NCT03380195

Brief Summary

The purpose of this study was to determine the effects of a pre-exercise, single practical dose of watermelon juice, Gatorade, sugar water or water on heart rate recovery, blood lactate levels, and 24-hour post exercise muscle soreness.

Trial Health

77
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
27

participants targeted

Target at below P25 for not_applicable

Timeline
31mo left

Started Sep 2016

Longer than P75 for not_applicable

Geographic Reach
1 country

1 active site

Status
recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Progress79%
Sep 2016Dec 2028

Study Start

First participant enrolled

September 1, 2016

Completed
1.3 years until next milestone

First Submitted

Initial submission to the registry

December 11, 2017

Completed
10 days until next milestone

First Posted

Study publicly available on registry

December 21, 2017

Completed
11 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

December 1, 2028

Expected
Same day until next milestone

Study Completion

Last participant's last visit for all outcomes

December 1, 2028

Last Updated

January 21, 2026

Status Verified

January 1, 2026

Enrollment Period

12.3 years

First QC Date

December 11, 2017

Last Update Submit

January 16, 2026

Conditions

Heart Rate Recovery

Outcome Measures

Primary Outcomes (1)

  • Change of heart rate after submax exercise

    The participants then were fitted to cycling shoes and familiarized with the Lode cycle ergometer (Lode Excalibur Sport, Groningen, Netherlands), completed a warm-up and were asked to perform a criterion work rate trial ending at 80% predicted HRmax. Heart rate was recorded every minute post exercise for a maximum of 20 minutes post exercise.

    Baseline and every minute post exercise for a maximum 20 minutes post exercise.

Study Arms (4)

Watermelon juice

EXPERIMENTAL
Other: Watermelon juice

Sport drink

ACTIVE COMPARATOR
Other: Sport drink

Sugar water

ACTIVE COMPARATOR
Other: Sugar water

Water

PLACEBO COMPARATOR
Other: Water

Interventions

Watermelon juiceOTHER

Subject drinks 355ml of watermelon juice 1 hour prior to submaximal exercise

Watermelon juice
Sport drinkOTHER

Subject drinks 355ml of Gatorade 1 hour prior to submaximal exercise

Sport drink
Sugar waterOTHER

Subject drinks 355ml of sugar water (22.5g) 1 hour prior to submaximal exercise

Sugar water
WaterOTHER

Subject drinks 355ml of water 1 hour prior to submaximal exercise

Water

Eligibility Criteria

Age21 Years - 50 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64)

You may qualify if:

  • ages of 21-50 healthy adults

You may not qualify if:

  • Suffering from injury
  • Chronic inflammatory conditions
  • Required dietary supplement use
  • Required medication which affects blood pressure
  • Smoking
  • Pregnant woman
  • Allergy to watermelon

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Exercise and Nutritional Sciences, SDSU

San Diego, California, 92182-7251, United States

RECRUITING

MeSH Terms

Interventions

Water

Intervention Hierarchy (Ancestors)

HydroxidesAlkaliesInorganic ChemicalsAnionsIonsElectrolytesOxidesOxygen Compounds

Central Study Contacts

Mee Young Hong

CONTACT

619-594-2392mhong2@mail.sdsu.edu

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
NONE
Purpose
PREVENTION
Intervention Model
CROSSOVER
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

December 11, 2017

First Posted

December 21, 2017

Study Start

September 1, 2016

Primary Completion (Estimated)

December 1, 2028

Study Completion (Estimated)

December 1, 2028

Last Updated

January 21, 2026

Record last verified: 2026-01

Locations

US(1)