Relationship between lean body mass and isokinetic peak torque of knee extensors and flexors in severely burned children

Christian Tapking, Andrew M. Armenta, Daniel Popp, David Herndon, Ludwik Branski, Jong Lee, Oscar Suman

Research output: Contribution to journalArticle

Abstract

Objective: Severe burns cause hypermetabolic responses and prolonged hospitalization, resulting in loss of body mass and muscle strength. This study aimed to determine whether long-term gains in lean body mass (LBM) after structured exercise programs are functionally meaningful and related to greater muscle strength in severely burned children. Study design: LBM and muscle strength were measured at discharge and at 6, 12, 24, and 36 months after burn in 349 children. Body composition, including LBM, was measured via dual-emission X-ray-absorptiometry. Peak torque was measured using Biodex dynamometer at varying angular velocities (90, 120, 150, 180°/s). Pearson correlation analysis evaluated the association between LBM and peak torque. Results: LBM progressively increased from discharge (32.5 ± 11.5 kg) to 36 months following injury (40.2 ± 12.3 kg). Peak torque and peak torque/LBM increased from discharge (56.4 ± 34.0 Nm and 1.7 ± 34.0 Nm kg−1) to 36 months after burn (102.3 ± 43.8 Nm and 2.5 ± 0.7 Nm kg−1, p < 0.01 for both). LBM and peak torque at all angular velocities showed moderate/strong correlations, with 120°/s being the strongest (all time-points: R2 ≥ 0.57). Conclusion: In severely burned children participating in a rehabilitative exercise program, gains in LBM over time are related to increases in muscle strength, suggesting that gained muscle mass is functional. Measurement of muscle strength at an angular velocity of 120°/s best reflects gains in LBM and should be considered for reliable measure of strength in future studies.

Original languageEnglish (US)
JournalBurns
DOIs
StateAccepted/In press - Jan 1 2018

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Torque
Muscle Strength
Knee
Exercise
Photon Absorptiometry
Body Composition
Burns
Hospitalization
Muscles
Wounds and Injuries

Keywords

  • Body composition
  • Pediatric
  • Rehabilitation
  • Thermal injury

ASJC Scopus subject areas

  • Surgery
  • Emergency Medicine
  • Critical Care and Intensive Care Medicine

Cite this

Relationship between lean body mass and isokinetic peak torque of knee extensors and flexors in severely burned children. / Tapking, Christian; Armenta, Andrew M.; Popp, Daniel; Herndon, David; Branski, Ludwik; Lee, Jong; Suman, Oscar.

In: Burns, 01.01.2018.

Research output: Contribution to journalArticle

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title = "Relationship between lean body mass and isokinetic peak torque of knee extensors and flexors in severely burned children",
abstract = "Objective: Severe burns cause hypermetabolic responses and prolonged hospitalization, resulting in loss of body mass and muscle strength. This study aimed to determine whether long-term gains in lean body mass (LBM) after structured exercise programs are functionally meaningful and related to greater muscle strength in severely burned children. Study design: LBM and muscle strength were measured at discharge and at 6, 12, 24, and 36 months after burn in 349 children. Body composition, including LBM, was measured via dual-emission X-ray-absorptiometry. Peak torque was measured using Biodex dynamometer at varying angular velocities (90, 120, 150, 180°/s). Pearson correlation analysis evaluated the association between LBM and peak torque. Results: LBM progressively increased from discharge (32.5 ± 11.5 kg) to 36 months following injury (40.2 ± 12.3 kg). Peak torque and peak torque/LBM increased from discharge (56.4 ± 34.0 Nm and 1.7 ± 34.0 Nm kg−1) to 36 months after burn (102.3 ± 43.8 Nm and 2.5 ± 0.7 Nm kg−1, p < 0.01 for both). LBM and peak torque at all angular velocities showed moderate/strong correlations, with 120°/s being the strongest (all time-points: R2 ≥ 0.57). Conclusion: In severely burned children participating in a rehabilitative exercise program, gains in LBM over time are related to increases in muscle strength, suggesting that gained muscle mass is functional. Measurement of muscle strength at an angular velocity of 120°/s best reflects gains in LBM and should be considered for reliable measure of strength in future studies.",
keywords = "Body composition, Pediatric, Rehabilitation, Thermal injury",
author = "Christian Tapking and Armenta, {Andrew M.} and Daniel Popp and David Herndon and Ludwik Branski and Jong Lee and Oscar Suman",
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T1 - Relationship between lean body mass and isokinetic peak torque of knee extensors and flexors in severely burned children

