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Trial registered on ANZCTR
Registration number
ACTRN12622000924752
Ethics application status
Approved
Date submitted
22/03/2022
Date registered
28/06/2022
Date last updated
9/05/2024
Date data sharing statement initially provided
28/06/2022
Type of registration
Prospectively registered
Titles & IDs
Public title
Effects of rapid weight loss on strength capabilities of powerlifters
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Scientific title
Assessment of the effect of a rapid weight loss by approximately of 5% body mass on maximal strength capacity levels in powerlifters
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Secondary ID [1]
306735
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None
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Universal Trial Number (UTN)
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Trial acronym
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Linked study record
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Health condition
Health condition(s) or problem(s) studied:
body mass reduction
325725
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strength training
325726
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low muscle mass
325727
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nutritional status
325728
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low mood
325729
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Condition category
Condition code
Diet and Nutrition
323069
323069
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0
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Other diet and nutrition disorders
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Metabolic and Endocrine
323070
323070
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0
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Normal metabolism and endocrine development and function
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Mental Health
323071
323071
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0
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Other mental health disorders
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Musculoskeletal
323299
323299
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0
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Other muscular and skeletal disorders
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Intervention/exposure
Study type
Interventional
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Description of intervention(s) / exposure
Implementation of a ketogenic diet, low-fiber diet, and dehydration to induce a rapid loss of 5% of body mass as well as application of a recuperation process between weigh-ins and simulated competitions consisting of proper hydration and adequate carbohydrate supply.
The following procedures/activities will be performed:
- During the first week of the experiment, each athlete will reduce their usual training volume by 50% with training intensity maintained. Each athlete will perform 2 training units (participants will undergo a 1-hour exercise block consisting of their usual training regimen on days 1 and 3). On days 4-6, each athlete's eating habits will be assessed.
- On day 7 at 9:00 am, baseline anthropometric measurements will be taken in the gym where the participants regularly train. Following the anthropometric measurements, athletes will complete mental status and lifestyle questionnaires. Between the anthropometric measurements and the start of the simulated powerlifting competition, there will be a 2-hour break. At 11:00 am a simulated competition in powerlifting triathlon will begin, during which the maximum strength of athletes will be measured; participants will undergo a powerlifting component including the squat, bench press, and deadlift.
- On days 10-13, athletes in group one will follow a dietary strategy leading to a 5% rapid weight loss (nothing will occur if participants are not able to achieve the expected rapid 5% weight loss).
- On day 10, there will be an additional single training - the training will be the same as day 3 of the study.
- On day 14 at 9:00 am, control anthropometric measurements will be taken in the gym where the participants regularly train. Following the anthropometric measurements, athletes will complete UWIST Mood Adjective Check List in the Polish adaptation by Gorynska (2005). Between the anthropometric measurements and the start of the simulated powerlifting competition, there will be a 2-hour break. At 11:00 am a simulated competition in powerlifting competition will begin, during which the maximum strength of athletes will be measured.
All the procedures will be conducted by the main investigator Arkadiusz Matras (dietician) and will be supported by Michal Czapla (dietician and paramedic). The Simulated competitions will be conducted in accordance with the rules of the IPF federation. The composition of the ketogenic and low-fiber diet included a detailed list of meals prepared in the form of an Individualized Nutrition Program (INP), which included a dietary schedule of meals including their composition expressed in grams and items, the caloric content of meals, macronutrient profile (proteins, carbohydrates, fats, and fiber), and meal consumption times.
Participants will receive 2 days before the planned rapid weight loss procedure a written menu in the Kcalmar.pro program together with a shopping list and method of preparation and planned supplementation. The menu will be sent via e-mail. The expected rapid weight loss process will occur over 5 days (days 10-14). There was a 2-hour break between the anthropometric measurements and the start of the second simulated powerlifting competition, during which the competitors from the experimental group used a regeneration strategy consisting in consuming a bolus of 800 ml of Oral Rehydration Solution and then consuming 150% of the fluid weight they lost in the process of rapid weight reduction until the start of the simulated competition. All competitors consumed approximately 100 g of carbohydrates between body weight measurement and the start. During the simulated powerlifting competition, all participants had access to fluids and food ad libitum.
The following strategies will be used to monitor adherence:
- For adherence to eating habits: 3-day food diary: the diet will be checked for provided kilocalories, protein, carbohydrates, fats, minerals, vitamins, and dietary fiber according to the Institute of Food and Nutrition and USDA National Nutrient Database.
- For adherence to training restrictions: email information sent by the athlete.
- For adherence to a rapid 5% body weight loss strategy: body composition analysis performed using the InBody570 analyzer as well as constant e-mail and phone contact with athletes.
