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Int J Obes (Lond). 2007 Jan;31(1):131-7. Epub 2006 May 2.

Energy expenditure of genuine laughter.

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  • 1Department of Medicine, Vanderbilt University, Nashville, TN, USA. maciej.buchowski@vanderbilt.edu



To measure energy expenditure (EE) and heart rate (HR) during genuine laughter.


Experimental trial of viewing film clips in four cycles either intended to evoke laughter (humorous -10 min) or unlikely to elicit laughter (not humorous -5 min) under strictly controlled conditions of a whole-room indirect calorimeter equipped with audio recording system.


Forty five adult friend dyads in either same-sex male (n=7), same-sex female (n=21) and mix-sex male-female (n=17); age 18-34 years; body mass index 24.7+/-4.9 (range 17.9-41.1).


Energy expenditure in a whole-room indirect calorimeter, HR using Polar HR monitor. Laugh rate, duration and type from digitized audio data using a computerized system and synchronized with HR and EE results.


Laughter EE was 0.79+/-1.30 kJ/min (0.19+/-0.31 kcal/min) higher than resting EE (P<0.001, 95% confidence interval=0.75-0.88 kJ/min), ranging from -2.52 to 9.67 kJ/min (-0.60-2.31 kcal/min). Heart rate during laughter segments increased above resting by 2.1+/-3.8 beats/min, ranging from -7.6 to 26.8 beats/min. Laughter EE was correlated with HR (r (s)=0.250, P<0.01). Both laughter EE and HR were positively correlated with laughter duration (r (s)=0.282 and 0.337, both P<0.001) and rate (r(s)=0.256 and 0.298, both P<0.001).


Genuine voiced laughter causes a 10-20% increase in EE and HR above resting values, which means that 10-15 min of laughter per day could increase total EE by 40-170 kJ (10-40 kcal).

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