Clinical Research Directory

Effects of Resistance Exercise Timing on Midday Muscle Performance in Athletes

This study investigated whether the timing of a resistance-based post-activation performance enhancement (PAPE) intervention performed during the morning influences muscle performance and muscle electrical activity during a standardized midday assessment in trained male athletes. Participants completed a control condition and three PAPE conditions performed at different times during the morning. The PAPE intervention consisted of back squat, kettlebell swing, and barbell hip thrust exercises. In all conditions, muscle performance was assessed between 12:00 and 12:15 using an isokinetic dynamometer, while surface electromyography (sEMG) of the rectus femoris muscle was recorded. The study compared relative peak torque and sEMG spectral power across the different PAPE timing conditions and the control condition.

Acute Effects of Vibration Versus High-Intensity Resistance Conditioning on Neuromuscular Performance

The purpose of this randomized crossover study was to compare the immediate effects of high-intensity resistance conditioning and whole-body vibration conditioning on lower- and upper-body neuromuscular performance in recreationally resistance-trained young adults. Twenty participants were enrolled, and 19 completed both experimental conditions. After a preliminary assessment and familiarization session, participants completed the resistance-conditioning and vibration-conditioning protocols in a randomized order during two experimental sessions separated by 24 hours. The resistance-conditioning protocol included three squat repetitions at 90% of estimated one-repetition maximum before countermovement jump testing and three bench-press repetitions at 90% of estimated one-repetition maximum before an isometric push-up assessment. The vibration-conditioning protocol included lower- and upper-body vibration exercises performed on a vibration platform before the corresponding performance assessments. Lower-body performance was assessed using countermovement jump height, flight time-to-contraction time ratio, and relative peak power. Upper-body performance was assessed using peak force during an isometric push-up. All performance outcomes were measured using dual force desks.

Event-Specific Adaptations to CrossFit and Running-Based HIIT in Elite Distance Runners at Moderate Altitude

The goal of this clinical trial is to compare the effects of two high-intensity training programs on physical performance and physiological adaptations in elite male middle- and long-distance runners aged 25 to 35 years who live and train at moderate altitude (approximately 1,400 meters above sea level). The main questions it aims to answer are: Does running-based high-intensity interval training improve aerobic fitness and race performance in elite distance runners? Does CrossFit training improve muscle strength, power, and physiological markers in elite distance runners? Researchers will compare running-based high-intensity interval training (HIIT) with CrossFit training to determine how each program affects aerobic capacity, strength, running performance, and selected blood markers. Participants will: Be randomly assigned to either a running-based HIIT program or a CrossFit training program Train five days per week for six weeks under supervision Complete exercise testing before and after the training period, including treadmill fitness testing and timed running trials Provide blood samples before and after the intervention to measure selected physiological markers