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Physical PerformanceNCT07461194

Timing of Broccoli Sprout Intake to Improve Exercise Performance

A study testing Broccoli sprout drink (isothiocyanate-rich in people with Physical Performance and Glucose, run by The Swedish School of Sport and Health Sciences at 1 site in Sweden.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This study examines how the timing of intake of a broccoli sprout-based drink (a natural source of isothiocyanates, ITCs) affects physiological responses, recovery, and performance after a standardized endurance cycling session. Read more about this study

Who is it for?
Ages 18 to 50 yearsHealthy volunteers can take part
Conditions the study is for
Physical Performance, Glucose, Glycogen Metabolism
What is being tested?
Broccoli sprout drink (isothiocyanate-rich
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
30 participants
Where
1 siteSweden
Study dates
15 Aug 2026to 1 Sep 2028
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 50 years
  • All sexes
  • Healthy volunteers accepted
  • Adult

Who may be able to join

  • Healthy, endurance-trained adults aged 18-64 years.
  • Regular endurance training (e.g., cycling/running) and ability to complete a standardized 2-hour high-intensity cycling session on an ergometer.
  • Approved health declaration and screening assessment by study staff (including that ergometer testing can be performed safely).
  • Willing and able to follow the study protocol (diet/fasting instructions, standardized training before visits, attendance at all four laboratory visits).
  • No known allergy/hypersensitivity to ingredients in the broccoli sprout drink or placebo drink.

Who cannot join

  • Does not meet inclusion criteria at screening (e.g., abnormal health declaration or medical findings making intense endurance exercise or muscle biopsy inappropriate).
  • Known allergy/hypersensitivity to ingredients in the intervention or placebo drink (broccoli/cruciferous vegetables or alfalfa) or other relevant food allergy.
  • Ongoing illness, fever, or infection at any test occasion, or other acute medical event judged to affect safety or data quality.
  • Ongoing treatment with medications/supplements judged to affect primary outcomes or increase risk (e.g., anti-inflammatory medication close to test days per study instructions).
  • Pregnancy (if women are included) or breastfeeding.
  • Inability to comply with the study protocol (e.g., failure to standardize diet/fasting, deviating training/alcohol intake despite instructions, or repeated missed visits).
  • Participant withdraws consent or investigator judges continued participation to pose risk.
  • -

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Filip J Larsen, PhD contact

08-120 53 700

filip.larsen@gih.se

Sweden1 site, 1 recruiting
  • Swedish School of Sport and Health Sciences

    Stockholm, Stockholm County, 11433

    Recruiting

Other trials in Sweden

About this study

Official title: Effects of Acute and Subacute Intake of Broccoli Sprouts Intake on Exercise Performance and Recovery

This study examines how the timing of intake of a broccoli sprout-based drink (a natural source of isothiocyanates, ITCs) affects physiological responses, recovery, and performance after a standardized endurance cycling session. Healthy, endurance-trained adults (18-64 years) will complete four laboratory visits at the Swedish School of Sport and Health Sciences (GIH): one screening/physiology test visit and three intervention visits in a randomized, double-blind, placebo-controlled cross-over design. On intervention visits, participants will ingest either an active broccoli sprout drink (50 g sprouts) or a placebo drink based on alfalfa sprouts (50 g sprouts) according to randomization. The drink will be consumed either approximately 16 hours before exercise (the evening before) or approximately 3 hours before exercise (the morning of the test), enabling comparison of timing in relation to a standardized ~2-hour cycling protocol (individualized intensity) followed by a 10 km cycling time trial. Outcomes include measures of performance, heart rate, perceived exertion and recovery, blood glucose and lactate, and metabolic responses. Venous blood samples are collected at multiple time points before and after exercise and during the subsequent laboratory recovery period, and muscle biopsies are obtained at defined time points to assess muscle metabolism and recovery-related markers. Participants return ~24 hours after exercise for follow-up sampling after an overnight fast, including a glucose tolerance test

Read the detailed description

This is a randomized, double-blind, placebo-controlled cross-over study conducted at the Swedish School of Sport and Health Sciences (GIH), Stockholm, designed to isolate the effect of timing of isothiocyanate (ITC) intake from broccoli sprouts on exercise responses, recovery, and cycling performance. Each participant completes four laboratory visits: one screening/physiology visit and three intervention visits. The screening visit includes a health check and an incremental cycle test to determine maximal oxygen uptake and to individualize exercise intensities for subsequent visits; oxygen uptake is assessed by indirect calorimetry, and capillary fingertip samples are used to measure blood lactate and glucose during the test. A venous blood sample is collected at the screening visit.

