http://fitmarker.com/ Stories posted in Food/Nutrition en-us Mon, 21 May 2012 15:08:16 -0500 http://fitmarker.com/foodnutrition/glycemia-and-insulinemia-in-healthy-subjects-after-lactose-equivalent-meals-of-milk-and-other-food-proteins-the-role-of-plasma-amino-acids-and-incretins/ Sat, 05 May 2012 16:40:30 -0500 http://fitmarker.com/foodnutrition/glycemia-and-insulinemia-in-healthy-subjects-after-lactose-equivalent-meals-of-milk-and-other-food-proteins-the-role-of-plasma-amino-acids-and-incretins/ http://fitmarker.com/foodnutrition/enhanced-amino-acid-sensitivity-of-myofibrillar-protein-synthesis-persists-for-up-to-24-h-after-resistance-exercise-in-young-men/ Abstract: We aimed to determine whether an exercise-mediated enhancement of muscle protein synthesis to feeding persisted 24 h after resistance exercise. We also determined the impact of different exercise intensities (90% or 30% maximal strength) or contraction volume (work-matched or to failure) on the response at 24 h of recovery. Fifteen men (21 ± 1 y, BMI = 24.1 ± 0.8 kg · m(-2)) received a primed, constant infusion of l-[ring-(13)C(6)]phenylalanine to measure muscle protein synthesis after protein feeding at rest (FED; 15 g whey protein) and 24 h after resistance exercise (EX-FED). Participants performed unilateral leg exercises: 1) 4 sets at 90% of maximal strength to failure (90FAIL); 2) 30% work-matched to 90FAIL (30WM); or 3) 30% to failure (30FAIL). Regardless of condition, rates of mixed muscle protein and sarcoplasmic protein synthesis were similarly stimulated at FED and EX-FED. In contrast, protein ingestion stimulated rates of myofibrillar protein synthesis above fasting rates by 0.016 ± 0.002%/h and the response was enhanced 24 h after resistance exercise, but only in the 90FAIL and 30FAIL conditions, by 0.038 ± 0.012 and 0.041 ± 0.010, respectively. Phosphorylation of protein kinase B on Ser473 was greater than FED at EX-FED only in 90FAIL, whereas phosphorylation of mammalian target of rapamycin on Ser2448 was significantly increased at EX-FED above FED only in the 30FAIL condition. Our results suggest that resistance exercise performed until failure confers a sensitizing effect on human skeletal muscle for at least 24 h that is specific to the myofibrillar protein fraction. ]]> Wed, 25 Apr 2012 02:06:26 -0500 http://fitmarker.com/foodnutrition/enhanced-amino-acid-sensitivity-of-myofibrillar-protein-synthesis-persists-for-up-to-24-h-after-resistance-exercise-in-young-men/ http://fitmarker.com/foodnutrition/a-calorie-is-a-calorie-violates-the-second-law-of-thermodynamics/ Abstract: The principle of "a calorie is a calorie," that weight change in hypocaloric diets is independent of macronutrient composition, is widely held in the popular and technical literature, and is frequently justified by appeal to the laws of thermodynamics. We review here some aspects of thermodynamics that bear on weight loss and the effect of macronutrient composition. The focus is the so-called metabolic advantage in low-carbohydrate diets--greater weight loss compared to isocaloric diets of different composition. Two laws of thermodynamics are relevant to the systems considered in nutrition and, whereas the first law is a conservation (of energy) law, the second is a dissipation law: something (negative entropy) is lost and therefore balance is not to be expected in diet interventions. Here, we propose that a misunderstanding of the second law accounts for the controversy about the role of macronutrient effect on weight loss and we review some aspects of elementary thermodynamics. We use data in the literature to show that thermogenesis is sufficient to predict metabolic advantage. Whereas homeostasis ensures balance under many conditions, as a general principle, "a calorie is a calorie" violates the second law of thermodynamics. ]]> Fri, 20 Apr 2012 04:53:03 -0500 http://fitmarker.com/foodnutrition/a-calorie-is-a-calorie-violates-the-second-law-of-thermodynamics/ http://fitmarker.com/foodnutrition/beachbody-ultimate-reset-comprehensive-review-of-the-21-day-cleansedetox-program/ Tue, 17 Apr 2012 00:12:22 -0500 http://fitmarker.com/foodnutrition/beachbody-ultimate-reset-comprehensive-review-of-the-21-day-cleansedetox-program/ http://fitmarker.com/foodnutrition/how-much-protein-the-body-can-use-in-a-single-meal/ Tue, 10 Apr 2012 11:16:39 -0500 http://fitmarker.com/foodnutrition/how-much-protein-the-body-can-use-in-a-single-meal/ http://fitmarker.com/foodnutrition/afternoon-sleepiness-protein-not-sugar-keeps-us-awake/ Sun, 20 Nov 2011 23:45:49 -0600 http://fitmarker.com/foodnutrition/afternoon-sleepiness-protein-not-sugar-keeps-us-awake/ http://fitmarker.com/foodnutrition/is-dairy-healthy-the-whole-story-part-2-eric-cressey-high-performance-training-personal-training/ Tue, 04 Oct 2011 04:53:13 -0500 http://fitmarker.com/foodnutrition/is-dairy-healthy-the-whole-story-part-2-eric-cressey-high-performance-training-personal-training/ http://fitmarker.com/foodnutrition/denmark-introduces-fat-tax-health-cbc-news/ Sun, 02 Oct 2011 23:58:09 -0500 http://fitmarker.com/foodnutrition/denmark-introduces-fat-tax-health-cbc-news/ http://fitmarker.com/foodnutrition/is-dairy-healthy-the-whole-story-part-1-eric-cressey-high-performance-training-personal-training/ Fri, 30 Sep 2011 15:36:42 -0500 http://fitmarker.com/foodnutrition/is-dairy-healthy-the-whole-story-part-1-eric-cressey-high-performance-training-personal-training/ http://fitmarker.com/foodnutrition/the-in-vitro-anti-fertility-effects-of-acacia-nilotica-on-human-spermatozoa-function/ Fri, 30 Sep 2011 02:23:48 -0500 http://fitmarker.com/foodnutrition/the-in-vitro-anti-fertility-effects-of-acacia-nilotica-on-human-spermatozoa-function/