PMID- 17023010
OWN - NLM
STAT- MEDLINE
DCOM- 20070222
LR  - 20081121
IS  - 0031-9384 (Print)
IS  - 0031-9384 (Linking)
VI  - 90
IP  - 1
DP  - 2007 Jan 30
TI  - Acute effects of knowledge-based work on feeding behavior and energy intake.
PG  - 66-72
AB  - The aim of this study was to evaluate the impact of knowledge-based work (KBW) on 
      feeding behavior and spontaneous energy intake with the use of a repeated 
      measures/within-subjects design. We used a two-session protocol including an ad 
      libitum buffet preceded by either rest in a sitting position for 45 min or a 
      cognitive task (reading a document and writing a summary of 350 words using a 
      computer) over the same time period. In this regard, 15 healthy Laval University 
      female students (mean age = 24.1+/-2.2 years, mean BMI = 24.0+/-4.3 kg/m2) were 
      recruited to participate in this study. Anthropometric variables, energy 
      expenditure, heart rate, blood pressure, food intake (dietary record), and 
      appetite sensation markers were measured at each testing session, and two 
      questionnaires [Three-Factor Eating Questionnaire (TFEQ) and State-Trait Anxiety 
      Inventory (STAI)] were administered. In addition, a buffet-type meal was used to 
      measure spontaneous energy intake and macronutrient preferences. We found that 
      the mean energy expenditure of the two conditions was about comparable 
      (difference of 13 kJ between the two tasks) whereas the mean ad libitum energy 
      intake after the KBW task exceeded that measured after rest by 959 kJ (p < 0.01). 
      Although a higher absolute energy intake was observed for the three 
      macronutrients after the KBW task (p < 0.05), no specific preference was 
      detected, as reflected by the comparable percent of energy from each 
      macronutrient in the two conditions. No significant difference in appetite 
      sensation markers was observed between the two conditions, although the subjects 
      ate more in the buffet-type meal after the KBW task. Furthermore, the subjects 
      did not compensate by decreasing food intake for the rest of the day, suggesting 
      a net caloric surplus. We also observed negative correlations between cognitive 
      dietary restraint (TFEQ) and spontaneous energy intake in both conditions. In 
      conclusion, our results demonstrate that mental work solicited by KBW has the 
      potential to induce a higher spontaneous energy intake. This also raises the 
      possibility that KBW adds a new component to sedentariness that might further 
      accentuate the positive energy balance that is more likely to occur when one is 
      inactive.
FAU - Chaput, Jean-Philippe
AU  - Chaput JP
AD  - Division of Kinesiology (PEPS), Department of Social and Preventive Medicine, 
      Faculty of Medicine, Laval University, Sainte-Foy, Quebec, Canada G1K 7P4.
FAU - Tremblay, Angelo
AU  - Tremblay A
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20061003
PL  - United States
TA  - Physiol Behav
JT  - Physiology & behavior
JID - 0151504
SB  - IM
MH  - Adult
MH  - Analysis of Variance
MH  - Appetite/*physiology
MH  - Cognition/*physiology
MH  - Energy Intake/*physiology
MH  - Energy Metabolism/physiology
MH  - Feeding Behavior/*physiology/psychology
MH  - Female
MH  - Humans
MH  - Physical Exertion/physiology
MH  - Problem Solving/physiology
MH  - Reference Values
MH  - Single-Blind Method
MH  - Statistics, Nonparametric
MH  - Thinking/*physiology
MH  - Work/*physiology/psychology
EDAT- 2006/10/07 09:00
MHDA- 2007/02/23 09:00
CRDT- 2006/10/07 09:00
PHST- 2006/04/07 00:00 [received]
PHST- 2006/08/03 00:00 [revised]
PHST- 2006/08/28 00:00 [accepted]
PHST- 2006/10/07 09:00 [pubmed]
PHST- 2007/02/23 09:00 [medline]
PHST- 2006/10/07 09:00 [entrez]
AID - S0031-9384(06)00383-0 [pii]
AID - 10.1016/j.physbeh.2006.08.030 [doi]
PST - ppublish
SO  - Physiol Behav. 2007 Jan 30;90(1):66-72. doi: 10.1016/j.physbeh.2006.08.030. Epub 
      2006 Oct 3.