathlon Level 1 Certified Coach
A Joe Friel=92s ULTRAFIT Associate
MASTERS ATHLETIC PERFORMANCE
