Acute Effects of High-Intensity Laser Therapy on Pain, Muscle Stiffness, and Grip Strength in Healthy Adults (HILT)
The goal of this clinical trial is to learn whether high-intensity laser therapy applied before exercise reduces the loss of handgrip strength, muscle stiffness, and pain after a tiring forearm exercise in healthy adults. This therapy delivers laser light through the skin to the underlying tissues.
The main questions this study aims to answer are:
Does laser therapy reduce the loss of handgrip strength after exercise compared with placebo treatment?
Does laser therapy reduce the increase in forearm muscle stiffness after exercise?
Does laser therapy reduce pain after exercise?
Researchers will compare active laser therapy with placebo laser treatment to assess whether the active treatment affects the muscles' response to exercise. Each participant will receive both treatments on separate visits. The order of treatments will be assigned by chance.
Participants will attend two laboratory visits at the Faculty of Health Sciences, University of Primorska, Slovenia. At one visit, they will receive active laser therapy over the muscles that bend the wrist in their dominant forearm. At the other visit, they will receive placebo treatment over the same area.
At each visit, participants will:
Rest before the initial measurements.
Have their handgrip strength, forearm muscle stiffness, and pain measured before treatment.
Receive active laser therapy or placebo treatment.
Wait five minutes before starting the exercise procedure.
Complete a wrist-strength test, then hold a muscle contraction at half of their maximum wrist-bending strength until they can no longer maintain the required force.
Have their handgrip strength, muscle stiffness, and pain measured again immediately after exercise and five and fifteen minutes later.
Handgrip strength will be measured by squeezing a handheld device. Muscle stiffness will be measured using a device that applies a brief, gentle mechanical tap to the skin over the muscle. Participants will rate their pain using a visual scale.
Participants will be asked to avoid strenuous physical activity for at least 24 hours before each visit and to keep their diet and regular supplement use similar before both visits.
The main outcome is the change in handgrip strength from before treatment to after exercise. Changes in muscle stiffness and pain will also be compared between the two treatments. Researchers expect active laser therapy to result in a smaller decrease in handgrip strength and smaller increases in muscle stiffness and pain than placebo treatment.
Panoramica dello studio
Stato
Intervento / Trattamento
Tipo di studio
Iscrizione (Stimato)
Fase
- Non applicabile
Contatti e Sedi
Contatto studio
- Nome: Denisa Manojlović Ivezić, PhD
- Numero di telefono: +385989394672
- Email: denisa.manojlovic@fvz.upr.si
Criteri di partecipazione
Criteri di ammissibilità
Età idonea allo studio
Accetta volontari sani
Sessi ammissibili allo studio
Descrizione
Inclusion Criteria:
- Healthy adults aged 18 to 40 years.
- Willingness to participate and provide written informed consent.
Exclusion Criteria:
- Acute or chronic injuries of the upper limbs.
- Neurological, musculoskeletal, or systemic diseases that could affect muscle function.
- Contraindications to high-intensity laser therapy.
Piano di studio
Come è strutturato lo studio?
Dettagli di progettazione
- Scopo principale: Prevenzione
- Assegnazione: Randomizzato
- Modello interventistico: Assegnazione incrociata
- Mascheramento: Nessuno (etichetta aperta)
Armi e interventi
Gruppo di partecipanti / Arm |
Intervento / Trattamento |
|---|---|
|
Sperimentale: Active HILT Followed by Placebo HILT
High-intensity laser therapy will be administered using the Platinum 4 device (Summus Medical Laser) over the wrist flexor muscles of the dominant forearm, from the medial epicondyle of the humerus toward the wrist. All four wavelengths available on the device will be used. Each participant will receive one active treatment session, followed by a five-minute interval before the muscle-fatiguing exercise procedure. Both the participant and the therapist will wear appropriate protective eyewear. |
High-intensity laser therapy will be administered using the Platinum 4 device (Summus Medical Laser) over the wrist flexor muscles of the dominant forearm, from the medial epicondyle of the humerus toward the wrist. All four wavelengths available on the device will be used. Each participant will receive one active treatment session, followed by a five-minute interval before the muscle-fatiguing exercise procedure. Both the participant and the therapist will wear appropriate protective eyewear. Placebo high-intensity laser therapy will be administered over the wrist flexor muscles of the dominant forearm before the same muscle-fatiguing exercise procedure used in the active treatment condition. Each participant will receive one placebo treatment session, followed by a five-minute interval before the exercise procedure. |
|
Comparatore fittizio: Sham HILT Followed by Placebo HILT
Sham high-intensity laser therapy will be administered over the wrist flexor muscles of the dominant forearm before the same muscle-fatiguing exercise procedure used in the active treatment condition. Each participant will receive one placebo treatment session, followed by a five-minute interval before the exercise procedure. |
High-intensity laser therapy will be administered using the Platinum 4 device (Summus Medical Laser) over the wrist flexor muscles of the dominant forearm, from the medial epicondyle of the humerus toward the wrist. All four wavelengths available on the device will be used. Each participant will receive one active treatment session, followed by a five-minute interval before the muscle-fatiguing exercise procedure. Both the participant and the therapist will wear appropriate protective eyewear. Placebo high-intensity laser therapy will be administered over the wrist flexor muscles of the dominant forearm before the same muscle-fatiguing exercise procedure used in the active treatment condition. Each participant will receive one placebo treatment session, followed by a five-minute interval before the exercise procedure. |
Cosa sta misurando lo studio?
Misure di risultato primarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
|
Handgrip Strength
Lasso di tempo: At each of the two study visits: before the intervention (baseline), immediately after the fatiguing exercise, and 5 and 15 minutes after the fatiguing exercise. Visits will be separated by at least one week.
|
Handgrip strength will be measured using a Baseline Lite handheld dynamometer on the dominant hand. Participants will be seated with the upper arm alongside the trunk, the elbow flexed to 90 degrees, the forearm in a neutral position, and the wrist in slight extension and ulnar deviation. Three maximal grip attempts will be performed at each assessment, and the highest value will be used for analysis. Changes from the pre-intervention baseline will be compared between active and placebo high-intensity laser therapy. |
At each of the two study visits: before the intervention (baseline), immediately after the fatiguing exercise, and 5 and 15 minutes after the fatiguing exercise. Visits will be separated by at least one week.
|
Misure di risultato secondarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
|---|---|---|
|
Wrist Flexor Muscle Stiffness
Lasso di tempo: At each of the two study visits: before the intervention (baseline), immediately after the fatiguing exercise, and 5 and 15 minutes after the fatiguing exercise. Visits will be separated by at least one week.
|
Muscle stiffness will be assessed using the MyotonPRO device at a predefined and marked anatomical measurement site over the wrist flexor muscles of the dominant forearm. The device applies a brief mechanical impulse to the skin and measures the tissue response to calculate muscle stiffness in newtons per meter (N/m). Higher values indicate greater stiffness. Changes from the pre-intervention baseline will be compared between active and placebo high-intensity laser therapy. |
At each of the two study visits: before the intervention (baseline), immediately after the fatiguing exercise, and 5 and 15 minutes after the fatiguing exercise. Visits will be separated by at least one week.
|
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Maggiori informazioni
Termini relativi a questo studio
Altri numeri di identificazione dello studio
- HILT effects_forearm
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