Acute Effects of Proprioceptive Neuromuscular Facilitation and Static Stretching on Hamstring-to-Quadriceps Strength Ratio in Healthy Young Men
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 23
- 试验地点
- 1
- 主要终点
- Hamstring-to-Quadriceps (H/Q) Ratio
研究概览
简要总结
This study aimed to compare the acute effects of proprioceptive neuromuscular facilitation (PNF) and static stretching on hamstring-to-quadriceps (H/Q) strength ratios in healthy young men. A randomized crossover design was used in which participants completed both stretching protocols on separate days. Isokinetic muscle strength and H/Q ratios were assessed following each intervention. The findings provide insight into the immediate effects of different stretching modalities on muscle balance and performance.
详细描述
The present study investigated the acute effects of two commonly used stretching modalities-proprioceptive neuromuscular facilitation (PNF) and static stretching-on isokinetic muscle strength and hamstring-to-quadriceps (H/Q) ratios in physically active healthy young males. The study employed a randomized crossover design with repeated measures, allowing each participant to complete both experimental conditions under standardized laboratory settings.
Participants attended three sessions: a familiarization session followed by two experimental sessions separated by at least 48 hours. Each experimental session included a standardized warm-up, followed by either PNF or static stretching intervention, and subsequent isokinetic strength testing. Peak torque values for quadriceps (concentric) and hamstrings (concentric and eccentric) were measured using an isokinetic dynamometer at 60°/s. Traditional and functional H/Q ratios were calculated.
The primary aim was to determine whether these stretching modalities produce acute alterations in muscle strength and H/Q ratios. The study also examined whether the type of ratio (traditional vs. functional) significantly influences outcomes. Findings contribute to understanding the neuromuscular implications of stretching in warm-up protocols.
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
- None
入排标准
- 年龄范围
- 18 Years 至 25 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Age between 18 - 25 years, healthy male individuals
- •Physically active (≥3 days/week, ≥30 min/day)
排除标准
- •Musculoskeletal injury in the last 6 months
- •Any neurological or orthopedic disorder
研究组 & 干预措施
PNF Stretching
Participants performed four repetitions of PNF stretching consisting of a 6-second isometric hamstring contraction at approximately 60% of maximal voluntary contraction followed by a 30-second passive stretch. Rest intervals were standardized.
干预措施: Static Stretching (Other)
PNF Stretching
Participants performed four repetitions of PNF stretching consisting of a 6-second isometric hamstring contraction at approximately 60% of maximal voluntary contraction followed by a 30-second passive stretch. Rest intervals were standardized.
干预措施: PNF Stretching (Other)
Static Stretching
Participants performed four repetitions of static hamstring stretching, each lasting 30 seconds, with 30-second rest intervals between repetitions
干预措施: PNF Stretching (Other)
Static Stretching
Participants performed four repetitions of static hamstring stretching, each lasting 30 seconds, with 30-second rest intervals between repetitions
干预措施: Static Stretching (Other)
结局指标
主要结局
Hamstring-to-Quadriceps (H/Q) Ratio
时间窗: Immediately after intervention
Both traditional (Hcon/Qcon) and functional (Hecc/Qcon) ratios were calculated using isokinetic peak torque values.
次要结局
- Quadriceps Concentric Peak Torque(Immediately post-intervention)
- Hamstring Concentric Peak Torque(Immediately post-intervention)
- Hamstring Eccentric Peak Torque(Immediately post-intervention)
研究者
Coşkun YILMAZ
ASSOC. PROF.
Gümüşhane Universıty