This study aims to investigate the effects of blood flow restriction (BFR) applied during jump squat exercises on selected performance parameters in elite volleyball players. Prior to each training session, all participants followed a standardized warm-up protocol that included dynamic stretching, mobility exercises, and general body activation to prepare for the workout. Following this preparation phase, the jump squat exercises were performed. Participants were randomly assigned to two groups. The experimental group performed the jump squats under blood flow restriction using a manually controlled, non-automated tourniquet, while the control group performed the same exercises without any restriction. Performance parameters were assessed before and after the 4-week intervention using the following measurement tools: Jump performance: Measured using the Optojump system Agility: Assessed with the Hexagon Agility Test Balance: Evaluated using the Y Balance Test Perceived fatigue: Measured via the Borg Rating of Perceived Exertion (RPE) scale The purpose of the study is to determine whether jump squat exercises performed under BFR conditions can lead to greater improvements in athletic performance and perceived fatigue compared to traditional training methods. The study was conducted using equipment provided by Bahçeşehir University and included licensed volleyball players from Süreyyapaşa Sports Club. The research protocol was approved by the Non-Interventional Research Ethics Committee of Üsküdar University.
This study aims to investigate the effects of jump squat exercises performed with the blood flow restriction (BFR) method on jump performance, agility, balance, and perceived fatigue in volleyball players. The effectiveness of the BFR method on these performance parameters was evaluated in comparison to classical training methods. The study was conducted on 22 male volleyball players actively training at Süreyyapaşa Sports Club, who had similar age and training backgrounds. Participants were randomly assigned into two equal groups of 11: the experimental group (BFR group), which performed jump squats with blood flow restriction, and the control group, which performed the same exercises without restriction. All participants followed the same exercise protocol for four weeks, training three times per week. Before each training session, a standardized warm-up routine including dynamic stretching, mobility, and general activation exercises was applied. Following the warm-up, participants performed jump squat exercises in 3 sets of 10 repetitions. In the BFR group, a manually adjustable, non-automated tourniquet device was applied to the proximal region of both thighs during the exercise. This partially maintained arterial flow while restricting venous return, thereby creating a hypoxic environment in the target muscles. No tourniquet was used in the control group. Pre- and post-intervention assessments were performed using the following measurement tools: Jump performance was measured using the Optojump system to assess vertical jump height. Agility was assessed with the Hexagon Agility Test. Balance was evaluated using the Y Balance Test, targeting lower extremity stability. Perceived fatigue was recorded using the Borg Rating of Perceived Exertion (RPE) scale. The aim of this study was to comparatively evaluate the performance outcomes of jump squat exercises with and without BFR in trained volleyball players. Data were statistically analyzed to determine whether the inclusion of BFR provided measurable benefits in terms of explosive strength, agility, balance, and fatigue. The findings of this study are expected to contribute to the development of safer and more effective training protocols for improving athletic performance. This research was approved by the Üsküdar University Non-Interventional Research Ethics Committee. All measurement and test devices used in the study were provided by Bahçeşehir University. The training sessions were carried out using the infrastructure of the Süreyyapaşa Sports Club.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
NONE
Enrollment
22
This intervention consisted of jump squat exercises performed with blood flow restriction applied using a non-automated, manually adjustable tourniquet placed on the proximal thighs. The restriction was applied during the exercise to partially limit venous return while maintaining arterial flow. The exercise protocol included 3 sets of 10 repetitions, performed 3 times per week for 4 weeks. A standardized warm-up preceded each session.
This intervention consisted of the same jump squat protocol as the experimental group but without the application of blood flow restriction. Participants performed 3 sets of 10 repetitions, 3 times per week for 4 weeks. Each session was preceded by a standardized warm-up routine that included dynamic stretching and general activation exercises.
Süreyyapaşa Sports Club
Istanbul, Maltepe, Turkey (Türkiye)
Vertical Jump Height
Vertical jump height was measured using the Optojump Next System. The system records jump height in centimeters based on flight time. Higher values indicate better performance (higher jump). There is no fixed maximum value, as the outcome depends on individual athletic ability.
Time frame: Baseline and post-intervention (after 4 weeks of training)
Agility (Hexagon Agility Test)
Agility was assessed using the Hexagon Agility Test. The total time to complete the test was recorded in seconds. Lower times indicate better performance (better outcome). There is no fixed minimum, but the theoretical minimum would approach zero; no upper limit is predefined.
Time frame: Baseline and post-intervention (after 4 weeks of training)
Dynamic Balance (Y Balance Test)
Balance was evaluated using the Y Balance Test for the lower extremity. Reach distances were measured in centimeters for each leg in anterior, posteromedial, and posterolateral directions. Higher scores indicate better balance (better outcome). There is no fixed maximum value as it depends on individual performance.
Time frame: Baseline and post-intervention (after 4 weeks of training)
Perceived Fatigue (Borg RPE Scale)
Perceived fatigue was measured using the Borg Rating of Perceived Exertion (RPE) Scale, which ranges from 6 to 20, where higher scores indicate greater perceived exertion (worse outcome). Participants reported their perceived level of exertion before and after the 4-week intervention (pre- and post-intervention measurements).
Time frame: Baseline and post-intervention (after 4 weeks of training)
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