scholarly journals Intra-individual variation in resting metabolic rate during the menstrual cycle

2003 ◽  
Vol 89 (6) ◽  
pp. 811-817 ◽  
Author(s):  
C. Jeya K. Henry ◽  
Helen J. Lightowler ◽  
Jonathan Marchini
Keyword(s):  
Menstrual Cycle ◽  
Metabolic Rate ◽  
Individual Variation ◽  
Statistical Models ◽  
Significant Variation ◽  
Resting Metabolic Rate ◽  
Training Effect ◽  
Specific Level ◽  
Subject Specific ◽  
Consecutive Cycle

Little information exists on the extent of day-to-day intra-individual variation in resting metabolic rate (RMR) in women. The present study has investigated the intra-individual variation in RMR of women during the menstrual cycle. Nineteen women (naturally cycling non-pill users) were recruited to the study. Anthropometric and RMR measurements were taken at least three times per week for the duration of one complete menstrual cycle; measurements were taken for a second, consecutive cycle in eight of the nineteen subjects. RMR was measured by indirect calorimetry using a ventilated hood system under standardized conditions. The measurements made throughout each complete menstrual cycle were averaged and the levels of inter- and intra-individual variation in RMR were assessed by determining the CV (%). Mean RMR of the group was 5686 (SD 674) kJ/d; inter-individual variation in RMR was 11·8 %. There were wide differences in the intra-individual variation in RMR of women (CV range 1·7–10·4 %). The CV in ten subjects was small (2–4 %), while the CV in nine women was high (5–10 %), indicating a significant variation in RMR during the menstrual cycle in certain subjects. Using statistical models, it has been shown that there was a significant effect on RMR due to a subject-specific level of variability; this was the case even when accounting for a possible training effect. In conclusion, the findings from our present study show that RMR cannot be assumed to be ‘stable’ in all women. The implications of intra-individual variation in RMR and its impact on energy balance needs further research.

scholarly journals Metabolic rate associates with, but does not generate covariation between, behaviours in western stutter-trilling crickets, Gryllus integer

2017 ◽  
Vol 284 (1851) ◽  
pp. 20162481 ◽  
Author(s):  
Indrikis A. Krams ◽  
Petri T. Niemelä ◽  
Giedrius Trakimas ◽  
Ronalds Krams ◽  
Gordon M. Burghardt ◽  
...  
Keyword(s):  
Metabolic Rate ◽  
Covariance Matrix ◽  
Individual Variation ◽  
Structural Equation ◽  
Structural Equation Models ◽  
Resting Metabolic Rate ◽  
Individual Level ◽  
Two Generations ◽  
Fast Development ◽  
Gryllus Integer

The causes and consequences of among-individual variation and covariation in behaviours are of substantial interest to behavioural ecology, but the proximate mechanisms underpinning this (co)variation are still unclear. Previous research suggests metabolic rate as a potential proximate mechanism to explain behavioural covariation. We measured the resting metabolic rate (RMR), boldness and exploration in western stutter-trilling crickets, Gryllus integer , selected differentially for short and fast development over two generations. After applying mixed-effects models to reveal the sign of the covariation, we applied structural equation models to an individual-level covariance matrix to examine whether the RMR generates covariation between the measured behaviours. All traits showed among-individual variation and covariation: RMR and boldness were positively correlated, RMR and exploration were negatively correlated, and boldness and exploration were negatively correlated. However, the RMR was not a causal factor generating covariation between boldness and exploration. Instead, the covariation between all three traits was explained by another, unmeasured mechanism. The selection lines differed from each other in all measured traits and significantly affected the covariance matrix structure between the traits, suggesting that there is a genetic component in the trait integration. Our results emphasize that interpretations made solely from the correlation matrix might be misleading.

Estimates of metabolic adaptation in women living in developing countries: technical limitations

1992 ◽  
Vol 24 (3) ◽  
pp. 347-353 ◽  
Author(s):  
C. J. K. Henry
Keyword(s):  
Developing Countries ◽  
Menstrual Cycle ◽  
Food Intake ◽  
Energy Expenditure ◽  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Individual Variation ◽  
Low Energy ◽  
Metabolic Adaptation ◽  
Free Living

SummaryThe measurement of food intake has long been used to describe ‘adaptation’ to low energy intakes in certain tropical peoples. However, the methods available to quantify food intake are unlikely to reflect accurately real energy intakes in free living peoples. Alternatively, estimating energy expenditure shows some promise—particularly the measurement of basal metabolic rate (BMR). The BMR may be measured effectively in males, but females show wide intra-individual variation in BMR during their menstrual cycle, which makes BMR measurements more difficult to interpret in the context of adaptation. The use of double-labelled water may be the only method suitable to quantify and define ‘adaptation’ to low intakes in women.

scholarly journals Resting metabolic rate and the menstrual cycle

2015 ◽  
Vol 74 (OCE1) ◽  
Author(s):  
M. Campolier ◽  
S. Thondre ◽  
H. Lightowler
Keyword(s):  
Menstrual Cycle ◽  
Metabolic Rate ◽  
Resting Metabolic Rate

scholarly journals Resting metabolic rate and thermic effects of a sucrose-sweetened soft drink during the menstrual cycle in young Chinese women

1999 ◽  
Vol 77 (7) ◽  
pp. 544-550 ◽  
Author(s):  
Edmund TS Li ◽  
Louisa BY Tsang ◽  
Susan SH Lui
Keyword(s):  
Menstrual Cycle ◽  
Energy Expenditure ◽  
Metabolic Rate ◽  
Chinese Women ◽  
Soft Drink ◽  
Resting Metabolic Rate ◽  
Follicular Phase ◽  
Effect Of Food ◽  
Two Phases ◽  
Thermic Effect

The resting metabolic rate (RMR) and thermic effects (TEF) of a sucrose-sweetened soft drink in a group (n = 19) of ovulating young Chinese women were determined by indirect calorimetry in the midfollicular and midluteal phases of the menstrual cycle. Urinary luteinizing hormone surge was used to confirm ovulation. The RMR was measured twice in each phase and found to be similar (F(1,18) = 0.863) across the follicular (5018 kJ/24 h) and the luteal (5098 kJ/24 h) phases. Within each phase and on separate days, subjects were given water (280 mL) or sucrose-sweetened soft drink (539 kJ). Soft drink, but not water, consumption increased energy expenditure over a period of 45 min. Compared with the follicular phase, a small but significant increase in TEF (kJ/45 min) was observed in the luteal phase (t = 2.434, p < 0.05). Energy expenditure after drinking the soft drink, however, was similar in the two phases. RMR was positively correlated with TEF (r = 0.613, p < 0.01) and net TEF (r = 0.648, p < 0.005) in the luteal but not the follicular phase. In ovulating women, the thermic effect of sucrose is influenced by the phase of the menstrual cycle.Key words: menstrual cycle, resting metabolic rate, thermic effect of food, sucrose, Chinese women.

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