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

NCT02717793 | Completed Phase 1 DMC

• 1 other identifier: SERC231013
• Study Type: interventional
• Target: 30
• Locations: 1 country
• Sites: 1

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.

Conditions

No Condition, Healthy Females

Outcome Measures

Primary Outcomes (1)

• Visual Analogue Scale

  1 minute after Exercise

Study Arms (2)

isometric muscle strength

EXPERIMENTAL

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

1RM measurement of muscle strength

EXPERIMENTAL

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

Interventions

Strength testing OTHER

isometric muscle strength 1RM measurement of muscle strength

1RM measurement of muscle strength; isometric muscle strength

Eligibility Criteria

• Age: 19 Years - 35 Years
• Sex: female
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• Healthy females

You may not qualify if:

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

Sponsors & Collaborators

• Universiti Tunku Abdul Rahman: lead

Study Sites (1)

Manisha

Kajang, Selangor, 43000, Malaysia

Location

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: OUTCOMES ASSESSOR
• Intervention Model: CROSSOVER
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Lecturer

Study Record Dates

• First Submitted: February 6, 2016
• First Posted: March 24, 2016
• Study Start: October 1, 2013
• Primary Completion: December 1, 2015
• Last Updated: March 28, 2016

Record last verified: 2016-03

Data Sharing

• IPD Sharing: Will not share

Locations

MY (1)