Intervention visits (three separate occasions) follow the same standardized test-day structure with different drink assignments according to randomization. The active drink consists of 50 g broccoli sprouts (ITC source) and the placebo drink consists of 50 g alfalfa sprouts. Drinks are administered to compare "subacute" intake (approximately 16 hours before exercise, the evening prior) versus "acute" intake (approximately 3 hours before exercise, the morning of the test day). The three intervention conditions are: (1) placebo at ~16 h plus placebo at ~3 h before the cycling protocol (control), (2) active at ~16 h plus placebo at ~3 h (subacute condition), and (3) placebo at ~16 h plus active at ~3 h (acute condition). Participants and investigators/test staff are blinded to drink identity at each visit.

On each intervention test day, participants arrive to the laboratory (approximately 08:30) and compliance with pre-visit instructions is checked. Baseline samples are collected, including a muscle biopsy from vastus lateralis, venous blood, and saliva. Participants then complete a standardized, strenuous cycling protocol on an ergometer with individualized intensity based on the screening test (approximately 80% of VO2max). An example structure is repeated intervals around lactate threshold (e.g., 8 × 5 min work with short recovery), with physiological monitoring throughout. Heart rate is recorded continuously (smartwatch), and capillary blood lactate and glucose are measured at predefined time points during exercise. Oxygen uptake/energy metabolism may be monitored during portions of the protocol using indirect calorimetry.

The exercise protocol includes a 10 km cycling performance test on the ergometer. In addition, approximately 4 hours after completion of the initial cycling bout (and following the relevant sampling time point), participants perform a second 10 km ergometer time trial in which they are instructed to perform as well as possible. Perceived exertion is recorded during exercise, and perceived recovery is assessed during the recovery period (e.g., Perceived Recovery Status Scale).

Biological sampling is extensive to characterize acute and post-exercise recovery processes. At each intervention visit, venous blood is collected at 10 time points: pre-exercise, immediately post-exercise, and then once per hour during the subsequent 8-hour laboratory recovery period (approximately 4 mL per draw; ~40 mL per intervention visit). Muscle biopsies from vastus lateralis are collected at four time points per intervention visit: pre-exercise, immediately post-exercise, approximately 4 hours post-exercise, and approximately 24 hours post-exercise (separate incision sites; predetermined/randomized leg). Saliva sampling is also performed (including at baseline and at the end of the ~8-hour laboratory recovery period). During the 0-8 hour recovery period in the laboratory, standardized meals are provided.

After approximately 8 hours in the laboratory, participants leave and return the next day (~24 hours after exercise) for final sampling, including the last muscle biopsy. For the 24-hour visit, participants fast for at least 10 hours. A glucose tolerance test is performed at the 24-hour follow-up to assess post-exercise glucose regulation.

Being tested
Broccoli sprout drink (isothiocyanate-rich, Placebo drink
Keywords
Broccoli Sprouts, Lactate, Exercise, Glycogen, Isothiocyanate
Medical subject headings
Motor Activity

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Broccoli sprout drink (isothiocyanate-richDietary supplement

    Active intervention is a drink prepared from broccoli sprouts (50 g per dose) as a natural source of glucosinolates/isothiocyanates (ITCs). Participants ingest the drink either ~16 hours before the exercise session (evening prior) or ~3 hours before the exercise session (test day morning), depending on randomized condition. The study compares the timing of ITC intake versus placebo, with identical procedures across conditions.

