Diet, Healthy Clinical Trial
— PROPEROfficial title:
Reduced Dietary Protein, Performance and Health
The present study is a parallel group design with randomised allocation to either a 1) reduced protein diet (RP) or a 2) normal protein diet (NP). The two groups will be pair-matched based on habitual dietary protein intake, endurance training, endurance performance, and sex. The aim of the study is to investigate the effects of reducing dietary protein (~1g protein/kg body mass) compared to an eucaloric normal protein diet (~2g protein/kg body mass) for 6 weeks in well-trained endurance athletes on endurance performance, body composition, skeletal muscle protein synthesis, and health-related outcomes. The hypothesis is that endurance performance will maintain or even be improved in well-trained endurance athletes after a 6-week dietary intervention of an eucaloric, protein reduced diet compared to a normal protein rich diet.
Status | Recruiting |
Enrollment | 20 |
Est. completion date | December 31, 2025 |
Est. primary completion date | December 31, 2024 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | Male |
Age group | 20 Years to 50 Years |
Eligibility | Inclusion Criteria: - Endurance athlete - Exercising at least 10hrs per week - Habitual dietary protein intake ~2g/kg body mass - BMI<25 Exclusion Criteria: - Food allergies that exclude the controlled diet - Inconsistent endurance training load |
Country | Name | City | State |
---|---|---|---|
Denmark | University of Copenhagen | Copenhagen |
Lead Sponsor | Collaborator |
---|---|
University of Copenhagen | Maastricht University Medical Center |
Denmark,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Endurance performance on a bike | Endurance performance defined as maximal aerobic power (Wmax) during incremental test to exhaustion on a bike measured as 1-minute mean power output (W) | From Pre (week0) to post (week6) | |
Primary | Microbiome | Diversity of bacterial strains in gut microbiome measured in feces samples | Run-in (week-3 to week0) vs dietary intervention (week0 to week6) | |
Secondary | Resting metabolic rate | Measured in an over-night fasted state via indirect calorimetry expressed in MJ/day | Pre (week0) to mid (week3) | |
Secondary | Resting metabolic rate | Measured in an over-night fasted state via indirect calorimetry expressed in MJ/day | Pre (week0) to Post (week6) | |
Secondary | Lean body mass | Measured by dual-energy x-ray (DXA)-scanningg expressed in kg | Run-in (week-3) to Pre (week0) | |
Secondary | Lean body mass | Measured by dual-energy x-ray (DXA)-scanning expressed in kg | Pre (week0) to Post (week6) | |
Secondary | Total fat mass | Measured by dual-energy x-ray (DXA)-scanning expressed in kg | Pre (week0) to Post (week6) | |
Secondary | Total fat mass | Measured by dual-energy x-ray (DXA)-scanning expressed in kg | Pre (week0) to mid (week3) | |
Secondary | Total fat mass | Measured by dual-energy x-ray (DXA)-scanning expressed in kg | Run-in (week-3) to Pre (week0) | |
Secondary | Power output at 4mmol/L blood lactate | Alterations in Power output at 4mmol/L blood lactate in response to diet | Pre (week0) to mid (week3) | |
Secondary | Power output at 4mmol/L blood lactate | Alterations in Power output at 4mmol/L blood lactate in response to diet | Pre (week0) to Post (week6) | |
Secondary | Fractional utilisation of maximal oxygen uptake at 4mmol/L blood lactate | Alterations in Fractional utilisation of maximal oxygen uptake at 4mmol/L blood lactate in response to diet | Pre (week0) to mid (week3) | |
Secondary | Fractional utilisation of maximal oxygen uptake at 4mmol/L blood lactate | Alterations in Fractional utilisation of maximal oxygen uptake at 4mmol/L blood lactate in response to diet | Pre (week0) to Post (week6) | |
Secondary | Maximal oxygen uptake VO2peak | Alterations in Maximal oxygen uptake VO2peak measured by an online VO2 apparatus | Pre (week0) to mid (week3) | |
Secondary | Maximal oxygen uptake VO2peak | Alterations in Maximal oxygen uptake VO2peak measured by an online VO2 apparatus | Pre (week0) to Post (week6) | |
Secondary | Peak power output on a 10-seconds sprint | Alterations in peak power output on a 10-seconds sprint in response to diet | Pre (week0) to mid (week3) | |
