Neuromuscular, Physiological and Performance Changes After an Acute and Chronic Training Protocol Associated to the Inter-set Velocity Loss
试验速览
- 阶段
- 不适用
- 发起方
- 入组人数
- 30
- 主要终点
- Contraction time
研究概览
简要总结
This study evaluates different performance, physiological and neuromuscular changes after acute and chronic resistance training intervention in physically active men. The participants will train with a single exercise (full squat) and will be monitored with a linear encoder. The experiment will consist of between 3 to 6 sets between 70% to 85% of 1RM in the full squat exercise. Two main groups will form the intervention: one group will perform inter-set repetitions until there will be a 20% of velocity loss compared to the first repetition, while the second group will have a 40% of velocity loss.
详细描述
The main dependent variables and instruments will be:
- Tensyomiography: neuromuscular properties of the vastus lateral (VL), rectus femoris (RF) and vastus medialis (VM) from the dominant leg.
- Force platform: kinetic variables in relation to a countermovement jump.
- Near-infrared spectrography: oxygen saturation in the VL and VM.
- Termographic camera: low limbs temperatura.
- Linear encoder: mean propulsive velocity from each repetition
- Electromyography: amplitude and frequency parameters related to a knee extension maximum voluntary contraction test.
- Strain gauge: maximum isometric force.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Other
- 盲法
- Single (Participant)
入排标准
- 年龄范围
- 18 Years 至 30 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •To be healthy
- •Without injuries or actual illnesses
- •More than 2 years of experience in resistance training or federative sports
排除标准
- •To be sick or injured
- •To have programmed during the intervention phase a dramatic change in the lifestyle
研究组 & 干预措施
20% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 20% less compared to the first repetition.
干预措施: Acute changes (Other)
20% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 20% less compared to the first repetition.
干预措施: Chronic changes (Other)
20% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 20% less compared to the first repetition.
干预措施: Familiarization (Other)
40% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 40% less compared to the first repetition.
干预措施: Acute changes (Other)
40% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 40% less compared to the first repetition.
干预措施: Chronic changes (Other)
40% velocity loss
This group will train with a variable number of repetitions during each set. The group will stop the set once the mean propulsive velocity will be 40% less compared to the first repetition.
干预措施: Familiarization (Other)
Control group
This group will be just tested as a control group.
干预措施: Chronic changes (Other)
Control group
This group will be just tested as a control group.
干预措施: Familiarization (Other)
结局指标
主要结局
Contraction time
时间窗: 7 weeks
Time between 10% to 90% on the displacement-time curve assessed with the Tensiomiograhpy
Maximum displacement
时间窗: 7 weeks
Maximum displacement point the displacement-time curve assessed with the Tensiomiograhpy
次要结局
- Muscle temperature(7 weeks)
- Muscle tissue oxygen(7 weeks)
- Peak isometric force(7 weeks)
- Kinetic variables in the jump(7 weeks)
- Mean propulsive velocity(7 weeks)
- Amplitude (RMS) and frequency outputs(7 weeks)
研究者
Alejandro Muñoz López
Associate Professor
University of Seville