Thursday-Abstracts

Official Journal of the American College of Sports Medicine
LR trial during both exercise (141.1 ± 20.1 vs. 124.0 ± 15.9 b•min-1, p < 0.05) and
recovery (81.6 ± 10.7 vs. 68.3 ± 6.0 b•min-1, p < 0.05).
CONCLusION: A decrease in RI during moderate intensity RE resulted in a twofold
decrease in exercise time and a significant increase in post-exercise VO2 and energy
expenditure. When body mass management is the primary goal of RE, short RI may
optimize calorie expenditure and while conserving time.
1133 Board #78 May 30, 9:00 AM - 10:30 AM
Effects Of high Intensity Intermittent Exercise On Postexercise
resting Oxygen Consumption
Katsunori Tsuji, Xin Liu, Yu Zhong Xu, Izumi Tabata, FACSM.
Ritsumeikan University, Kusatsu, Japan. (Sponsor: Izumi Tabata,
FACSM)
(No relationships reported)
PurPOsE:The purpose of the present investigation is to elucidate the effects of
short-lasting high intensity intermittent exercise on post-exercise resting oxygen
consumption.
METhOds:Seven young healthy males volunteered for the experiment. Means ±
standard deviations (SDs) of the subjects’ age (yrs), height (m), body mass (kg), and
V(●)O2 max (ml/kg/min) were 24±1, 1.72±0.05, 65.9±6.5, and 46.4±1.6, respectively.
For the exercise (E) day, the subjects entered the metabolic chamber at 10:00. After
10 min of warming up, the subjects conducted exhaustive high-intensity intermittent
exercise (6 to 7 sets of 20-s exercise at an intensity of 170% V(•)O 2max with a 10-s rest
between each bout). After the exercise, the subjects stayed in the metabolic chamber
to the next morning. They consumed lunch and supper at fixed time of the day. For
control (C) day, the subjects followed the same protocol, except for the HIIE. The
order of the exercise and the control experiment were randomly assigned for each
subject.
rEsuLTs:Basal oxygen consumption measured in the morning before the subjects
entered the chamber was not different between E and C day. After HIIE, oxygen
consumption was continuously higher than that observed for C day. The difference
in oxygen uptake between E day and C day (246±72 ml/kg/12hour) was positively
correlated with accumulated oxygen uptake during the exercise (121±15 ml/kg, r=0.82,
p0.10). These results may suggest that elevated oxygen uptake after high intensity
intermittent exercise does not necessarily represent energy needs for resynthesis of
anaerobic energy substrates (i.e. creatine phosphate and glycogen). Even after adding
energy consumption during the HIIE, the total difference in energy expenditure
between E and C day was 121±28 kcal.
CONCLusIONs:Short-lasting high intensity intermittent exercise may elevate
resting energy consumption. However, its quantitative contribution to weight-reduction
is limited.
1134 Board #79 May 30, 9:00 AM - 10:30 AM
Nighttime Consumption of Protein or Carbohydrate
Improves Morning resting Energy Expenditure in active
College-aged Men
Amber W. Kinsey, Takudzwa A. Madzima, Lynn B. Panton,
FACSM, Sarah K. Fretti, Michael J. Ormsbee. Florida State
University, Tallahassee, FL.
(No relationships reported)
Nighttime eating is an unexplored component of nutrient timing and no data exist
regarding the satiating and metabolic effects of macronutrients consumed at night
before sleep.
PurPOsE: To investigate whether whey protein (WP), casein protein (CP),
carbohydrate (CHO), or a non-caloric placebo (PLA) consumed prior to sleep alters
morning appetite and resting energy expenditure (REE) in active men.
METhOds: Eleven physically active men (age, 23.6 ± 3.1 years; body fat, 16.3 ±
8.2%) participated in this randomized, double blind, crossover study. A single dose of
WP (30g), CP (30g), CHO (33g) or PLA was consumed 30 minutes prior to sleep and
each trial was separated by 48-72 hours. The next morning (0500-0800), measurements
of satiety, hunger, and desire to eat (visual analog scale) and REE (indirect calorimetry)
were performed. After a 30 minute equilibration period, 60 minutes of REE in the
supine position was measured. Ten-minute means (total of 5) over the final 50 minutes
of measurement were analyzed. Outcome variables were oxygen consumption (VO2),
REE, and respiratory quotient (RQ). Statistical analyses were conducted using a 4 x
5 (group x time) repeated measures ANOVA for metabolic variables and a one way
ANOVA was used for changes in appetite markers. Group differences were examined
by Tukey post-hoc analyses. Data are reported as mean ± SE.
rEsuLTs: There were no significant differences in appetite measures among or
between groups. There were no group x time interactions for VO2, REE, and RQ;
however there was a main effect for group. VO2 was significantly greater for WP
(3.35 ± 0.03 ml/kg/min) and CP (3.30 ± 0.03 ml/kg/min, p < 0.0001) when compared
to PLA (3.16 ± 0.03 ml/kg/min), but not CHO (3.25 ± 0.03 ml/kg/min). Predicted
REE was significantly greater after WP (1947 ± 16 kcal/d), CP (1941 ± 16 kcal/d)
and CHO (1908 ± 16 kcal/d) compared to PLA (1843 ± 16 kcal/d, p < 0.0001). RQ
was significantly lower after PLA (0.759 ± 0.003) compared to WP (0.773 ± 0.003)
Vol. 45 No. 5 Supplement S211
and CHO (0.773 ± 0.003, p < 0.0001) but not CP (0.764 ± 0.003). There were no
significant differences between WP and CP in any metabolic measurements.