AU - Tapking, Christian

AU - Armenta, Andrew M.

AU - Popp, Daniel

AU - Herndon, David

AU - Branski, Ludwik

AU - Lee, Jong

AU - Suman, Oscar

PY - 2018/1/1

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N2 - Objective: Severe burns cause hypermetabolic responses and prolonged hospitalization, resulting in loss of body mass and muscle strength. This study aimed to determine whether long-term gains in lean body mass (LBM) after structured exercise programs are functionally meaningful and related to greater muscle strength in severely burned children. Study design: LBM and muscle strength were measured at discharge and at 6, 12, 24, and 36 months after burn in 349 children. Body composition, including LBM, was measured via dual-emission X-ray-absorptiometry. Peak torque was measured using Biodex dynamometer at varying angular velocities (90, 120, 150, 180°/s). Pearson correlation analysis evaluated the association between LBM and peak torque. Results: LBM progressively increased from discharge (32.5 ± 11.5 kg) to 36 months following injury (40.2 ± 12.3 kg). Peak torque and peak torque/LBM increased from discharge (56.4 ± 34.0 Nm and 1.7 ± 34.0 Nm kg−1) to 36 months after burn (102.3 ± 43.8 Nm and 2.5 ± 0.7 Nm kg−1, p < 0.01 for both). LBM and peak torque at all angular velocities showed moderate/strong correlations, with 120°/s being the strongest (all time-points: R2 ≥ 0.57). Conclusion: In severely burned children participating in a rehabilitative exercise program, gains in LBM over time are related to increases in muscle strength, suggesting that gained muscle mass is functional. Measurement of muscle strength at an angular velocity of 120°/s best reflects gains in LBM and should be considered for reliable measure of strength in future studies.

AB - Objective: Severe burns cause hypermetabolic responses and prolonged hospitalization, resulting in loss of body mass and muscle strength. This study aimed to determine whether long-term gains in lean body mass (LBM) after structured exercise programs are functionally meaningful and related to greater muscle strength in severely burned children. Study design: LBM and muscle strength were measured at discharge and at 6, 12, 24, and 36 months after burn in 349 children. Body composition, including LBM, was measured via dual-emission X-ray-absorptiometry. Peak torque was measured using Biodex dynamometer at varying angular velocities (90, 120, 150, 180°/s). Pearson correlation analysis evaluated the association between LBM and peak torque. Results: LBM progressively increased from discharge (32.5 ± 11.5 kg) to 36 months following injury (40.2 ± 12.3 kg). Peak torque and peak torque/LBM increased from discharge (56.4 ± 34.0 Nm and 1.7 ± 34.0 Nm kg−1) to 36 months after burn (102.3 ± 43.8 Nm and 2.5 ± 0.7 Nm kg−1, p < 0.01 for both). LBM and peak torque at all angular velocities showed moderate/strong correlations, with 120°/s being the strongest (all time-points: R2 ≥ 0.57). Conclusion: In severely burned children participating in a rehabilitative exercise program, gains in LBM over time are related to increases in muscle strength, suggesting that gained muscle mass is functional. Measurement of muscle strength at an angular velocity of 120°/s best reflects gains in LBM and should be considered for reliable measure of strength in future studies.

KW - Body composition

KW - Pediatric

KW - Rehabilitation

KW - Thermal injury

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