Levi da Silva Vendruscolo, Helderson Brendon, Victoria Hevia-Larraín, André Yui Aihara, Vitor de Salles Painelli
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Magnetic resonance imaging measured elbow flexor muscles cross-sectional area (EFCSA) pre- and post-training at 45%, 65%, and 85% of humerus length.</p><p><strong>Results: </strong>EFCSA significantly increased in both SHORT (<i>P</i> = 0.04) and LONG (<i>P</i> = 0.05) at 45% and 85% lengths (<i>P</i> < 0.01 for both). Changes in EFCSA between SHORT and LONG were statistically similar at the 45% (+6.20% vs +5.08%; Cohen <i>d</i> = 0.006; <i>P</i> = 0.98), 65% (+5.91% vs +3.83%, Cohen <i>d =</i> 0.28, <i>P</i> = 0.30), and 85% lengths (+8.51% vs +7.38%, Cohen <i>d =</i> 0.18,<i>P</i> = 0.56).</p><p><strong>Conclusion: </strong>Muscle hypertrophy of the elbow flexor muscles displayed a similar behavior after low-load elbow flexion training with vascular occlusion performed in the extended versus flexed shoulder position.</p><p><strong>Clinical relevance: </strong>Therapists, clinicians, and coaches may choose elbow flexion exercises expecting to achieve similar results for hypertrophy in this muscle group, such that exercise selection may rely on availability of equipment in the training room or personal preference.</p>","PeriodicalId":54276,"journal":{"name":"Sports Health-A Multidisciplinary Approach","volume":" ","pages":"19417381241287522"},"PeriodicalIF":2.7000,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11556575/pdf/","citationCount":"0","resultStr":"{\"title\":\"Similar Regional Hypertrophy of the Elbow Flexor Muscles in Response to Low-Load Training With Vascular Occlusion at Short Versus Long Muscle Lengths.\",\"authors\":\"Levi da Silva Vendruscolo, Helderson Brendon, Victoria Hevia-Larraín, André Yui Aihara, Vitor de Salles Painelli\",\"doi\":\"10.1177/19417381241287522\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>The regional hypertrophy response of elbow flexor muscles was compared after unilateral elbow flexion training in extended versus flexed shoulder position under vascular occlusion, which can induce muscle hypertrophy in the absence of muscle damage-induced edema/swelling.</p><p><strong>Hypothesis: </strong>Hypertrophy of elbow flexor muscles would be greater in extended compared with flexed shoulder position.</p><p><strong>Study design: </strong>Randomized within-subject trial.</p><p><strong>Level of evidence: </strong>Level 2.</p><p><strong>Methods: </strong>A total of 21 resistance-trained men (age, 25 ± 5 years; height, 1.78 ± 0.07 m; weight, 79.3 ± 13.1 kg) performed unilateral elbow flexions with one shoulder extended/elbow flexor muscles lengthened/long muscle length (LONG) and the other flexed/elbow flexor muscles shortened/short muscle length (SHORT) under a low-load (30% 1-repetition maximum) vascular occlusion training regimen (15 repetitions per set, 4 sets per session, 4 sessions per week for 3 weeks, using 80% of vascular occlusion pressure). Magnetic resonance imaging measured elbow flexor muscles cross-sectional area (EFCSA) pre- and post-training at 45%, 65%, and 85% of humerus length.</p><p><strong>Results: </strong>EFCSA significantly increased in both SHORT (<i>P</i> = 0.04) and LONG (<i>P</i> = 0.05) at 45% and 85% lengths (<i>P</i> < 0.01 for both). 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引用次数: 0
摘要
