Loading clinical trials...
Loading clinical trials...
Showing 1-7 of 7 trials
NCT07297771
This single-visit, laboratory study will quantify latissimus dorsi activation during standardized band/body-weight exercises commonly used in rehabilitation (e.g., standing bent-over row, inferior glide, seated press-up, body-lifting). Healthy, physically active adults (18-40 y; Tegner ≥5) will perform three repetitions per exercise with metronome-paced phases (≈3 s concentric, 3 s isometric, 3 s eccentric), 5-s rest between repetitions and 2-min between exercises; load will be individualized to reach OMNI RPE 6-8. Surface EMG (TeleMyo DTS; Noraxon) will be recorded from the latissimus dorsi (medial and lateral) and selected synergists (teres major, infraspinatus, posterior deltoid, triceps); electrode placement will follow SENIAM recommendations. Signals will be band-pass filtered (20-500 Hz), rectified, RMS-smoothed with a 100-ms window, and normalized to %MVIC using standardized MVC tests; exercise/MVC order will be randomized to limit bias. The primary outcome is mean normalized EMG amplitude per exercise; secondary outcomes include peak amplitude and categorical activation levels (low ≤20% MVIC, moderate 21-40%, high 41-60%, very high \>60%). The study involves minimal risk (possible mild skin irritation under electrodes and transient post-exercise fatigue).
NCT06982937
The goal of this study is to find out if one short set of heavy half-squats can help football players jump higher right away-and to understand what happens inside their muscles and nerves to make that boost happen. Key questions * Will performing 2-3 half-squats at 90% of one-rep max give a bigger jump boost than jogging on a treadmill for five minutes? * After each warm-up, how do muscle speed and stiffness, muscle size and fiber angle, and nerve signals change over the next 12 minutes? * Does each player's contribution of fast and slow muscle fibers affect how much and how long their jump improves? Study Plan Researches will invite 44 healthy football players, ages 18-21, who train regularly and meet our health rules. No one will know which warm-up each player does until the end. Participants will: * Get baseline tests of jump height, muscle speed and stiffness (using a harmless electrical sensor), muscle size and fiber angle (using ultrasound), and nerve signals (using sticky pads on the skin). * Be randomly assigned to either: 1. Heavy-squat group: 2-3 half-squats at 90% of their one-rep max 2. Jogging group: easy jog or walk on a treadmill for five minutes * Repeat all tests right after the warm-up and again at 4, 6, 8, 10, and 12 minutes to see how jump height and all muscle and nerve measures change over time. * Have their muscle fiber mix estimated from the first muscle-speed test to see if fiber type explains who gets the biggest jump boost. All tests are safe, painless, and approved by an ethics board. Players can stop at any time without giving a reason. This study will help athletes and coaches choose the best warm-up to get stronger, faster jumps right before a game or practice.
NCT06907914
This randomized controlled trial aims to investigate the effects of Schroth exercises on scapular muscle activation in children with thoracic hyperkyphosis. A total of 56 participants will be randomly assigned to either the Schroth exercise group or the control group receiving postural education. The intervention group will complete an 8-week supervised Schroth program focusing on three-dimensional correction, rotational breathing, and postural awareness. Primary outcome is scapular muscle activation measured by surface EMG. Secondary outcomes include muscle strength, scapular endurance, kyphotic appearance, posture, and pain. The results will guide clinical management and preventive strategies for children with postural thoracic hyperkyphosis.
NCT07123012
Key Findings (narrative form) The study examined how hamstring flexibility influences the way the lumbar spine and pelvis share movement during forward bending and how this affects muscle activity. 1. Flexibility and lumbar contribution When participants had tighter hamstrings, their lower back took on a larger share of the bending motion. In the full forward-bend task this relationship was strong, while in the partial bend it was still clearly evident. In other words, limited hamstring length forces the spine to bend more to reach the same position. 2. Meaningful flexibility thresholds Participants were divided into three straight-leg-raise (SLR) groups: * ≤ 60 ° (short hamstrings) * 61-79 ° (moderate flexibility) * ≥ 80 ° (good flexibility) Those in the ≤ 60 ° group showed a significantly higher lumbar contribution in both bending tasks than their more flexible peers. Once SLR exceeded roughly 60 °, additional gains in flexibility produced only modest further improvement in spine-pelvis balance, suggesting that 60 ° is a clinically important threshold. 3. When the differences appear The greatest gap between flexibility groups occurred during the first half of the bend-particularly as participants began to lean forward. As they returned to upright, the differences narrowed. This indicates that early-phase movement is the critical moment when tight hamstrings shift load onto the lumbar spine. 4. Impact on muscle activity Better hamstring flexibility was linked to a more even distribution of work between the lumbar extensor muscles and the hamstrings themselves. Participants with looser hamstrings did not have to activate their spinal muscles as forcefully, whereas gluteus maximus activity remained low in all groups because the tasks were unloaded. Practical Take-Aways * Hamstrings shorter than about 60 ° on the SLR "lock" the pelvis and make the lower back bend excessively, increasing spinal strain. * Improving hamstring length shifts motion back toward the pelvis, reducing demand on lumbar joints and muscles. * Even small everyday bends-such as reaching for an object on a chair-follow the same pattern, so stretching benefits daily life, not just sports performance. * Patients and families can adopt simple hamstring-stretch routines; clinicians should consider targeted flexibility training whenever SLR is 60 ° or below before progressing to heavy lifting or core-stability programs. Limitations The study involved healthy young adults and measured only unloaded forward bending. Outcomes may differ in older individuals, manual laborers, or tasks that involve twisting or weight. Long-term research is needed to confirm that stretching actually prevents low-back pain. Bottom Line Flexible hamstrings let the pelvis and lower back "share the job." If your hamstrings are tight, your spine must work harder, which may invite discomfort or injury over time. A regular stretching program that brings SLR above roughly 60 ° can restore a healthier, more balanced bending pattern and help protect the lower back.
NCT07106476
This study investigates the acute effects of single-leg squat exercises conducted under different attentional focus strategies (internal, external, and no focus) on plantar pressure distribution and posterior chain muscle activation in individuals with a history of unilateral ankle sprain. The study aims to determine whether external focus improves neuromuscular efficiency and postural control compared to internal or no attentional focus.
NCT04879901
To investigate change of shoulder muscles by measuring muscle activity according to the position of the backpack.
NCT01205542
Basic strength training for the neck/shoulder muscles can decrease intensity of neck/shoulder pain, but it is uncertain whether training should focus directly on the upper trapezius - which is most often tender - or on the lower compartments and serratus anterior. We hypothesize that strengthening exercise for the lower and middle trapezius as well as the serratus anterior will decrease intensity of neck/shoulder pain among office workers