An interventional study of High-Volume Non-Jumping Plyometric Training and Low-Volume Non-Jumping Plyometric Training in Sedentary Behavior / Physical Inactivity and Aging, sponsored by University of Americas - Chili. Not yet recruiting. Open to participants aged 60 Years to 80 Years. Per ClinicalTrials.gov, last updated 2026-10-23.
Sponsored by University of Americas - Chili · Not applicable, Interventional, and Prevention
The goal of this clinical trial is to investigate whether different amounts of plyometric exercise without jumping can improve lower-limb muscle strength, power, and muscle and tendon mechanical properties in sedentary and/or physically inactive older adults.
The main questions it aims to answer are:
Does performing a higher amount of plyometric exercise without jumping lead to greater improvements in functional muscle strength and power than performing a lower amount?
Do different amounts of exercise produce different changes in the mechanical properties of muscles and tendons?
Researchers will compare three groups: a high-volume exercise group, a low-volume exercise group, and a control group that will not receive the exercise intervention. This comparison will help determine how the amount of exercise influences physical function and muscle and tendon properties.
Participants will:
Be randomly assigned to one of the three groups.
Complete physical assessments before and after the eight-week study period, including tests of lower-limb strength, power, and muscle and tendon mechanical properties.
If assigned to an exercise group, participate in supervised plyometric exercise sessions without jumping twice a week for eight weeks.
If assigned to the control group, continue their usual daily activities without participating in the exercise program during the study.
The goal of this clinical trial is to investigate whether different amounts of plyometric exercise without jumping can improve lower-limb muscle strength, power, and muscle and tendon mechanical properties in sedentary and/or physically inactive older adults.
The main questions it aims to answer are:
Researchers will compare three groups: a high-volume exercise group, a low-volume exercise group, and a control group that will not receive the exercise intervention. This comparison will help determine how the amount of exercise influences physical function and muscle and tendon properties.
Participants will:
367 studies on the registry are indexed under Sedentary Behavior; 165 are open to participants now.
This study's planned enrollment of 54 is below the median of 70 across 314 interventional studies indexed under Sedentary Behavior.
Browse Sedentary Behavior studies →This is the only study on the registry with University of Americas - Chili as lead sponsor.
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Exclusion Criteria:
Participants assigned to this group will complete a supervised non-jumping plyometric training program twice weekly for eight weeks. The intervention will involve rapid eccentric-concentric lower-limb movements performed without jumping, with a progressively increasing training volume ranging from 60 to 90 repetitions per session. Exercise intensity will be comparable to that of the low-volume group, allowing the effects of training volume to be investigated.
Behavioral: High-Volume Non-Jumping Plyometric Training
Participants assigned to this group will complete a supervised non-jumping plyometric training program twice weekly for eight weeks. The intervention will involve the same exercises and comparable exercise intensity as the high-volume group, but with a lower training volume ranging from 30 to 45 repetitions per session. Training volume will progressively increase throughout the intervention period.
Behavioral: Low-Volume Non-Jumping Plyometric Training
Participants assigned to the control group will not receive the experimental exercise intervention during the eight-week study period. They will be instructed to maintain their usual daily activities and avoid initiating new structured exercise programs. Participants will undergo the same baseline and post-intervention assessments as those assigned to the experimental groups.
Participants will complete a supervised non-jumping plyometric training program twice weekly for eight weeks (16 sessions). The intervention will consist of rapid eccentric-concentric lower-limb movements performed without an aerial phase, with a progressively increasing training volume of 60-90 repetitions per session. Exercises will be performed with maximal intended movement velocity during the concentric phase, according to each participant's functional capacity. Appropriate recovery intervals and professional supervision will be provided throughout the intervention.
Participants will complete a supervised non-jumping plyometric training program twice weekly for eight weeks (16 sessions). The intervention will involve the same exercises, movement characteristics, and intended exercise intensity as the high-volume group, but with a progressively increasing training volume of 30-45 repetitions per session. Exercises will be performed with maximal intended movement velocity during the concentric phase, according to each participant's functional capacity. Appropriate recovery intervals and professional supervision will be provided throughout the intervention.
Peak Functional Lower-Limb Force
Peak lower-limb force will be assessed using an electromechanical dynamometer (DynaSystem) during an instrumented sit-to-stand-to-sit task performed under isokinetic (15 cm/s) and isotonic (60% of body weight) conditions. Peak force will be normalized to body mass and expressed in N/kg. Changes from baseline to post-intervention will be compared between groups.
Time frame: Baseline and post-intervention (Week 8).
Peak Functional Lower-Limb Power
Peak lower-limb power will be assessed using an electromechanical dynamometer (DynaSystem) during an instrumented sit-to-stand-to-sit task performed under isokinetic (15 cm/s) and isotonic (60% of body weight) conditions. Peak power will be normalized to body mass and expressed in W/kg. Changes from baseline to post-intervention will be compared between groups.
Time frame: Baseline and post-intervention (Week 8).
Muscle Oscillation Frequency
Muscle oscillation frequency will be assessed using a handheld myotonometer (MyotonPRO) in the vastus medialis, vastus lateralis, and medial gastrocnemius muscles. Oscillation frequency, expressed in hertz (Hz), will be used as an indicator of muscle tone. Changes from baseline to post-intervention will be analyzed for each muscle.
Time frame: Baseline and Week 8 (post-intervention)
Musculotendinous Stiffness
Musculotendinous stiffness will be assessed using a handheld myotonometer (MyotonPRO) in the vastus medialis, vastus lateralis, and medial gastrocnemius muscles, as well as the patellar and Achilles tendons. Stiffness will be expressed in newtons per meter (N/m). Changes from baseline to post-intervention will be analyzed separately for each anatomical structure.
Time frame: Baseline and Week 8 (post-intervention)
Muscle Logarithmic Decrement
Muscle logarithmic decrement will be assessed using a handheld myotonometer (MyotonPRO) in the vastus medialis, vastus lateralis, and medial gastrocnemius muscles. This dimensionless parameter describes the damping of natural tissue oscillations and is used as an indicator of muscle elasticity. Changes from baseline to post-intervention will be analyzed for each muscle.
Time frame: Baseline and Week 8 (post-intervention)
Muscle Relaxation Time
Muscle relaxation time will be assessed using a handheld myotonometer (MyotonPRO) in the vastus medialis, vastus lateralis, and medial gastrocnemius muscles. Relaxation time will be expressed in milliseconds (ms) and represents the time required for the tissue to recover its shape following mechanical deformation. Changes from baseline to post-intervention will be analyzed for each muscle.
Time frame: Baseline and Week 8 (post-intervention)
No study locations are listed for this record.
Plan to share: No — Individual participant data will not be shared with external researchers to protect participant confidentiality and privacy. Study findings will be disseminated through scientific publications and presentations using aggregated data that do not permit individual identification.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is not yet recruiting, as verified in Oct 2026. You cannot join it, but the record below documents what was studied.
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