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Combined Effect of Exercise Intensity With Nutritional Supplementation on Skeletal Muscle Function

Not Applicable
Completed
Conditions
Skeletal Muscle Adaptations
Healthy Volunteers
Exercise Intensity
Neuromuscular Fatigue
Interventions
Dietary Supplement: Olive leaf extract
Dietary Supplement: Placebo
Registration Number
NCT05350566
Lead Sponsor
University of Lausanne
Brief Summary

The main objective of this study is to determine the effectiveness of a nutritional intervention (olive leaf extract) combined with a specific training session (MICT or SIT) on PDH activation (as well as other protein expressions) and exercise-induced muscle fatigue.

Detailed Description

Sprint interval training (SIT) is a form of interval training characterised by short bursts of intense exercise interspersed with rest periods. SIT is as, or more, effective than moderate intensity continuous training (MICT) for systemic and metabolic adaptations of muscles, despite a lower workload and shorter duration. However, the mechanisms underlying the metabolic response to SIT versus MICT are poorly understood. Our recent work (Zanou et al. 2021) suggests that increased pyruvate dehydrogenase (PDH) activity may explain why a SIT session led to greater changes in proteins involved in mitochondrial respiration compared to a MICT session.

Recently, it was found that a natural and commercially available compound based on olive leaf extract could stimulate resting mitochondrial bioenergetics by activating the mitochondrial calcium uniporter (MCU), which is involved in calcium transport across the mitochondrial membrane, directly controlling PDH activity. The main objective of this study is to determine the effectiveness of an acute nutritional intervention (olive leaf extract) combined with a specific training session (MICT or SIT) on PDH activation (as well as other protein expressions) and exercise-induced muscle fatigue.

Participants will be allocated to either a SIT (6 x 30 s all out sprints) or a MICT (1h at 50% maximal aerobic power) group and asked to come to the laboratory for five visits including one familiarization session with a triangular test for maximal aerobic power determination, the first experimental session during which they will realize the exercise with the product or a placebo and a session 24h after to assess skeletal muscle adaptations. Then after a 3 week wash-out period, they report to the laboratory for the fourth and fifth session, identical to the second and third sessions but with the other intervention (product or placebo). Muscle microbiopsies will be collected from the vastus lateralis muscle before, immediately after and 24 hours after exercise (MICT or SIT), while knee extensor neuromuscular function will be assessed at the same time points using voluntary and electrically-evoked contractions.

Recruitment & Eligibility

Status
COMPLETED
Sex
Male
Target Recruitment
25
Inclusion Criteria
  1. Being male (including females would necessitate increasing the number of included participants to consider sex as a variable which would burden the project too much).
  2. Being aged between 18 and 40 years
  3. Being healthy (The assessment will be done through a questionnaire and an interview/examination by a medical doctor if there is any doubts)
  4. Being physically active, but not involved in any structured training program
  5. Having stable dietary habits
Exclusion Criteria
  1. Having previous medical events that would put the participant at risk during the study
  2. Ingesting caffeine on the experimental days
  3. Not being currently treated for blood clotting problems
  4. Taking aspirin or anti-coagulant drugs in the 48 hours preceding the experimental days in which muscle samples will be collected
  5. Having allergy to xylocaine
  6. Having food allergy

Study & Design

Study Type
INTERVENTIONAL
Study Design
CROSSOVER
Arm && Interventions
GroupInterventionDescription
Sprint interval training group (SIT group)PlaceboThe model of sprint interval training (SIT) consists of six 30 s all-out cycling bouts on a cycle ergometer, with 4 min rests between tests.
Moderate intensity continuous training (MICT group)Olive leaf extractThe moderate intensity continuous training (MICT) consists of 1h cycling on a cycle ergometer at 50% of the maximal aerobic power output
Sprint interval training group (SIT group)Olive leaf extractThe model of sprint interval training (SIT) consists of six 30 s all-out cycling bouts on a cycle ergometer, with 4 min rests between tests.
Moderate intensity continuous training (MICT group)PlaceboThe moderate intensity continuous training (MICT) consists of 1h cycling on a cycle ergometer at 50% of the maximal aerobic power output
Primary Outcome Measures
NameTimeMethod
expression of OXPHOS proteinsbefore, immediately after and 24 hours after exercise completion

proteins used as markers of oxidative phosphorylation complexes

PDH dephosphorylationbefore, immediately after and 24 hours after exercise completion

protein involved in skeletal muscle metabolism

expression of MCU proteinbefore, immediately after and 24 hours after exercise completion

protein involved in the transport of Ca2+ in the mitochondria

Secondary Outcome Measures
NameTimeMethod
Voluntary activation levelbefore, immediately after and 24 hours after exercise completion

overall index of central fatigue induced by exercise

Peak doublet evoked at 100 Hzbefore, immediately after and 24 hours after exercise completion

overall index of peripheral fatigue induced by exercise

M-wave amplitudebefore, immediately after and 24 hours after exercise completion

index of neuromuscular excitability

Maximal voluntary contraction forcebefore, immediately after and 24 hours after exercise completion

Maximal force of the knee extensor muscles

Trial Locations

Locations (1)

Bâtiment Synathlon, quartier UNIL-Centre

🇨🇭

Lausanne, Switzerland

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