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Comparison Between Isotonic 1 Repetition Maximum Measurement With Isometric Muscle Strength Testing In Healthy Females

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02717793
Recruitment Status : Completed
First Posted : March 24, 2016
Last Update Posted : March 28, 2016
Information provided by (Responsible Party):
Manisha Parai, Universiti Tunku Abdul Rahman

Brief Summary:
1 repetition maximum (RM) and Maximum Voluntary Contraction (MVC) with digital dynamometer are popular method of measuring muscle strength. The types of muscle contraction involved in both are different, 1RM involves isotonic muscle contraction (ITMC) and MVC with digital dynamometer involves isometric muscle contraction (IMMC). There are several risks involved in measurement of 1RM, such as delayed onset muscle soreness (DOMS) and unsafe for pathological joints etc, this can be reduced if IMMC is used in measuring strength. Though both cannot be equated as they are different type of contraction, therefore the purpose of this study was to compare between 1RM measurement and isometric MVC using a digital hand-held dynamometer in healthy females. Twenty nine young females (mean age = 20.77 ± 1.28) without any weight training experience (mean BMI = 20.43 ± 1.85) volunteered for the study. It was a crossover trial where 48 hours of rest period was given between each measurement technique. The result showed moderate correlations (r = 0.365-0.847) between 1RM and MVC. A simple linear regression analysis revealed a significant estimated regression equation for dominant and non-dominant hands. [Dominant, Y=0.391x + 1.472; Non-Dominant, Y=0.251x + 2.629; (Y: 1RM, x: Isometric)] with low standard error of estimation value of (Dominant, 0.74; Non-dominant, 0.80). The result also showed no significant difference between these derived equations and Brzycki 1RM prediction equation. Therefore, it was concluded that both prediction equations can be used interchangeably to predict the strength of a person, and thus IMMC can be used to predict 1RM in healthy females.

Condition or disease Intervention/treatment Phase
No Condition, Healthy Females Other: Strength testing Phase 1

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 30 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single (Outcomes Assessor)
Official Title: Comparison Between Isotonic 1 Repetition Maximum Measurement With Isometric Muscle Strength Testing In Healthy Females
Study Start Date : October 2013
Actual Primary Completion Date : December 2015

Arm Intervention/treatment
Experimental: isometric muscle strength
isometric muscle strength was measured with a digital hand-held dynamometer. The digital hand-held dynamometer was held by the therapist against the flexor aspect of the distal forearm of the subject, on the wrist joint. Subject was asked to maintain the position and a break test was done with progressive loading of 5 seconds given by the tester. The peak isometric strength was recorded by a second tester at the end of 5 seconds. A standardised instructions and verbal encouragement was given to the subject for motivation. Subject as well as the tester was blinded to the values recorded on the digital hand-held dynamometer. An average of three measurements (with a rest period of 4 minutes in between each trial session) was recorded for the analysis. After each trial session, the rate of perceived exertion (RPE) was asked to the subject using the "1-10 Borg rating of perceived exertion scale"
Other: Strength testing

isometric muscle strength

1RM measurement of muscle strength

Experimental: 1RM measurement of muscle strength
1RM measurement was done using the Brzycki 1RM prediction equation. In first testing session, subject was instructed to perform a general warm up for 5 minutes. Thereafter, the subject was asked to perform 10 repetitions of the movement using the amount of resistance that the subject felt she will be able to lift for only less than 10 times. The selection of the weight is made based on a list of weights provided (1kg to 10kg). When the subject performed the movement for 10 times or more, then the resistance was increased 1kg at a time, until the subject can perform only 9 or fewer repetitions of the movement correctly throughout the range of motion. A 3 minutes rest period was given to the subject before the new attempt was done with the increased weight. A standardized verbal encouragement was provided for motivation
Other: Strength testing

isometric muscle strength

1RM measurement of muscle strength

Primary Outcome Measures :
  1. Visual Analogue Scale [ Time Frame: 1 minute after Exercise ]

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Ages Eligible for Study:   19 Years to 35 Years   (Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy females

Exclusion Criteria:

  • musculoskeletal and neurological disorder
  • history of high blood pressure
  • heart disease
  • rheumatologic disease that affected the mobility
  • unstable cardio respiratorydisorder
  • cardiovascular disorder

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02717793

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Kajang, Selangor, Malaysia, 43000
Sponsors and Collaborators
Universiti Tunku Abdul Rahman
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Responsible Party: Manisha Parai, Lecturer, Universiti Tunku Abdul Rahman Identifier: NCT02717793    
Other Study ID Numbers: SERC231013
First Posted: March 24, 2016    Key Record Dates
Last Update Posted: March 28, 2016
Last Verified: March 2016
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No