Resistance Exercise and Protein During Weight Loss
| Status: | Recruiting |
|---|---|
| Conditions: | Obesity Weight Loss |
| Therapuetic Areas: | Endocrinology |
| Healthy: | No |
| Age Range: | 19 - 30 |
| Updated: | 9/13/2018 |
| Start Date: | August 31, 2018 |
| End Date: | December 2019 |
| Contact: | Murphy |
| Email: | chaise.murphy@huskers.unl.edu |
| Phone: | 402 975 5580 |
Using Resistance Exercise and Protein Consumption to Protect Bone Health During Weight Loss
The purpose of this study is to determine if post-exercise protein supplementation can rescue
the anabolic response of muscle and bone to resistance exercise during caloric restriction.
the anabolic response of muscle and bone to resistance exercise during caloric restriction.
1. Preliminary Testing Prior to the study start, participants will be weighed and body
composition will be determined using bioimpedance analysis. Then participants will
undergo a 5RM barbell back squat exercise testing procedure.
2. Randomization
Participants will proceed through each of the following conditions lasting 3 days:
CON: Participants will be in energy balance and consume 1.2 g protein/kg BW/day.
Participants will be provided 30 g maltodextrin post-exercise.
CR+C: Participants will be restricted to 15 kcal/kg FFM/day and consume 1.2 g protein/kg
BW/day. Participants will be provided 30 g maltodextrin post-exercise.
CR+P: Participants will be restricted to 15 kcal/kg FFM/day and consume 1.2 g protein/kg
BW/day. Participants will be provided 30 g whey protein post-exercise.
3. Diet Prescription Dietary energy intake will be controlled using clinical products,
maltodextrin and whey protein isolate to meet target energy intakes. Participants will
receive calcium and Vitamin D supplementation throughout the study.
4. Exercise Prescription Participants will perform one bout of 5 sets of 5 repetitions of
barbell back squat exercise on the morning of Day 3 each condition. Additional exercise
and intense physical activity will be prohibited.
5. Assessments Body weight and composition (DXA + BIA), fasting blood draws for assessment
of metabolic and anabolic hormones and questionnaires will be conducted before and after
each condition. A 24-hour serial blood draw procedure will be conducted following each
workout session on each Day 3.
6. Washout Once a participant completes a study condition, participants will continue to
take daily body weights at home for up to one week. Then participants will be required
to wait one more week before completing their next condition during which they will
resume regular diet and physical activity.
composition will be determined using bioimpedance analysis. Then participants will
undergo a 5RM barbell back squat exercise testing procedure.
2. Randomization
Participants will proceed through each of the following conditions lasting 3 days:
CON: Participants will be in energy balance and consume 1.2 g protein/kg BW/day.
Participants will be provided 30 g maltodextrin post-exercise.
CR+C: Participants will be restricted to 15 kcal/kg FFM/day and consume 1.2 g protein/kg
BW/day. Participants will be provided 30 g maltodextrin post-exercise.
CR+P: Participants will be restricted to 15 kcal/kg FFM/day and consume 1.2 g protein/kg
BW/day. Participants will be provided 30 g whey protein post-exercise.
3. Diet Prescription Dietary energy intake will be controlled using clinical products,
maltodextrin and whey protein isolate to meet target energy intakes. Participants will
receive calcium and Vitamin D supplementation throughout the study.
4. Exercise Prescription Participants will perform one bout of 5 sets of 5 repetitions of
barbell back squat exercise on the morning of Day 3 each condition. Additional exercise
and intense physical activity will be prohibited.
5. Assessments Body weight and composition (DXA + BIA), fasting blood draws for assessment
of metabolic and anabolic hormones and questionnaires will be conducted before and after
each condition. A 24-hour serial blood draw procedure will be conducted following each
workout session on each Day 3.
6. Washout Once a participant completes a study condition, participants will continue to
take daily body weights at home for up to one week. Then participants will be required
to wait one more week before completing their next condition during which they will
resume regular diet and physical activity.
Baseline Inclusion Criteria:
- Weigh at least 110 lbs
- Weight-Stable (2.5 kg) within the past six months
- Height-Stable (< 0.25 inches) within the past year
- 3 years of resistance training experience
Tested Inclusion Criteria:
- <20% body fat (men) or <30% body fat (women)
Exclusion Criteria:
- Lactose intolerant
- Pregnancy
- Taking interfering medications such as steroids, thyroid or growth hormones
We found this trial at
1
site
Lincoln, Nebraska 68583
Phone: 402-472-7521
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