背景：在血管闭塞的情况下，单侧肘关节屈曲训练后，伸肩位与屈肩位肘关节屈曲肌肉的区域肥大反应进行了比较，在没有肌肉损伤引起的水肿/肿胀的情况下，血管闭塞可诱导肌肉肥大。假设：伸肩位与屈肩位肘关节屈曲肌肉的肥大反应更大：随机受试者试验：证据等级：2级：共有 21 名接受过阻力训练的男性（年龄，25 ± 5 岁；身高，1.78 ± 0.07 米；体重，79.3 ± 13.1 千克）进行了单侧屈肘运动。1公斤）在低负荷（30% 1次重复最大值）血管闭塞训练方案（每组重复15次，每次训练4组，每周4次训练，持续3周，使用80%的血管闭塞压力）下进行单侧屈肘训练，一侧肩膀伸直/屈肘肌拉长/肌肉长度变长（LONG），另一侧屈肘/屈肘肌缩短/肌肉长度变短（SHORT）。磁共振成像测量了训练前和训练后肱骨长度45%、65%和85%处的肘屈肌横截面积（EFCSA）：在肱骨长度为 45% 和 85% 时，短腿型（P = 0.04）和长腿型（P = 0.05）的肘屈肌横截面积都明显增加（两者的 P < 0.01）。在 45% 长度（+6.20% vs +5.08%；Cohen d = 0.006；P = 0.98）、65% 长度（+5.91% vs +3.83%，Cohen d = 0.28，P = 0.30）和 85% 长度（+8.51% vs +7.38%，Cohen d = 0.18，P = 0.56）时，短腿和长腿的 EFCSA 变化在统计学上相似：结论：在肩关节伸展位与屈曲位进行血管闭塞的低负荷屈肘训练后，屈肘肌的肌肉肥大表现相似：治疗师、临床医生和教练在选择肘关节屈伸训练时，可能会期望在这一肌肉群的肥大方面取得相似的效果，因此训练选择可能取决于训练室中是否有可用的设备或个人偏好。
Similar Regional Hypertrophy of the Elbow Flexor Muscles in Response to Low-Load Training With Vascular Occlusion at Short Versus Long Muscle Lengths.
Background: The regional hypertrophy response of elbow flexor muscles was compared after unilateral elbow flexion training in extended versus flexed shoulder position under vascular occlusion, which can induce muscle hypertrophy in the absence of muscle damage-induced edema/swelling.
Hypothesis: Hypertrophy of elbow flexor muscles would be greater in extended compared with flexed shoulder position.
Study design: Randomized within-subject trial.
Level of evidence: Level 2.
Methods: A total of 21 resistance-trained men (age, 25 ± 5 years; height, 1.78 ± 0.07 m; weight, 79.3 ± 13.1 kg) performed unilateral elbow flexions with one shoulder extended/elbow flexor muscles lengthened/long muscle length (LONG) and the other flexed/elbow flexor muscles shortened/short muscle length (SHORT) under a low-load (30% 1-repetition maximum) vascular occlusion training regimen (15 repetitions per set, 4 sets per session, 4 sessions per week for 3 weeks, using 80% of vascular occlusion pressure). Magnetic resonance imaging measured elbow flexor muscles cross-sectional area (EFCSA) pre- and post-training at 45%, 65%, and 85% of humerus length.
Results: EFCSA significantly increased in both SHORT (P = 0.04) and LONG (P = 0.05) at 45% and 85% lengths (P < 0.01 for both). Changes in EFCSA between SHORT and LONG were statistically similar at the 45% (+6.20% vs +5.08%; Cohen d = 0.006; P = 0.98), 65% (+5.91% vs +3.83%, Cohen d = 0.28, P = 0.30), and 85% lengths (+8.51% vs +7.38%, Cohen d = 0.18,P = 0.56).
Conclusion: Muscle hypertrophy of the elbow flexor muscles displayed a similar behavior after low-load elbow flexion training with vascular occlusion performed in the extended versus flexed shoulder position.
Clinical relevance: Therapists, clinicians, and coaches may choose elbow flexion exercises expecting to achieve similar results for hypertrophy in this muscle group, such that exercise selection may rely on availability of equipment in the training room or personal preference.
期刊介绍：
Sports Health: A Multidisciplinary Approach is an indispensable resource for all medical professionals involved in the training and care of the competitive or recreational athlete, including primary care physicians, orthopaedic surgeons, physical therapists, athletic trainers and other medical and health care professionals.
Published bimonthly, Sports Health is a collaborative publication from the American Orthopaedic Society for Sports Medicine (AOSSM), the American Medical Society for Sports Medicine (AMSSM), the National Athletic Trainers’ Association (NATA), and the Sports Physical Therapy Section (SPTS).
The journal publishes review articles, original research articles, case studies, images, short updates, legal briefs, editorials, and letters to the editor.
Topics include:
-Sports Injury and Treatment
-Care of the Athlete
-Athlete Rehabilitation
-Medical Issues in the Athlete
-Surgical Techniques in Sports Medicine
-Case Studies in Sports Medicine
-Images in Sports Medicine
-Legal Issues
-Pediatric Athletes
-General Sports Trauma
-Sports Psychology
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