Strengthening Effect on Hamstring's Passive Mechanical Properties

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

42 participants

Study Classification

INTERVENTIONAL

Study Start Date

2019-03-21

Study Completion Date

2019-12-01

Brief Summary

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The purpose of this study was to investigate effects of different strengthening methods on hamstring muscle group's passive mechanical properties and to investigate this effect's relation with performance changes in healthy individuals. 42 healthy sedentary male participated in this study. Passive mechanical properties and strength of hamstring and quadriceps muscles, flexibility of hamstring muscles, anaerobic explosive strength, reaction time, agility were measured. Participants randomized evenly into one of three groups; eccentric, concentric and neuromuscular electrical stimulation (NMES). After 8 weeks training period, participants were measured again.

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Detailed Description

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Conditions

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Sports Physical Therapy

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

randomization into three groups and measurement before and after intervention

Primary Study Purpose

BASIC_SCIENCE

Blinding Strategy

NONE

Study Groups

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Concentric

Leg Curl Training

Group Type ACTIVE_COMPARATOR

Concentric Exercise

Intervention Type OTHER

Leg Curl Machine: 1st week - 1st day is 10 maximum repeat test. 2nd week - 2 days of training - 2 sets of 6 repeats. %60 percent of maximum load.

3rd week - 3 days of training - 3 sets of 6-8 repeats. %60-80 of maximum load. 4th-8th week - 3 days of training - 3 sets of 8-12 repeats. when 3 sets of 12 achieved, load was increased with 2.5kg.

Eccentric

Nordic Hamstring Training

Group Type ACTIVE_COMPARATOR

Nordic Eccentric exercise

Intervention Type OTHER

1. st week - 1 day - 2 sets of 5 repeats.
2. nd week - 2 days - 2 sets of 6 repeats.
3. rd week - 3 days - 3 sets of 6-8 repeats.
4. th week - 3 days - 3 sets of 8-10 repeats. 5-8th weeks - 3 days - 3 sets of 12-8 repeats. When achieved 3 sets of 12 repeats with full range, speed was increased.

Neuromuscular Electrical Stimulation

Stimulation Training

Group Type ACTIVE_COMPARATOR

Neuromuscular Electrical Stimulation

Intervention Type OTHER

8 weeks, three times per week, 15 minutes of bilateral hamstring stimulation. 100 Hz. frequency, 600 microsecond duration rectangular current

Interventions

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Concentric Exercise

Leg Curl Machine: 1st week - 1st day is 10 maximum repeat test. 2nd week - 2 days of training - 2 sets of 6 repeats. %60 percent of maximum load.

3rd week - 3 days of training - 3 sets of 6-8 repeats. %60-80 of maximum load. 4th-8th week - 3 days of training - 3 sets of 8-12 repeats. when 3 sets of 12 achieved, load was increased with 2.5kg.

Intervention Type OTHER

Nordic Eccentric exercise

1. st week - 1 day - 2 sets of 5 repeats.
2. nd week - 2 days - 2 sets of 6 repeats.
3. rd week - 3 days - 3 sets of 6-8 repeats.
4. th week - 3 days - 3 sets of 8-10 repeats. 5-8th weeks - 3 days - 3 sets of 12-8 repeats. When achieved 3 sets of 12 repeats with full range, speed was increased.

Intervention Type OTHER

Neuromuscular Electrical Stimulation

8 weeks, three times per week, 15 minutes of bilateral hamstring stimulation. 100 Hz. frequency, 600 microsecond duration rectangular current

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* being sedentary

Exclusion Criteria

* Having knee, hip and/or back pain
* Having a cardiovascular condition/disease
* History of previous knee and/or hip surgery
* Having a diagnose of any systemic disease
* History of previous hamstring injury
* Being physically active within last year ( Regular activity at least 3 days a week and continuity of at least 2 months was accepted as being physically active)

Minimum Eligible Age

18 Years

Maximum Eligible Age

30 Years

Eligible Sex

MALE

Accepts Healthy Volunteers

Yes