First and Last Name/s of Presenters

Emily TobinFollow

Mentor/s

Dr. Matthew Moran

Participation Type

Poster

Abstract

Introduction: Anterior cruciate ligament (ACL) tears are a common injury that many athletes have repaired, ACL-Reconstruction (ACL-R). Athletes will then participate in a return-to-sports (RTS) protocol, which usually includes single-leg hop assessments. Both single-leg hop (SLH) and single-leg triple hop (SLTH) have been shown to be reliable.1–3 IMeasureU device is a three-dimensional motion capture system and can record accelerations of different body segments (i.e. tibial acceleration). There is no evidence that has shown the reliability of an IMU device on single-leg hop assessments.

Purpose: The purpose of this study was to determine the reliability of an IMeasureU device on the single-leg hop for distance and single-leg triple hop for distance.

Methods: Twenty subjects (20.05 ± .887 years, 1.68 ± .078m, 66.73 ± 0.078kg) were hypothetically created for this study due to COVID-19. All participants had to meet the inclusion criteria to be allowed to participate in this IRB approved study. All participants’ ankle circumference, height, and weight were measured. IMU device was attached with the correct sized strap. A standardized warm-up was given to each participant and then both single-leg hop assessments were performed. The order of the hop assessments was counter-balanced. Two practice trials were given, then at least three trials were given for each assessment. There was a two-minute rest between the first hop assessment and the second. All data were filtered with a 4th order dual-pass Butterworth low-pass filter. The resultant peak tibial acceleration (PTA) for the best trail of each hop condition (SLH and SLTH) was calculated. For both hop assessments, the average of the three-hop PTAs will be used to calculate: Mean (M), Standard Deviation (SD), mean difference, and Intra-class correlation coefficients (ICCs) assessed between-session reliability, from which 95% confidence intervals (CIs) will be obtained.

Results: Due to COVID-19 results are hypothesized. Session 1 and Session 2 distance traveled for SLH was 105.92 ± 24.10cm and 105.90 ± 23.85cm, respectively. SLTH distance traveled for session 1 was 370.72 ± 83.35cm and session 2 was 370.65 ± 84.49cm. SLH PTA was 27.30 ± 7.29g for session 1 and 26.25 ± 9.55g for session 2. SLTH 29.65 ± 7.29g and 28.15 ± 9.04g for sessions 1 and 2, respectfully. Test-retest ICC values for both SLH and SLTH distance traveled was 0.90. Test-retest ICC values for PTA for SLTH were 0.76 and SLH was 0.74. The average time to peak tibial acceleration (TPTA) for SLH was 9.47ms ± 2.38ms and SLTH 10.25ms ± 2.49ms. Jerk for SLH was 2628.43g ± 1225.39g and SLTH was 3042.50g ± 1281.99g. There was no statistical significance in any of these values.

Discussion: IMU device proved to have moderate-good test-retest reliability in this study. Having other metrics, PTA and TPTA may disqualify some athletes that may try RTS too soon after an ACL-R. If hop distance was just used, these athletes may have been allowed to RTS before they were ready for competition.

College and Major available

Exercise Science UG

Course Name and Number, Professor Name

EX-398-IA, Matthew Moran

Location

Digital Commons

Start Day/Time

4-24-2020 2:00 PM

End Day/Time

4-24-2020 4:00 PM

Students' Information

Emily Tobin, Exercise Science, 2020

Comments

This is a narrated presentation (11 min.)

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Apr 24th, 2:00 PM Apr 24th, 4:00 PM

Test-Retest Reliability of a Wearable Tibial Monitor During Single-Leg Hopping Assessments

Digital Commons

Introduction: Anterior cruciate ligament (ACL) tears are a common injury that many athletes have repaired, ACL-Reconstruction (ACL-R). Athletes will then participate in a return-to-sports (RTS) protocol, which usually includes single-leg hop assessments. Both single-leg hop (SLH) and single-leg triple hop (SLTH) have been shown to be reliable.1–3 IMeasureU device is a three-dimensional motion capture system and can record accelerations of different body segments (i.e. tibial acceleration). There is no evidence that has shown the reliability of an IMU device on single-leg hop assessments.

Purpose: The purpose of this study was to determine the reliability of an IMeasureU device on the single-leg hop for distance and single-leg triple hop for distance.

Methods: Twenty subjects (20.05 ± .887 years, 1.68 ± .078m, 66.73 ± 0.078kg) were hypothetically created for this study due to COVID-19. All participants had to meet the inclusion criteria to be allowed to participate in this IRB approved study. All participants’ ankle circumference, height, and weight were measured. IMU device was attached with the correct sized strap. A standardized warm-up was given to each participant and then both single-leg hop assessments were performed. The order of the hop assessments was counter-balanced. Two practice trials were given, then at least three trials were given for each assessment. There was a two-minute rest between the first hop assessment and the second. All data were filtered with a 4th order dual-pass Butterworth low-pass filter. The resultant peak tibial acceleration (PTA) for the best trail of each hop condition (SLH and SLTH) was calculated. For both hop assessments, the average of the three-hop PTAs will be used to calculate: Mean (M), Standard Deviation (SD), mean difference, and Intra-class correlation coefficients (ICCs) assessed between-session reliability, from which 95% confidence intervals (CIs) will be obtained.

Results: Due to COVID-19 results are hypothesized. Session 1 and Session 2 distance traveled for SLH was 105.92 ± 24.10cm and 105.90 ± 23.85cm, respectively. SLTH distance traveled for session 1 was 370.72 ± 83.35cm and session 2 was 370.65 ± 84.49cm. SLH PTA was 27.30 ± 7.29g for session 1 and 26.25 ± 9.55g for session 2. SLTH 29.65 ± 7.29g and 28.15 ± 9.04g for sessions 1 and 2, respectfully. Test-retest ICC values for both SLH and SLTH distance traveled was 0.90. Test-retest ICC values for PTA for SLTH were 0.76 and SLH was 0.74. The average time to peak tibial acceleration (TPTA) for SLH was 9.47ms ± 2.38ms and SLTH 10.25ms ± 2.49ms. Jerk for SLH was 2628.43g ± 1225.39g and SLTH was 3042.50g ± 1281.99g. There was no statistical significance in any of these values.

Discussion: IMU device proved to have moderate-good test-retest reliability in this study. Having other metrics, PTA and TPTA may disqualify some athletes that may try RTS too soon after an ACL-R. If hop distance was just used, these athletes may have been allowed to RTS before they were ready for competition.