Thursday-Abstracts

Thursday, May 30, 2013
S336 Vol. 45 No. 5 Supplement
compared to 85% VO2max (2.54 ± 0.73 vs. 2.01 ± 0.45 ml min-1 mmHg-1, resp).
CVC increased (p 0.05) for both conditions. The amount of RMF was related (r=0.61; p 0.05)
between the ΔFEV1% pre-post exercise and %EFL at VO2max. However, in children
MEDICINE & SCIENCE IN SPORTS & EXERCISE ®
that demonstrated clinically relevant EIB (i.e.,>10% decrease in FEV1; n=22), there
was a significant relationship (r = 0.66, p < 0.05) between EIB and EFL. In study
two (n=16), with training, children improved pre-post exercise ΔFEV1% (pre:-7.60 ±
2.10%, post:-1.10 ± 1.80%, p < 0.05). There was an association between ΔFEV1% and
Δ%EFL from pre- to post-training (r = 0.77, p < 0.05) in the TRG only.
CONCLusION: These data suggest that pre-adolescent children who exhibit
clinically relevant EIB also demonstrate the most severe expiratory flow limitation
during exercise. With exercise training, reductions in EIB are associated with reduced
EFL. These findings may be important in prevention and treatment of exercise
intolerance in pre-adolescent children.
1746 Board #4 May 30, 3:15 PM - 5:15 PM
Peak Oxygen uptake differs Between Obese Women With
Vs. Without dyspnea On Exertion
J. Todd Bassett, Vipa Bernhardt, Santiago Lorenzo, Raksa
B. Moran, Sarah F. Haller, Jessica M. Pineda, Tony G. Babb,
FACSM. Institute for Exercise and Environmental Medicine,
Texas Health Presbyterian Hospital Dallas and University of
Texas Southwestern Medical Center, Dallas, TX.
(No relationships reported)
PurPOsE: During constant load exercise, some otherwise healthy obese women
experience dyspnea on exertion (+DOE), while others do not (-DOE). In previous
studies, we observed exercise capacity to be similar in -DOE and +DOE. We
questioned whether this would remain true if we sampled a larger number of obese
women.
METhOds: To investigate, we recruited 80 otherwise healthy obese women who
were divided into groups based on their Ratings of Perceived Breathlessness (RPB,
Borg 0-10 scale) at the end of 6 minutes of constant load cycling (60W), as in prior
studies. 24 women were designated as -DOE (RPB≤2, 32±8 yr, 37±4 BMI, mean±SD)
and 34 women were classified as +DOE (RPB≥4, 34±7 yr, 36±5 BMI). 22 women
with RPB=3 were excluded to better delineate the groups. Peak oxygen uptake was
determined during maximal incremental cycle ergometry. Data were analyzed between
groups by independent t-test. The relationship between variables was determined by
linear regression analysis.
rEsuLTs: While peak oxygen uptake was within normal limits in both groups,
exercise capacity (as % of predicted) was greater (p