Comparison of basal metabolic rate by indirect calorimetry and predictive model

The objective of this study was to compare the values of basal metabolic rate (BMR) obtained by indirect calorimetry (IC) and by predictive model (PM). Methodology: 6 women, age (23.8 ± 3.1 years), height (165 ± 5.8 cm), body mass (55.9 ± 4.9 kg), fat free mass (43 ± 2.1 kg), fat body mass (12.9 ± 3.3 kg), percentage of body fat (22.8 ± 4.2%) were subjected to the test of IC. The IC test was done early in the morning, after 12 hours of fasting, without attainment of physical activity within the last 24 hours and abstinence of alcohol in the last 48 hours. Initially, the volunteers remained at rest for 20 minutes, followed by 20 minutes of measurement by gas analyzer VO2000. To obtain the BMR by the EP the Harris Benedict formula was used , applied for women between 15-74 years: 655.0955 + 9.5634 (weight kg) + 1.8496 (height cm) - 4.6756 (age). For the processing of data the statistical program Instat was used through the paired t test (p \u3c0.05), and the results were expressed as mean and standard deviation of the mean. Results: The value of BMR through the IC was 1423.0±6 calories and through PM 1383.5±6 calories, with no statistically significant differences between the two methods. There was no significant difference between the methods, and thus, the PM can be considered a useful tool to estimate the BMR, as a more accessible and less costly method to this population

Blood lactate kinetics during four sets of bench press with 75% of 1RM

The purpose of the study was to analyze blood lactate kinetics during bench press exercise. 7 resistance-trained men (aged 21.66 ± 0.57 years, body mass 84.33 ± 9.50Kg, height 178.33 ± 0.05 cm, BMI 26.46 ± 2.11 kg/m2) volunteered for the study. The first session consisted of a 1-RM bench press test. After 48 hours, subjects returned and performed a warm up (20 repetitions with 40% 1-RM) and 4 sets of 8 repetitions with an intensity corresponding to 75% of 1-RM, separated by a 2-minute rest interval. Blood samples were collected at rest (R), after the warm up (W), at the end of each rest interval (INT) and immediately after each set (SET) for further lactate concentration analysis using a lactate analyzer (YSI, SPORT 1500®). Results indicate a trend to glucose metabolism, as shown by blood lactate concentration. The higher values at the end of each rest interval indicate that lactate was removed to blood. Blood lactate concentrations were smaller after each set, when compared to the previous interval. These results could be caused by a reduction in glucose metabolism during the sets or even by lactate removal by other tissues, as this is possibly the blood lactate kinetics during such a protocol