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    Acute electrical muscle stimulation effects on strength and anaerobic power in soccer players
    (Georg Thieme Verlag, 2025) Sofuoǧlu, Cem; Fujita, Rafael Akira; Keskin, Kadir; Kamış, Okan; Akçay, Neslihan
    Anaerobic power and lower limb muscle strength are of great importance in soccer, and various preloading strategies are used to improve these abilities. We investigated the acute effects of electrical muscle stimulation on muscle strength and anaerobic power in soccer players. Nineteen healthy male soccer players (age=21.1±1.6 y, training experience=10.1±3.2 y, height=178.1±4.0 cm, and body mass=8.9±3.7 kg) participated in the study. A placebo effect was created without telling the participants that which current (intensity) was applied. After the current applied to the quadriceps muscles, strength and anaerobic power tests were performed. Perceived exertion assessment was also collected after the performance tests. The 75 Hz current exhibited better performance in dominant (p <0.001 and d =0.75) quadriceps muscle group strength (kg). The 75 Hz current condition peak power had significantly higher values than 15 Hz (p <0.05 and d =0.38) and 104 Hz conditions (p <0.05 and d =0.60). Therefore, the 75 Hz current was the most successful in improving lower extremity strength and anaerobic power performances of soccer players. Future research should examine how to utilize sport-specific abilities related to strength and anaerobic power in soccer players for longer periods at peak.
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    Öğe
    Effects of different pre-exercise strategies on jumping performance in female volleyball players
    (Edizioni Minerva Medica, 2025) Keskin, Kadir; Akçay, Neslihan; Özmen, Tarık; Contarlı, Nurcan; Yıldız, Kerem C.; Sofuoğlu, Cem; Kamiş, Okan; Rolnick, Nicholas; de Queiros, Victor S.; Montoye, Alexander
    The present study aimed to compare different pre-exercise strategies on jumping performance in female volleyball players. METHODS: Fifteen healthy female volleyball players (age=18 +/- 0.6 years; training experience = 7.3 +/- 1.4 years; height = 164.8 +/- 5.4 cm; body mass = 57.2 +/- 8.1 kg) volunteered to participate in the study. Three different pre-exercise conditions (5 repetition maximum knee extension, electromyostimulation [EMS] and ischemic preconditioning [IPC]) were applied to the subjects and compared to a control condition performing a standardized warmup. Subjects performed the squat jump and 15 sec repeated countermovement jumps following a rest period. Measures associated with jumping performance were collected and compared between conditions. Rating of perceived exertion was also collected after each performance test. RESULTS: No pre-exercise condition outperformed a standardized warm-up on inducing improvements in jumping performance and in fact, EMS and IPC conditions resulted in performance decrements compared to control (P<0.05). CONCLUSIONS: We conclude that a standardized warm-up is enough to induce improvements in jumping performance in female volleyball players. Future research should examine alternative strategies alongside standardized warm-up to determine how best to prepare for jumping and related sport-specific tasks in female volleyball players.
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    Impact of limb occlusion pressure assessment position on performance, cardiovascular, and perceptual responses in blood flow restricted low-load resistance exercise: A randomized crossover trial
    (Taylor & Francis, 2024) Kamış, Okan; Rolnick, Nicholas; de Queiros, Victor S; Akçay, Neslihan; Keskin, Kadir; Yıldız, Kerem Can; Werner, Tim; Hughes, Luke; Sofuoğlu, Cem
    This study investigated the effect of limb occlusion pressure (LOP) position on exercise performance, cardiovascular responses, and perceptual experiences during seated bilateral leg extensions with and without blood flow restriction (BFR). Thirty resistance-trained males (age: 22?±?2?years; weight: 74.4?±?13.6?kg; height: 177.4?±?6.4?cm; BMI: 23.5?±?3.3?kg/m2) participated. Each performed exercise to failure (4 sets, 30% 1RM, 1?min rest) in three conditions: Supine LOP-BFR, Seated LOP-BFR, and no-BFR. BFR was applied at 60% LOP. Significant interaction effects were found for RPE (p?=?0.021, d?=?0.76), RPD (p?