Level of dietary protein impacts whole body protein turnover in trained males at rest

Gaine, P. Courtney; Pikosky, Matthew A.; Martin, William; Bolster, Douglas R.; Maresh, Carl M.; Rodriguez, Nancy R.

doi:10.1016/j.metabol.2005.10.012

Cited by 46 publications

(36 citation statements)

References 30 publications

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“…0.44 g protein kg ¡1 day ¡1 ) per g of dietary protein kg ¡1 day ¡1 . Such an eYciency (0.44) is lower than 0.59 reported in 12.7-year-old children (Gattas et al 1992) but similar to 0.47 reported in adults (DRI 2005) and to the value (0.40) calculated in endurance trained young men (Gaine et al 2006). With the increase in energy balance there was an increase of 0.88 mg N per 1 kJ kg EBW ¡1 day ¡1 (corresponding to 0.092 kJ if we assume that it is body proteins).…”

Section: Discussionsupporting

confidence: 61%

Protein requirements in male adolescent soccer players

et al. 2007

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Few investigations have studied protein metabolism in children and adolescent athletes which makes difficult the assessment of daily recommended dietary protein allowances in this population. The problematic in paediatric competitors is the determination of additional protein needs resulting from intensive physical training. The aim of this investigation was to determine protein requirement in 14-year-old male adolescent soccer players. Healthy male adolescent soccer players (N = 11, 13.8 +/- 0.1 year) participated in a short term repeated nitrogen balance study. Diets were designed to provide proteins at three levels: 1.4, 1.2 and 1.0 g protein per kg body weight (BW). Nutrient and energy intakes were assessed from 4 day food records corresponding to 4 day training periods during 3 weeks. Urine was collected during four consecutive days and analysed for nitrogen. The nitrogen balances were calculated from mean daily protein intake, mean urinary nitrogen excretion and estimated faecal and integumental nitrogen losses. Nitrogen balance increased with both protein intake and energy balance. At energy equilibrium, the daily protein intake needed to balance nitrogen losses was 1.04 g kg(-1) day(-1). This corresponds to an estimated average requirement (EAR) for protein of 1.20 g kg(-1) day(-1) and a recommended daily allowance (RDA) of 1.40 g kg(-1) day(-1) assuming a daily nitrogen deposition of 11 mg kg(-1). The results of the present study suggest that the protein requirements of 14-year-old male athletes are above the RDA for non-active male adolescents.

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Section: Discussionsupporting

confidence: 61%

Protein requirements in male adolescent soccer players

et al. 2007

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“…Substrate oxidation can be affected by diet, body composition, and physical activity [33][34][35][36][37][38][39]. The noted changes in substrate oxidation reflect changes in diet composition from that noted at baseline to that used for the weight loss intervention (51% CHO, 17% PTN, and 32% FAT vs 42% CHO, 28% PTN, and 32% FAT; for baseline and weight loss intervention, respectively).…”

Section: Discussionmentioning

confidence: 99%

“…This difference likely contributed to a decrease in fat oxidation. With regard to the changes noted in protein oxidation, Gaine et al [35] found that increasing protein intake from 0.8 to 1.8 and 3.6 g/kg per day resulted in a parallel increase in protein oxidation. Increased protein oxidation in the current study is consistent with findings reported in the study of Gaine et al such that a significant increase in protein intake from 1.1 to 1.4 g/kg per day corresponded with an increase in protein oxidation.…”

Section: Discussionmentioning

confidence: 99%

“…The noted changes in substrate oxidation suggest the use of protein as an alternative fuel when a reduced-energy diet providing a greater percentage of energy from protein (vs carbohydrate) is habitually consumed. Finally, a higher rate of protein turnover consequent to increased protein intake [35] or increased physical activity [43] may have contributed to the maintenance of REE. The maintenance of REE provides additional evidence in support of higher protein intakes for the nutritional management of overweight and obesity in this population.…”

Section: Discussionmentioning

confidence: 99%

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Maintenance of resting energy expenditure after weight loss in premenopausal women: potential benefits of a high-protein, reduced-calorie diet

et al. 2008

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“…24 h −1 during a training season [105]. Additional investigations on whole body protein turnover [106] and skeletal muscle fractional synthetic rates in trained endurance humans [107] suggest that a protein intake of 1.2 g protein −1 . 24 h −1 (or 10-12% of total energy) should achieve a positive nitrogen balance.…”

Section: How Much Proteins?mentioning

confidence: 99%

Protein metabolism and physical training: any need for amino acid supplementation?

Poortmans

Carpentier

2016

Nutrire

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Muscle mass is the major deposit of protein molecules with dynamic turnover between net protein synthesis and degradation. In human subjects, invasive and non-invasive techniques have been applied to determine their skeletal muscle catabolism of amino acids at rest, during and after different forms of physical exercise and training. The aim of this review is to analyse the turnover flux and the relative oxidation rate of different types of muscle proteins after one bout of exercise as well as after resistance and endurance condition of training. Protein feeding in athletes appears to be a crucial nutrition necessity to promote the maintenance of muscle mass and its adaptation to the need imposed by the imposed technical requirements. In resting human individuals, the recommended protein daily allowance is about 0.8 g (dry weight) kg −1 body weight per 24 h knowing that humans are unable to accumulate protein stores in muscle tissues. Nevertheless, practical feeding recommendations related to regular exercise practice are proposed to athletes by different bodies in order to foster their skills and performance. This review will examine the results obtained under endurance and resistance type of exercise while consuming single or repeated doses of various ingestions of protein products (full meat, essential amino acids, specific amino acids and derivatives, vegetarian food). From the scientific literature, it appears that healthy athletes (and heavy workers) should have a common diet of 1.25 g kg −1 24 h to compensate the exercise training muscle protein degradation and their resynthesis within the following hours. A nitrogen-balance assay would be recommended to avoid any excessive intake of protein. Eventually, a daily equilibrated food intake would be of primer importance versus inadequate absorption of some specific by-products.

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Level of dietary protein impacts whole body protein turnover in trained males at rest

Cited by 46 publications

References 30 publications

Protein requirements in male adolescent soccer players

Protein requirements in male adolescent soccer players

Maintenance of resting energy expenditure after weight loss in premenopausal women: potential benefits of a high-protein, reduced-calorie diet

Protein metabolism and physical training: any need for amino acid supplementation?

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