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NCT Number: NCT07835711

Strength Training in Archers

The aim of this study is to compare the acute effects of blood flow restriction resistance exercise, isotonic strengthening exercise, and neuromuscular electrical stimulation applied to the biceps brachii muscle in archery athletes. Volunteer athletes aged 18-45 years, who have been practicing archery for at least one year and have no health restrictions for exercise, will be included in the study. Participants will be divided into three groups and will perform one of the following interventions: blood flow restriction biceps curl, isotonic biceps curl, or NMES.

Warm-up and flexibility exercises will be performed before the interventions. In the blood flow restriction exercise group, a 30-15-15-15 repetition protocol will be performed with a low load under the determined arterial occlusion pressure. In the isotonic exercise group, 3 sets of 12-15 repetitions of biceps curl will be performed at 60-70% of 1-RM. In the NMES group, electrical stimulation will be applied to the biceps brachii muscle for 20 minutes at a frequency of 60 Hz, a pulse duration of 100 µs, and a 5-second contraction/5-second rest protocol.

Participants will be assessed before the intervention, immediately after the intervention, and 15 minutes after the intervention. The viscoelastic properties of the biceps brachii muscle will be assessed using Myoton® PRO; upper-extremity dynamic balance using the Y-Balance Test; upper-extremity endurance using the Modified Push-Up Endurance Test; stabilization using the Upper Extremity Stability Test; and reaction time using the Ruler Drop Test. In addition, demographic characteristics, dominant side, and perceived exertion level will be recorded. The acute effects of the three different interventions on biceps brachii muscle properties and upper-extremity performance parameters will be compared based on the results obtained.

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Key information

Conditions

Age range

18 year–45 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Istanbul Medipol Mega University Hospital

Istanbul, Turkey (Türkiye)

About this study

Hitting the target accurately is an indicator of athletic performance. Upper-extremity muscle strength, body position, shooting skill, hand-eye coordination, and respiratory parameters affect performance. Nishizono divided the archery shot into six phases: holding the bow, aiming, drawing, full draw, release, and follow-through. Maximum contraction of the upper-extremity muscles is required during shooting. The endurance and strength of the shoulder girdle muscles are particularly important during the aiming phase. In archery, repetitive movements place excessive loads on the upper extremities. When this sport is performed for prolonged periods with a unilateral stance, it may lead to asymmetry between the muscles on the right and left sides of the body. In addition, muscle weakness, improper technique, and overuse constitute risk factors for injuries. Strengthening exercises should therefore be an integral part of archery training programs to minimize injuries. Previous studies have reported that stronger muscle groups delay the onset of fatigue.

Numerous muscle groups are active during arrow shooting. Studies have investigated contraction and relaxation strategies of the forearm muscles in athletes with different skill levels using electromyographic (EMG) recordings. Ertan et al. classified muscle activation strategies into back muscles, shoulder girdle muscles, forearm muscles, and finger muscles. The deltoideus, trapezius, rhomboideus, serratus anterior, pectoralis major, triceps brachii-biceps brachii, flexor and extensor digitorum muscles, and muscles originating from the medial epicondyle have been found to be highly associated with shooting performance in previous studies. After the drawing phase begins, a large proportion of the effort is performed by the back and shoulder muscles. During the full-draw phase, the elbow of the bow arm is maintained in extension, and the elbow extensors are activated. In the drawing arm, the elbow is maintained in flexion, and the elbow flexors are activated. The biceps brachii muscle is actively involved in elbow flexion and supination during the aiming phase. Eccentric contraction of the biceps brachii muscle is a primary factor in maintaining force in the drawing arm. Throughout the aiming process, the drawing elbow is maintained in a flexed and stable position. Archers may reduce the risk of injury and improve performance by increasing the eccentric contraction strength of the biceps brachii muscle in the drawing arm.

Although archery may appear to require less effort compared with other sports, it requires prolonged high levels of concentration, postural control, strength, and endurance to meet the demands of training and competition. Strengthening exercises are exercises performed with resistance to increase muscle strength and endurance. Examples of strength-enhancing activities include carrying a weight, climbing stairs, performing push-ups for the arm muscles, performing sit-ups for the abdominal muscles, and strength training with weights. Various methods have been described in the literature for regulating muscle activation. While some of these methods target peripheral effects directly on the relevant muscle, others aim to achieve this through changes occurring in the central nervous system.

