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Does Cumulating Endurance Training at the Weekends Impair Training Effectiveness?

Meyer T Does cumulating endurance training at the weekends impair training effectiveness? Eur J Cardiovasc Prev Rehabil. 2006 Aug;13(4):578-84.

BACKGROUND: Due to occupational restrictions many people’s recreational endurance activities are confined to the weekends. We intended to clarify if cumulating the training load in such a way diminishes endurance gains. DESIGN: We conducted a longitudinal study comparing training-induced changes within three independent samples. METHODS: Thirty-eight healthy untrained participants (45+/-8 years, 80+/-18 kg; 172+/-9 cm) were stratified for endurance capacity and sex and randomly assigned to three groups: ‘weekend warrior’ (n=13, two sessions per week on consecutive days, 75 min each, intensity 90% of the anaerobic threshold; baseline lactate+1.5 mmol/l), regular training (n=12, five sessions per week, 30 min each, same intensity as weekend warrior), and control (n=13, no training). Training was conducted over 12 weeks and monitored by means of heart rate. Identical graded treadmill protocols before and after the training program served for exercise prescription and assessment of endurance effects.… Keep Reading

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Differences in Glycemic Index of Cereal is Due to Glucose Removal

Schenk S et. al. Different glycemic indexes of breakfast cereals are not due to glucose entry into blood but to glucose removal by tissue.  Am J Clin Nutr. (2003) 78(4):742-8.

BACKGROUND: The glycemic index (GI) of a food is thought to directly reflect the rate of digestion and entry of glucose into the systemic circulation. The blood glucose concentration, however, represents a balance of both the entry and the removal of glucose into and from the blood, respectively. Such direct quantification of the postprandial glucose curve with respect to interpreting the GI is lacking in the literature. OBJECTIVE: We compared the plasma glucose kinetics of low- and high-GI breakfast cereals. DESIGN: On 2 occasions, plasma insulin concentrations and plasma glucose kinetics (by constant-rate infusion of [6,6-(2)H(2)]glucose) were measured in 6 healthy males for 180 min after they fasted overnight and then consumed an amount of corn flakes (CF) or bran cereal (BC) containing 50 g available carbohydrate.… Keep Reading