Isokinetic Test, Muscle Strength
Conditions
Brief summary
The primary aim of the current study is determine the effect of beetroot juice consumption on neuromuscular activation, isokinetic muscle strength and power
Detailed description
Participants completed two experimental sessions in a randomized, double-blind, placebo-controlled crossover design separated by a minimum 3-day washout period. Prior to each session, participants were instructed to avoid nitrate-rich foods, strenuous exercise, antibacterial mouthwash, chewing gum, and tooth brushing. All testing sessions were performed in the morning following an overnight fast. Upon arrival, anthropometric measurements were obtained and participants consumed either a nitrate-rich beetroot juice supplement (highNO) or nitrate-depleted placebo (lowNO). Following a standardized 2-hour absorption period, surface EMG electrodes were placed on the vastus medialis oblique (VMO) and vastus lateralis oblique (VLO) muscles according to SENIAM guidelines. Capillary blood samples were collected before exercise and 3 minutes after the fatigue protocol for blood lactate assessment. Participants then completed a standardized 10-minute warm-up followed by isokinetic testing using a Biodex dynamometer. Testing was performed on the dominant lower limb at angular velocities of 180°/s, 60°/s, and 240°/s. Three maximal repetitions were performed at 60°/s and 180°/s, while a 30-repetition fatigue protocol was completed at 240°/s. Outcome measures included peak torque, peak power, total work, torque-angle variables, EMG activity, and blood lactate concentration.
Interventions
DIETARY_SUPPLEMENTBeetroot juice
acute dose of beetroot juice
DIETARY_SUPPLEMENTPlacebo
depleted nitrate beetroot juice
Sponsors
Poznan University of Physical Education
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
DIAGNOSTIC
Masking
NONE
Eligibility
Sex/Gender
MALE
Age
18 Years to 35 Years
Healthy volunteers
Yes
Inclusion criteria
* age ≥18 years, * participation in at least three structured training sessions per week, * absence of musculoskeletal injuries within the previous 12 months
Exclusion criteria
* smoking, * any injury within the past year
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The effect of beetroot juice ingestion on isokinetic strength | 2 hours | The aim of the present study was to examine the effects of acute ignestion of nitrate rich suplement compared with placebo on isokinetic muscle performance during knee extension and flexion tasks performed using an isokinetic dynamometer. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| The effect of Beetroot Juice consumption on EMG muscle activity | 2 hours | Neuromuscular activity was assessed using surface electromyography of the vastus medialis oblique and vastus lateralis oblique muscles while Isokinetic tests |
Countries
Poland
Contacts
PRINCIPAL_INVESTIGATORRobert Olek, Prof
Poznan University of Physical Education
Outcome results
None listed