Secondary | Peak power output on a 10-seconds sprint | Alterations in peak power output on a 10-seconds sprint in response to diet | Pre (week0) to Post (week6) | |
Secondary | Mean power output on a 10-seconds sprint | Alterations in mean power output on a 10-seconds sprint in response to diet | Pre (week0) to mid (week3) | |
Secondary | Mean power output on a 10-seconds sprint | Alterations in mean power output on a 10-seconds sprint in response to diet | Pre (week0) to Post (week6) | |
Secondary | Gross efficiency on a bike | Gross efficiency expressed as % of external power compared to internal (metabolic) power | Pre (week0) to mid (week3) | |
Secondary | Gross work efficiency on a bike | Gross efficiency expressed as % of external power compared to internal (metabolic) power | Pre (week0) to Post (week6) | |
Secondary | 15-minute time-trial power output on a bike | Alterations in 15-minute time-trial mean power output | Pre (week0) to mid (week3) | |
Secondary | 15-minute time-trial power output on a bike | Alterations in 15-minute time-trial mean power output | Pre (week0) to Post (week6) | |
Secondary | Fractional utilisation of maximal oxygen uptake during 15-minute time-trial | Alterations in Fractional utilisation of maximal oxygen uptake during 15-minute time-trial | Pre (week0) to mid (week3) | |
Secondary | Fractional utilisation of maximal oxygen uptake during 15-minute time-trial | Alterations in Fractional utilisation of maximal oxygen uptake during 15-minute time-trial | Pre (week0) to Post (week6) | |
Secondary | Respiratory exchange ratio | respiratory exchange ratio (RER) during rest and exercise using indirect calorimetry | Pre (week0) to Post (week6) | |
Secondary | Respiratory exchange ratio | respiratory exchange ratio (RER) during rest and exercise using indirect calorimetry | Pre (week0) to Mid (week3) | |
Secondary | Training load | Training load as quantified by Edward's Training Impulse based on heart rate zones | Run-in (week-3) vs dietary intervention (week0 to week6) | |
Secondary | Energy intake | Habitual energy intake registered by food diaries expressed in Mega Joules | Run-in (week-3) vs dietary intervention (week0 to week6) | |
Secondary | Energy expenditure | Energy expenditure is measured by combining resting metabolic rate and daily activity recording from accelerometer data and heart rate monitor | Run-in (week-3) vs dietary intervention (week0 to week6) | |
Secondary | Blood lactate concentration | Glucose lactate measured in fasted state on an ABL800 | Run-in (week-3 to week0) vs dietary intervention (week0 to week6) | |
Secondary | Blood glucose concentration | Glucose concentration measured in fasted state on an ABL800 | Run-in (week-3 to week0) vs dietary intervention (week0 to week6) | |
Secondary | Blood amino acid concentration | Amino acid concentration measured by ELISA | Run-in (week-3 to week0) vs dietary intervention (week0 to week6) | |
Secondary | Plasma metabolomics | Plasma metabolomics by chromatography-mass spectrometry | Run-in (week-3 to week0) vs dietary intervention (week0 to week6) | |
Secondary | Skeletal muscle protein expression | Alterations in Skeletal muscle protein expression | Pre (week0) to mid (week3) | |
Secondary | Skeletal muscle protein expression | Alterations in Skeletal muscle protein expression | Pre (week0) to Post (week6) | |
Secondary | Haemoglobin mass expressed in grams | Haemoglobin mass measured via inhalation of carbon monoxide (CO) using the modified CO-rebreathing method | Pre (week0) to mid (week3) | |
Secondary | Haemoglobin mass expressed in grams | Haemoglobin mass measured via inhalation of carbon monoxide (CO) using the modified CO-rebreathing method | Pre (week0) to Post (week6) | |
Secondary | Blood volume in ml | Blood volume measured via inhalation of carbon monoxide (CO) using the modified CO-rebreathing method | Pre (week0) to Post (week6) | |
Secondary | Blood volume in ml | Blood volume measured via inhalation of carbon monoxide (CO) using the modified CO-rebreathing method | Pre (week0) to Mid (week3) | |
Secondary | Energy expenditure measured as energy intake to maintain body weight | Daily energy intake during intervention measured in Mega Joules | Run-in (week-3 to week0) vs dietary intervention (week0 to week6) |
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