Effects of Increased Greek Yogurt Consumption in Youth and Young Adult Athletes

Trial statusRecruiting
Trial phaseNot applicable
Trial typeInterventional
Biological sexAll
Age15-22
SponsorBrock University

About this trial

Physical activity and dairy consumption during growth and development are each known to improve peak bone mass in young adults. Peak bone mass, the maximum amount of bone a person will have in their lifetime, is typically reached in the early 20's in females and late 20's in males. However, evidence suggests that young people do not consume enough dairy to maximize their bone mass. The resulting effect in peak bone mass can be troublesome, particularly for athletes, such as volleyball players. This study aims to determine whether increased dairy consumption combined with training can have an additive effect on the physiology of young competitive athletes. Specifically, we will examine whether Greek yogurt consumption will lead to beneficial changes in bone metabolism and inflammation, in adolescent and young adult, male and female athletes, similar to those observed with whey protein supplementation. Many athletes choose exclusively protein supplementation and miss out on other nutrients vital for healthy growth and development. By examining the benefits of Greek yogurt across different athlete age groups and sexes, this work will help reshape the attitudes, beliefs, and behaviours surrounding diet of young athletes.

Eligibility criteria

This trial accepts healthy volunteers

Qualifiers

Competitive youth or varsity athletes

Disqualifiers

Presence of injury

Inability to participate in practices

Allergy to dairy foods/dairy protein or

Diagnosis with lactose intolerance

Trial design

Design model

Parallel

Treatments tested in this trial

  • Greek yogurt

    Dietary supplement

    For 16 weeks, athletes will consume 2 servings/day of 175 g GY (0% MF, flavoured, 130 calories, 17 g protein, 225 g calcium; e.g., OIKOS High Protein GY)

  • Whey protein

    Dietary supplement

    For 16 weeks, athletes will consume 2 servings/day of 2/3 of a scoop of commercially available WP powder (flavoured, \~29 g, 120 calories, 19 g protein, 112.5 g calcium; e.g., PURE Whey Protein, Walmart)

Treatment groups

40 Participants
are divided into 2 treatment groups
Group A: Greek yogurt intervention group (GY)Experimental treatment 1 intervention
Group B: Whey protein intervention group (WP)Experimental treatment 1 intervention

Trial outcomes

Primary outcomes

1

Osteocalcin

Morning, fasted, resting serum levels of the bone remodelling marker osteocalcin (ng/ml)

Time frame
Baseline (week 0)
2

Osteocalcin

Morning, fasted, resting serum levels of the bone remodelling marker osteocalcin (ng/ml)

Time frame
End of control period and pre-intervention (week 8)
3

Osteocalcin

Morning, fasted, resting serum levels of the bone remodelling marker osteocalcin (ng/ml)

Time frame
Middle of intervention period (week 16)
4

Osteocalcin

Morning, fasted, resting serum levels of the bone remodelling marker osteocalcin (ng/ml)

Time frame
Completion of intervention period (week 24)

Secondary outcomes

1

Insulin-like growth factor 1 (IGF1)

Morning, fasted, resting plasma levels of IGF1 (ng/ml)

Time frame
Baseline (week 0)
2

Insulin-like growth factor 1 (IGF1)

Morning, fasted, resting plasma levels of IGF1 (ng/ml)

Time frame
End of control period and pre-intervention (week 8)
3

Insulin-like growth factor 1 (IGF1)

Morning, fasted, resting plasma levels of IGF1 (ng/ml)

Time frame
Middle of intervention period (week 16)
4

Insulin-like growth factor 1 (IGF1)

Morning, fasted, resting plasma levels of IGF1 (ng/ml)

Time frame
Completion of intervention period (week 24)

Other outcomes

Sponsors and contacts

Click on the lead sponsor to view all of their trials.

Brock University

Lead sponsor

York University

Collaborator