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Intervention code [1]
323183
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Lifestyle
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Intervention code [2]
323184
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Treatment: Other
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Comparator / control treatment
The control group maintains their standard eating habits for weight maintenance and thus does not result in a rapid weight loss of 5% body mass. The diet of participants in the control group will be unchanged and at the discretion of the participant.
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Control group
Active
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Outcomes
Primary outcome [1]
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The maximal strength capacity using TOTAL (squat + benchpress + deadlift) test in simulated powerlifting competitions.
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Assessment method [1]
330834
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Timepoint [1]
330834
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7 and 14 (primary endpoint) days post-intervention commencement
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Secondary outcome [1]
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Strength capacity in relation to body weight using IPF Good Lift in powerlifting competitions.
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Assessment method [1]
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Timepoint [1]
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7 and 14 days post-intervention commencement
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Secondary outcome [2]
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Strength capacity in relation to body weight using IPF Good Lift Bench Press in powerlifting competitions.
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Assessment method [2]
407785
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Timepoint [2]
407785
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7 and 14 days post-intervention commencement
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Secondary outcome [3]
407786
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The body composition using the bioelectrical impedance analysis (BIA) method
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Assessment method [3]
407786
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Timepoint [3]
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7 days post-intervention commencement
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Secondary outcome [4]
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Dietary habits using a 3-day food diary according to the USDA National Nutrient Database (this is a primary outcome)
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Assessment method [4]
410785
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Timepoint [4]
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3, 4 and 5 days post-intervention commencement
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Secondary outcome [5]
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Rating Perceived Exertion (10-points scale)
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Assessment method [5]
410786
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Timepoint [5]
410786
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7 and 14 days post-intervention commencement
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Eligibility
Key inclusion criteria
1. Male sex.
2. Practicing powerlifting for at least 2 years.
3. Participation in at least one powerlifting competition.
4. Informed consent to participate in the study.
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Minimum age
19
Years
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Maximum age
40
Years
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Sex
Males
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Can healthy volunteers participate?
Yes
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Key exclusion criteria
1. Use of doping substances and methods.
2. Medical contraindications indicated by a doctor.
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Study design
Purpose of the study
Treatment
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Allocation to intervention
Randomised controlled trial
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Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Central randomisation by computer
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Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Simple randomisation using a randomisation table created by computer software (i.e., computerised sequence generation)
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Masking / blinding
Open (masking not used)
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Who is / are masked / blinded?
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Intervention assignment
Parallel
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Other design features
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Phase
Not Applicable
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Type of endpoint/s
Efficacy
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Statistical methods / analysis
Statistical analysis
Statistical analysis of the results will be performed in Statistica 13 (TIBCO Software Inc.). Comparison of qualitative variables in groups will be made using the Chi-square test (with Yates correction for 2x2 tables) or Fisher's exact test where low expected numbers appear in tables. Comparison of values of quantitative variables in two groups will be done using Student's t-test for variables with normal distribution or Mann-Whitney test where the distribution of the variable is non-normal. Comparison of the values of quantitative variables in three and more groups will be made using analysis of variance (ANOVA) for variables with normal distribution or Kruskal-Wallis test in the absence of normality of the variable distribution. Once statistically significant differences are detected, the post-hoc analysis will be performed using Tukey's HSD test or Dunn's test (respectively, when the normal distribution is confirmed or not) to identify statistically significantly different groups. Correlations between quantitative variables were analyzed using Pearson's correlation coefficient (for variables with normal distribution) or Spearman's correlation coefficient (when the distribution of variables is non-normal). The level of statistical significance will be set at p<0.05.
