Energy Bar Research Articles

This study examined the influence of a supplement matrix on the excretion pattern of nandrolone metabolites in response to ingestion of a trace amount of 19-norandrostenedione. Ten male and nine female volunteers (mean ± SD: age = 26 ± 3 yr, height = 1.71 ± 0.09 m, body mass = 70.9 ± 13.2 kg) were recruited. On two occasions, subjects entered the laboratory in the morning after an overnight fast. After an initial urine collection, subjects ingested either 500 mL of plain water or a commercially available energy bar; 10 µg of 19-norandrostenedione was added to each. The volume of each urine sample passed during the next 24 h was measured, and an aliquot was retained for analysis. All samples were analyzed for the metabolites 19-norandrosterone (19-NA) and 19-noretiocholanolone (19-NE) by gas chromatography-mass spectrometry. The total volume of urine passed was higher in the water trial (2.10 ± 0.52 L) than in the bar trial (1.85 ± 0.55 L; P = 0.040). Baseline urinary 19-NA concentrations were all below the limit of quantification for the assay. Peak urinary 19-NA was lower (P = 0.002) in the water trial (4.80 ± 2.84 ng·mL(-1)) than in the bar trial (8.46 ± 4.44 ng·mL(-1)). The time elapsed between ingestion of the supplement and the peak urinary 19-NA concentration was longer (P = 0.023) on the bar trial (4.6 ± 2.4 h) than on the water trial (2.8 ± 1.9 h). There was no difference in the total recovery of 19-NA + 19-NE between the liquid and solid supplements (water 30 ± 10%; bar 28 ± 12%; P < 0.140). Peak 19-NA concentrations were higher, and occurred later, when the 19-norandrostenedione was added to a solid supplement. This may be due to a slower rate of absorption and/or a reduced diuresis, resulting in a longer period for the metabolites to accumulate in the urine.

Background: Acute exercise is associated with increased insulin sensitivity characterized by increased insulin-induced glucose transport for periods of up to 48h after the bout of exercise. This suggests that the glycemic response to a meal may be altered by prior exercise.Objective: We tested the hypothesis that the glycemic and insulinemic responses to a test food consumed following exercise would be lower than when consumed without prior exercise.Design: Four lean males (age: 27 ± 4 y) and 4 females (age: 23 ± 3 y) completed 3 experimental conditions in random order: ExCHO—Subjects exercised on a cycle ergometer at 70% VO2peak with a net energy cost of 400 kcal, which was followed by consumption of a high carbohydrate (CHO) energy bar; NoExCHO—Same as ExCHO except subjects sat quietly rather than exercised; and NoExGlc—Same as NoExCHO except subjects consumed a 50 g glucose (glc) drink as the reference CHO for GI and insulinemic index (II) determination. For each condition, following exercise or rest, baseline venous blood samples were obtained. Postprandial blood samples were obtained at 15 min intervals for 2 h.Results: Neither the 2-h glucose area under the curve (AUC) or the GI were different between ExCHO and NoExCHO. The insulin AUC for ExCHO was 28% lower than the insulin AUC for NoExCHO (p = 0.03). The calculated II for the ExCHO condition was 30% lower than that of NoExCHO (p = 0.05).Conclusions: An acute bout of prior exercise had no effect on the GI of an energy bar compared to that of the same food determined under the standard no-exercise conditions. However, prior exercise resulted in a lower 2-h insulin response to the CHO-rich energy bar.

Energy Bar Research Articles

Related Topics

Articles published on Energy Bar

Challenges when developing omega-3 enriched foods

Influence of Delivery Mode on the Urinary Excretion of Nandrolone Metabolites

Rule Changes Mean 1992 Marketing Opportunities for LDCs

The mother of all NOPRs

Order 636 battle far from over

Questionnaire Offers Preview of Incentive-Ratemaking Issues

Is the Mother of AII NOPRs Frowning at LDCs?

Order 636-a leaves LDCs without measurable benefits

Getting serious about comparable pipeline service

State regulation of LDCs under scrutiny at doe

Facies de patch reefs en la Formación Picún Leufú (límite Jurásico/Cretácico) en la región de Zapala, Cuenca Neuquina

Summer electric generation capacity: Don't stop thinking about tomorrow

Entergy-Koch convergence implicates order 497 standards of conduct

First several years of millennium affected by current questions

FERC's certificate policy statement: LDCs want more market reforms

Energy marketing, internet style

Dietary tyrosine benefits cognitive and psychomotor performance during body cooling

In Translation: A Sampler

Effect of Acute Prior Exercise on Glycemic and Insulinemic Indices

Saddle index properties, singular topology, and its relation to thermodynamic singularities for aϕ4mean-field model

Lead the way for us

Editage

Paperpal

R Discovery

Mind the Graph

Energy Bar Research Articles

Related Topics

Articles published on Energy Bar

Challenges when developing omega-3 enriched foods

Influence of Delivery Mode on the Urinary Excretion of Nandrolone Metabolites

Rule Changes Mean 1992 Marketing Opportunities for LDCs

The mother of all NOPRs

Order 636 battle far from over

Questionnaire Offers Preview of Incentive-Ratemaking Issues

Is the Mother of AII NOPRs Frowning at LDCs?

Order 636-a leaves LDCs without measurable benefits

Getting serious about comparable pipeline service

State regulation of LDCs under scrutiny at doe

Facies de patch reefs en la Formación Picún Leufú (límite Jurásico/Cretácico) en la región de Zapala, Cuenca Neuquina

Summer electric generation capacity: Don't stop thinking about tomorrow

Entergy-Koch convergence implicates order 497 standards of conduct

First several years of millennium affected by current questions

FERC's certificate policy statement: LDCs want more market reforms

Energy marketing, internet style

Dietary tyrosine benefits cognitive and psychomotor performance during body cooling

In Translation: A Sampler

Effect of Acute Prior Exercise on Glycemic and Insulinemic Indices

Saddle index properties, singular topology, and its relation to thermodynamic singularities for aϕ4mean-field model