Plyometric Exercise to Improve Rapid Force Production in Older Men: a Pilot Intervention
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- KU Leuven
- 入组人数
- 42
- 试验地点
- 2
- 主要终点
- Jumping height in squat jump
研究概览
简要总结
Rapid force production declines as a consequence of ageing. Given the functional relevance of rapid force production, exercise interventions in older adults should aim at improving the capacity to produce force rapidly. To improve this capacity, exercises should be performed with the intention to develop high speeds, as supported by previous work.
Human locomotion fundamentally consists of multi-joint movements and rapidly coupled eccentric-concentric muscle actions, known as stretch-shortening cycle (SSC) activities or plyometrics. Plyometrics might therefore be used to optimize power production. However, there is limited research on the feasibility of plyometrics in older adults and its potential effects on rapid force production and functional capacity. This study will test the feasibility of a 12-week plyometric exercise intervention in older men and compare its effects on rapid force production to a traditional resistance exercise or walking intervention.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 65 Years 至 80 Years（Older Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- 未提供
排除标准
- •No systematic engagement in (resistance) exercise in the 12-months prior to participation
- •Cardiovascular disease
- •Neurological disorders
- •Cognitive malfunctioning
- •Severe knee or hip problems
研究组 & 干预措施
Resistance exercise
12-week resistance exercise program for the leg muscles (2-4 sets of 8-15 repetitions at 8-15RM, leg press, leg extension, calve extension).
干预措施: Exercise intervention (Other)
Walking
12-week progressive walking program.
干预措施: Exercise intervention (Other)
Plyometric exercise
12-week progressive exercise program, consisting of plyometric exercises such as countermovement jump, forward and sideways step-up.
干预措施: Exercise intervention (Other)
结局指标
主要结局
Jumping height in squat jump
时间窗: Change from baseline in jumping height at 12 weeks
Subjects perform a test protocol on a sledge apparatus, consisting of squat jumps (SJ), countermovement jumps (CMJ), and drop jumps (DJ). The inclination of the sledge is 20° to horizontal. The seat of the sledge is inclined backwards (130°). A force platform is built in perpendicular to the jumping direction. A speed sensor is attached to the seat of the sledge, which is used to assess the transition point between braking and push-off phases and to calculate jumping height (in cm).
Rapid force production
时间窗: Change from baseline in rapid force production at 12 weeks
Subjects perform a test protocol on a sledge apparatus, consisting of explosive isometric voluntary contractions for the leg-extensor muscles of the right leg. The inclination of the sledge is 20° to horizontal. The seat of the sledge is inclined backwards (130°). The knee joint angle is set at 90° and the hip angle at 70°. The point of force application is aligned with the head of the fifth metatarsal. Subjects are instructed to kick as fast and as hard as possible and maintain their maximum force for approximately 3s. The rate of force development (N/s) is defined as the linear slope of the force-time curve and is measured from the onset of movement till 100 ms.
Jumping height in countermovement jump
时间窗: Change from baseline in jumping height at 12 weeks
Subjects perform a test protocol on a sledge apparatus, consisting of squat jumps (SJ), countermovement jumps (CMJ), and drop jumps (DJ). The inclination of the sledge is 20° to horizontal. The seat of the sledge is inclined backwards (130°). A force platform is built in perpendicular to the jumping direction. A speed sensor is attached to the seat of the sledge, which is used to assess the transition point between braking and push-off phases and to calculate jumping height (in cm).
Jumping height in drop jump
时间窗: Change from baseline in jumping height at 12 weeks
Subjects perform a test protocol on a sledge apparatus, consisting of squat jumps (SJ), countermovement jumps (CMJ), and drop jumps (DJ). The inclination of the sledge is 20° to horizontal. The seat of the sledge is inclined backwards (130°). A force platform is built in perpendicular to the jumping direction. A speed sensor is attached to the seat of the sledge, which is used to assess the transition point between braking and push-off phases and to calculate jumping height (in cm).
次要结局
- Leg press one-repetition maximum(Change from baseline in leg press 1-RM at 12 weeks)
- Maximal isokinetic strength(Change from baseline in maximal isokinetic strength at 12 weeks)
- Maximal isometric strength(Change from baseline in maximal isometric strength at 12 weeks)
- 5 repetition sit-to-stand test(Change from baseline in sit-to-stand duration at 12 weeks)
- Balance(Change from baseline in balance at 12 weeks)
- Stair Climbing performance(Change from baseline in Stair Climbing performance at 12 weeks)
- Gait speed(Change from baseline in gait speed at 12 weeks)
- 6 minute walk distance(Change from baseline in 6min walk distance at 12 weeks)