CONCLusION: Nighttime consumption of WP, CP, or CHO, in close proximity to
sleep, elicits favorable effects on next morning metabolism when compared to a noncaloric
PLA in active young men.
1135 Board #80 May 30, 9:00 AM - 10:30 AM
Total Energy Expenditure approaches 4 xBMr in
septuagenarians during the race across america (raaM)
Brent C. Ruby, FACSM 1 , Nate Keck 1 , Tim Shriver 2 , Dale
Schoeller 2 . 1 University of Montana, Missoula, MT. 2 The
University of Wisconsin - Madison, Madison, WI.
(No relationships reported)
Previous data has demonstrated that riders in the Tour de France maintain a physical
activity level (PAL) between 3.5-5.5 times basal metabolic rate (xBMR) (Westerterp et
al., 1986). In contrast, the PAL for male septuagenarians has been reported to average
1.7 xBMR (Manini et al., 2009).
PurPOsE: To measure the total energy expenditure (TEE) and water turnover in a
4-man team of septuagenarians during the Race Across America (RAAM).
METhOds: Study participants included four males (70±1.6 yrs, 72.0±5.1kg)
competing as a team during the 2012 RAAM bicycle event (4817 km). Participants
were provided with an oral dose of doubly labeled water after a background urine
sample late in the evening the night before the start. Early the following morning,
a second void urine sample was collected in parallel with a measure of nude body
weight. Subsequent urine samples and body weights were collected on the third
and fifth morning and upon completion of the event to analyze values across three
segments of the race.
rEsuLTs: The four man septuagenarian team finished in 6.55 days with an average
speed of 30.6 km/hr (age group course record). Body weight showed subtle changes
(71.6±6.1 and 70.2±6.5 kg for pre to post race, respectively). Total energy expenditure
averaged 24.8±4.2 MJ/day (5,936±995 kcal/day) (range = 19.16-30.24 MJ/day, 4,578-
7,230 kcal/day) throughout the continuous event. The range of TEE expressed relative
to basal metabolic rate was 2.9-4.0 xBMR. Water efflux averaged 10.5±1.4 L/day
resulting in an overall turnover amounting to 1.6±0.4 times initial total body water
(45.3±3.9 L).
CONCLusION: Highly active septuagenarians maintain near energy balance when
TEE approaches 4 xBMR. These values exceed twice those of less active, similarly
aged males and are comparable to riders during portions of the Tour de France.
1136 Board #81 May 30, 9:00 AM - 10:30 AM
Interactions between the Thermic Effect of Food and
Exercise on Total Energy Expenditure among Females
Ashley Binns, Michelle Gray. University of Arkansas,
Fayetteville, AR.
(No relationships reported)
It is well known that both diet and exercise are key components in overall maintenance
of optimal health. Exercise, in both aerobic and anaerobic forms contributes to overall
energy expenditure (TEE). Additionally, the thermic effect of food (TEF) has also been
recognized to impact energy expenditure.
PurPOsE: The aim of the present investigation was to determine the interaction
between TEF and exercise on total energy expenditure (TEE) based on protein content
of a meal in moderately active females.
METhOds: Twelve active females of normal body composition participated in the
study. Preliminary maximal aerobic capacity (VO2max) was determined. Participants
returned for three additional randomized testing sessions in which a 30-minute bout
of exercise was performed at 60% VO2max after consumption of a high protein (45%
total kcal), low protein (15% total kcal), or in the fasted state.
rEsuLTs: Repeated measures ANOVA indicated a significant main effect for the
feeding protocols (α = .05). The TEF of food was 30.39% greater in the high protein
meal when compared to the low protein meal (p = .006) and 98.15% greater when
compared to the fasted state (p = .000). Low protein meal consumption resulted in a
94.34% higher TEF when compared to the fasted state (p = .000). In combination with
exercise, the TEF of food with a high protein meal was significantly greater compared
to the fasted state (p = .010) but was not different compared to the low protein meal (p
= .122). No significant differences were found between low protein meal consumption
combined with exercise compared to the fasted state (p = .094).
CONCLusION: Findings of this study suggest an effect between protein content
of a meal, moderate-intensity exercise, TEF, and TEE. Acute bouts of high and low
protein feedings potentiated significant increases in energy expenditure through TEF.
In combination with exercise, a significant increase in TEE was only found with high
protein meal consumption when compared to the fasted state. Trends for increased TEF
with exercise were present for exercise performed after consumption of a low protein
meal compared to the high protein meal and the fasted state, though not statistically
significant.
Abstracts were prepared by the authors and printed as submitted.
Thursday, May 30, 2013