  • Placebo drinkDietary supplement

    The placebo intervention is a drink prepared from alfalfa sprouts (50g per dose) as a placebo. Participants ingest the drink at both ~16 hours before the exercise session (evening prior) and ~3 hours before the exercise session (test day morning). The study compares the timing of ITC intake versus placebo, with identical procedures across conditions.

Study groups in NCT07461194
Study groupRoleWhat they receive
placeboPlacebo comparatorParticipants ingest placebo drink prepared from alfalfa sprouts (50 g) ~16 hours before exercise (evening prior) and placebo drink (50 g) ~3 hours before exercise (test day morning). Exercise protocol and sampling are identical to other conditions.
Receives: Dietary Supplement: Placebo drink
active, ~16 hours pre exerciseExperimentalParticipants ingest broccoli sprout drink (isothiocyanate-rich; 50 g sprouts) ~16 hours before exercise and placebo alfalfa sprout drink (50 g) ~3 hours before exercise. Exercise protocol and sampling are identical to other conditions.
Receives: Dietary Supplement: Broccoli sprout drink (isothiocyanate-rich
active, ~3 hours pre exerciseExperimentalParticipants ingest placebo alfalfa sprout drink (50 g) ~16 hours before exercise and broccoli sprout drink (isothiocyanate-rich; 50 g sprouts) ~3 hours before exercise. Exercise protocol and sampling are identical to other conditions.
Receives: Dietary Supplement: Broccoli sprout drink (isothiocyanate-rich

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Lactate

    blood lactate (mmol/L) at predefined time points during exercise; venous sampling schedule as per protocol.

    Measured: During exercise and across the 0 to 8 hours recovery period (hourly venous samples), and at the follow-up, approximately 24 hours post-exercise.

  2. Glucose

    Blood glucose (mmol/L) at predefined time points during exercise; venous sampling schedule as per protocol.

    Measured: During exercise and across the 0 to 8 hours recovery period (hourly venous samples), and at the follow-up, approximately 24 hours post-exercise.

  3. Glycogen

    Muscle glycogen content in the vastus lateralis obtained from biopsies at pre-exercise, immediately post-exercise, 8 hours post-exercise, and 24 hours post-exercise to quantify glycogen depletion during exercise and repletion during recovery

    Measured: Before exercise, immediately post-exercise, 8 hours post-exercise, and 24 hours post-exercise

Secondary outcomes (1)
  1. Physical performance

    Time to complete the approximately 10-kilometer cycling time trial on an ergometer

    Measured: Twice per visit. First, immediately following the standardized cycling protocol, and second, 4 hours post-exercise during the same intervention visit.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted10 Mar 2026
  2. Study start15 Aug 2026
  3. Primary completion31 Dec 2027 (estimated)
  4. Study completion1 Sep 2028 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Basic science
Allocation
Randomised
Intervention model
Crossover
Masking
Double blind
Who is masked
Participant, Investigator
Enrolment
30 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07461194
Sponsor's protocol ID
ITC-2026-001
Status last verified
Oct 2026
First submitted
25 Feb 2026
Last updated
14 Oct 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: De-identified individual participant data (IPD) underlying the primary and secondary outcomes (and associated data dictionary/codebook) will be made available to qualified researchers upon reasonable request after publication of the primary results. Data will be shared in a de-identified form in accordance with Swedish/EU data protection regulations and the approved ethics application. Requests will be reviewed by the study investigators; data sharing may require a data use agreement and proof of ethical approval where applicable

Questions about this trial

What is this clinical trial studying?

A study testing Broccoli sprout drink (isothiocyanate-rich in people with Physical Performance and Glucose, run by The Swedish School of Sport and Health Sciences at 1 site in Sweden.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 5 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 14 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Sweden. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Filip J Larsen, PhD (08-120 53 700, filip.larsen@gih.se), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Lactate (time frame: During exercise and across the 0 to 8 hours recovery period (hourly venous samples), and at the follow-up, approximately 24 hours post-exercise.). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 14 Oct 2026.

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