Studies investigating archery have focused on the back and shoulder girdle muscles. However, no studies specifically focusing on the biceps brachii muscle were identified. Given the importance of biceps brachii muscle strength during the full-draw phase, strengthening training programs targeting this muscle group will be implemented in our study. Through the strengthening training program, we aimed to investigate the acute effects on the viscoelastic properties of the biceps brachii muscle and on upper-extremity balance, endurance, stabilization, and reaction time.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Aged 18-45 years
  • Having no health problems or restrictions on exercise
  • Volunteering to participate in the study
  • Having practiced archery for at least 1 year

Exclusion criteria

  • Experiencing an injury during the study
  • Experiencing symptoms such as dizziness or chest pain during the study
  • Hypertension (blood pressure >140/90 mmHg)
  • Obesity (BMI ≥30 kg/m²)
  • Presence of varicose veins, deep vein thrombosis, or pulmonary embolism in the participant or a family history of these conditions

Treatment and study plan

Blood Flow Restriction Biceps Curl

Behavioral

Participants will perform biceps brachii curl exercise with blood flow restriction. The exercise will consist of 30, 15, 15, and 15 repetitions at 30% of 1-RM, with 30-45 seconds of rest between sets. Blood flow restriction pressure will be determined based on arterial occlusion pressure.

Isotonic Biceps Curl

Behavioral

Participants will perform isotonic biceps brachii curl exercise using resistance corresponding to 60-70% of 1-RM for 3 sets of 12-15 repetitions, with 60 seconds of rest between sets.

Neuromuscular Electrical Stimulation

Device

Participants will receive neuromuscular electrical stimulation targeting the biceps brachii muscle at 60 Hz frequency and 100 μs pulse duration, with 5 seconds of contraction and 5 seconds of rest for a total of 20 minutes.

Primary outcomes

  1. Biceps Brachii Muscle Stiffness

    Time frame: Baseline, immediately after intervention, and 15 minutes after intervention

    Biceps brachii muscle stiffness will be assessed using the MyotonPRO device. Measurements will be obtained at baseline, immediately after the intervention, and 15 minutes after the intervention. Muscle stiffness will be expressed in N/m.

Secondary outcomes

  1. Biceps Brachii Muscle Tone

    Time frame: Baseline, immediately after intervention, and 15 minutes after intervention.

    Biceps brachii muscle tone will be assessed using the MyotonPRO device. The measurement will be performed at the standardized measurement point on the biceps brachii muscle. Muscle tone will be expressed as the natural oscillation frequency in Hz.

  2. Biceps Brachii Muscle Elasticity

    Time frame: Baseline, immediately after the intervention, and 15 minutes after the intervention.

    The elasticity of the biceps brachii muscle will be assessed using the MyotonPRO device. Elasticity will be determined based on the logarithmic decrement of the natural oscillation and recorded as the MyotonPRO elasticity parameter.

  3. Upper Extremity Dynamic Balance

    Time frame: Baseline, immediately after the intervention, and 15 minutes after the intervention.

    Upper extremity dynamic balance will be assessed using the Upper Quarter Y-Balance Test. Participants will perform reaching tasks in the medial, superolateral, and inferolateral directions. The normalized composite score will be calculated based on the maximum reach distances and limb length. Higher scores indicate better dynamic balance performance.

  4. Upper Extremity Muscular Endurance

    Time frame: Baseline, immediately after the intervention, and 15 minutes after the intervention.

    Upper extremity muscular endurance will be assessed using the Modified Push-Up Endurance Test. Participants will perform as many correctly executed push-ups as possible during 30 seconds. The test will be performed three times with 45 seconds of rest between trials, and the mean number of repetitions will be recorded. A higher number of repetitions indicates better muscular endurance.

  5. Upper Extremity Stabilization

    Time frame: Baseline, immediately after the intervention, and 15 minutes after the intervention.

    Upper extremity stabilization will be assessed using the Upper Extremity Stabilization Test. Participants will perform repeated hand touches between two parallel lines positioned 90 cm apart during 15 seconds. The test will be repeated three times, and the mean number of correctly performed touches will be recorded. A higher score indicates better upper extremity stabilization performance.

  6. Upper Extremity Reaction Time

    Time frame: Baseline, immediately after the intervention, and 15 minutes after the intervention.

    Reaction time will be assessed using the Ruler Drop Test. Participants will catch a vertically released ruler as quickly as possible using the thumb and index finger. The distance traveled by the ruler before being caught will be recorded in centimeters. Reaction time will be calculated from the falling distance using the standardized gravitational acceleration formula. Lower reaction time indicates better performance.

  7. Rating of Perceived Exertion

    Time frame: Immediately after the intervention.

    Perceived exertion during the intervention will be assessed using the Borg CR10 scale. Participants will rate how difficult the intervention felt immediately after completing the exercise or stimulation protocol, with scores ranging from 0 to 10. Higher scores indicate greater perceived exertion.

Interested in participating?

Active, not recruiting

This study is active but is not currently recruiting participants.

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Sponsors and collaborators

Lead sponsor

Pınar ATAK ÇAKIR

Other

Collaborators

  • Medipol University

Registry information

Official study title

Acute Effects of Biceps Brachii Strengthening Training Applied to Archery Athletes Using Different Therapeutic Approaches: A Randomized Controlled Trial

Important dates

Study start
2025
Primary completion
2026
Study completion
2026
First posted
Sep 23, 2026
Registry last updated
Sep 23, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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