Longrak R, Sonchan W, Jaidee W
Faculty of Sport Science, Burapha University, Chon Buri, Thailand.
Faculty of Medicine, Burapha University, Chon Buri, Thailand.
S Afr J Sports Med. 2024 Sep 15;36(1):v36i1a18549. doi: 10.17159/2078-516X/2024/v36i1a18549. eCollection 2024.
Resistance training often increases muscle size, a phenomenon known as muscle hypertrophy. These morphological adaptations were typically documented to occur in a non-uniform pattern. Investigating the specific morphological adaptations to different training programs was of interest.
This study aimed to investigate two resistance training programs, a high-intensity program (HI) and a combined high-intensity with low-intensity blood flow restriction program (MIX), on morphological adaptations of vastus lateralis muscle in healthy young men.
Eighteen active participants were recruited and randomly assigned to the HI (n = 10) or MIX (n = 8) groups, undergoing different 6-week resistance training programs. The training volume set was equated and progressively increased from three sets in weeks 1 and 2 to six sets, and eight sets in weeks 3-4 and 5-6, respectively. Three specific regions of vastus lateralis were assessed by magnetic resonance imaging (MRI) and ultrasound imaging (US) during pre-and post-intervention.
Statistical analysis revealed statistically significant increases in muscle area at the proximal (HI: Δ12%, MIX: Δ9.2%), middle (HI: Δ8.7%, MIX: Δ9.0%), and distal (HI: Δ14%, MIX: Δ13%) regions. Additionally, both HI and MIX groups showed statistically significant increases in the sum of muscle thickness post-intervention (HI: Δ12%, MIX: Δ19%) and in the sum of fascia thickness post-intervention (HI: Δ27%, MIX: Δ54%). Despite the MIX group training with higher volume load, no statistical differences were observed between groups for any week.
These findings suggested that both HI and MIX programs effectively induced increases in muscle area and sums of muscle and fascia thickness in healthy young men, allowing practitioners to choose either program based on individual preferences and constraints.
阻力训练通常会增加肌肉大小，这一现象被称为肌肉肥大。这些形态学适应通常被记录为以非均匀模式发生。研究不同训练计划的特定形态学适应情况很有意义。
本研究旨在调查两种阻力训练计划，即高强度计划（HI）和高强度与低强度血流限制相结合的计划（MIX），对健康年轻男性股外侧肌形态学适应的影响。
招募了18名活跃参与者，并随机分配到HI组（n = 10）或MIX组（n = 8），进行为期6周的不同阻力训练计划。训练量设定相等，并从第1周和第2周的三组逐渐增加到第3 - 4周的六组，以及第5 - 6周的八组。在干预前后，通过磁共振成像（MRI）和超声成像（US）评估股外侧肌的三个特定区域。
统计分析显示，近端（HI：Δ12%，MIX：Δ9.2%）、中部（HI：Δ8.7%，MIX：Δ9.0%）和远端（HI：Δ14%，MIX：Δ13%）区域的肌肉面积有统计学显著增加。此外，HI组和MIX组在干预后肌肉厚度总和（HI：Δ12%，MIX：Δ19%）和筋膜厚度总和（HI：Δ27%，MIX：Δ54%）方面均有统计学显著增加。尽管MIX组以更高的体积负荷进行训练，但在任何一周组间均未观察到统计学差异。
这些发现表明，HI和MIX计划均能有效诱导健康年轻男性肌肉面积以及肌肉和筋膜厚度总和增加，从业者可根据个人偏好和限制选择任一计划。
