Consistent with the International Society of Clinical Densitometry guidelines, a cross calibration study was performed to remove systematic bias between the systems as previously published [18]. Dietary energy intake Dietary energy intake was assessed from 3-day diet logs (2 weekdays and 1 weekend-day) completed during week 3 of baseline and each month during the intervention as previously
published [18]. Participants met with a registered dietitian regularly who trained them how to record dietary intake accurately and reviewed the completed energy intake logs. Participants received written guidelines regarding proper measurement selleck compound and reporting of food portions and preparation. Resting energy expenditure REE was determined by indirect calorimetry
during week 3 of baseline Alvocidib solubility dmso and months 2, 3, 6, 9, and 13 (post-study) (Sensormedics Vmax metabolic cart, Yorba Linda, CA). Methods explaining the measurement of REE have been published in detail elsewhere [18]. Predicted REE (pREE) was also calculated using the Harris Benedict equation [19]. We compared the lab-assessed REE to the predicted REE (REE/pREE) to estimate how much the Idasanutlin in vivo measured REE deviated from the predicted REE. A reduced ratio of measured REE to Harris-Benedict predicted REE of 0.60-0.80 has been reported during periods of low body weight and prior to refeeding in anorexic women [20–22]. We have previously published data using a ratio of REE/pREE <0.90 as the operational definition
of an energy deficiency [1, 4, 16, 23]. As such, in this study, a ratio <0.90 was used to discriminate between being energy deficient and energy replete. Purposeful exercise energy expenditure Purposeful EEE was estimated at baseline and monthly during the intervention using a Polar heart rate monitor. Participants completed exercise logs where all purposeful exercise sessions greater than 10 minutes in duration were recorded for a 7-day period. Energy expended during these purposeful exercise sessions MYO10 was measured using the OwnCal feature of the Polar S610 or RS400 heart rate monitors (Polar Electro Oy, Kempele, Finland) [24]. The OwnCal feature has been validated for the use in calculating EEE from heart rate. The Polar S601 and RS400 hear rate monitors include rest in their estimation of energy expenditure. To estimate only EEE, we subtracted the most recently measured REE (kcal/min) from the Polar heart rate monitors’ estimation of energy expenditure. For purposeful exercise sessions in which participants did not wear the Polar S610 or RS400 heart rate monitors, the Ainsworth et al. [25, 26] compendiums of physical activities were used to determine the appropriate metabolic equivalent (MET) level for the exercise performed [27]. To calculate the energy expended during the exercise session, the MET level was multiplied by the duration (min) of the exercise session and the measured REE (kcal/min). The MET value includes a resting component.