Sample size
Sample size analysis was performed in Statistica 13 (TIBCO Software Inc.) based on available results from Durguerian et al. It was evaluated how the maximum strength capacity of the athletes expressed as Total (kg) differed between two groups (Group 1 vs. Group 2). The estimated sample size was calculated based on the t-test for means of two samples (t-test for independent samples). Parameters: the mean difference in Group 1 was 8 kg (SD=4.5 kg); the mean in Group 2 was 2.8 (SD = 4.2); The alpha level was set at 0.05 and the power of the test was set at 0.8. It was also assumed that there was no correlation of the variables evaluated and the two-sided null hypothesis was accepted. Based on the parameters, an estimated sample size of 13 patients in each group was obtained. Additionally, the risk of losing patients in the study was assumed to be 15%. The final sample size is 15 participants in each group
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Recruitment
Recruitment status
Completed
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Date of first participant enrolment
Anticipated
4/07/2022
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Actual
1/11/2022
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Date of last participant enrolment
Anticipated
25/08/2022
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Actual
27/03/2023
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Date of last data collection
Anticipated
8/09/2022
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Actual
23/04/2023
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Sample size
Target
30
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Accrual to date
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Final
30
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Recruitment outside Australia
Country [1]
24680
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Poland
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State/province [1]
24680
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Lower Silesia
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Funding & Sponsors
Funding source category [1]
311067
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University
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Name [1]
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Wroclaw University of Health and Sport Sciences, Poland
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Address [1]
311067
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Department of Biomechanics, Wroclaw University of Health and Sport Sciences, Mickiewicza 58 Street, 51-684 Wroclaw, Poland
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Country [1]
311067
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Poland
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Primary sponsor type
Individual
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Name
Arkadiusz Matras
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Address
Department of Biomechanics, Wroclaw University of Health and Sport Sciences, Mickiewicza 58 Street, 51-684 Wroclaw, Poland
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Country
Poland
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Secondary sponsor category [1]
312401
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None
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Name [1]
312401
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Address [1]
312401
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Country [1]
312401
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Ethics approval
Ethics application status
Approved
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Ethics committee name [1]
310611
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Senate Committee on Research Ethics of the Wroclaw University of Health and Sport Sciences, Wroclaw, Poland
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Ethics committee address [1]
310611
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Al. I.J. Paderewskiego 35, 51-612 Wroclaw, Poland
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Ethics committee country [1]
310611
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Poland
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Date submitted for ethics approval [1]
310611
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01/12/2021
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Approval date [1]
310611
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31/12/2021
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Ethics approval number [1]
310611
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18/2021
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Summary
Brief summary
Aim: Assessment of the effect of a rapid weight loss by approximately of 5% body mass on maximal strength capacity levels in powerlifters Research questions: 1. Is the body composition of powerlifters related to their maximum strength capabilities? 2. Are powerlifters' eating habits related to their maximum strength capabilities? 3. Is the use of a strategy leading to a rapid reduction of approximately 5% of body weight associated with a change in the assessment of perceived exertion during simulated powerlifting competitions? 4. Is the use of a strategy leading to a rapid reduction of approximately 5% of body weight associated with a change in mood? 5. Is the athletes' lifestyle related to their maximum strength capabilities? Research hypotheses: 1. The body composition of powerlifters is related to their maximum strength capabilities. 2. The eating habits of powerlifters are related to their maximum strength capabilities 3. The use of a strategy leading to a rapid weight loss approximately 5% is associated with a change in the assessment of perceived exertion during simulated powerlifting competitions. 4. Using a strategy leading to rapid weight loss by about 5% is associated with a change in mood. 5. The lifestyle of powerlifters is not related to their maximum strength capabilities Research intervention: 1. Implementation of a ketogenic diet, low-fiber diet, and dehydration to induce a rapid loss of 5% of body mass. 2. Application of a recuperation process between weigh-ins and simulated competitions consisting of consuming a bolus of 800 ml of Oral Rehydration Solution and then consuming 150% of the fluid weight they lost in the process of rapid weight reduction until the start of the simulated competition. All competitors consumed approximately 100 g of carbohydrates between body weight measurement and the start. During the simulated powerlifting competition, all participants had access to fluids and food ad libitum"
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Trial website
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Trial related presentations / publications
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Public notes
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Contacts
Principal investigator
Name
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Mr Arkadiusz Matras, MSc, PhDc
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Address
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Department of Biomechanics
Wroclaw University of Health and Sport Sciences
Mickiewicza 58 Street, 51-684 Wroclaw, Poland
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Country
118258
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Poland
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Phone
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+48782155621
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Fax
118258
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Email
118258
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[email protected]
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Contact person for public queries
Name
118259
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Arkadiusz Matras, MSc, PhDc
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Address
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Department of Biomechanics
Wroclaw University of Health and Sport Sciences
Mickiewicza 58 Street, 51-684 Wroclaw, Poland
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Country
118259
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Poland
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Phone
118259
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+48782155621
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Fax
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Email
118259
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[email protected]
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Contact person for scientific queries
Name
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Arkadiusz Matras, MSc, PhDc
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Address
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Department of Biomechanics
Wroclaw University of Health and Sport Sciences
Mickiewicza 58 Street, 51-684 Wroclaw, Poland
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Country
118260
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Poland
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Phone
118260
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+48782155621
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Fax
118260
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Email
118260
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[email protected]
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Data sharing statement
Will individual participant data (IPD) for this trial be available (including data dictionaries)?
Yes
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What data in particular will be shared?
Individual participant data underlying published results only
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When will data be available (start and end dates)?
Immediately the following publication on reasonable request (available for 5 years after publication)
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Available to whom?
Only to researchers who provide a methodologically relevant explanation
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Available for what types of analyses?
Only to achieve the purposes of the approved request
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How or where can data be obtained?
The data can be obtained by emailing the principal investigator (
[email protected]
)
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What supporting documents are/will be available?
No Supporting Document Provided
Results publications and other study-related documents
Documents added manually
No documents have been uploaded by study researchers.
Documents added automatically
No additional documents have been identified.
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