The effects of age and musculoskeletal pain on force variability among manual workers

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Abstract

The present study investigated the influence of age and musculoskeletal pain on force variability during a continuous isometric handgrip force task performed at 30% of maximal voluntary contraction carried out until failure. We recruited 96 male manual workers aged 51–72 years. The participants were stratified according to their age (50–59 and 60+ years) and by pain status (no pain, acute pain and chronic pain). The amplitude and structure of variability expressed as respectively standard deviation (SD) and coefficient of variation (CV), and sample entropy (SaEn) were calculated from the endurance task. The oldest group had an approximately 18% longer endurance time than the youngest group. No between-group differences were found in SD or CV, whereas a significant interaction between age and pain stage was found for SaEn. The youngest group showed lower SaEn than the oldest for both those with chronic pain and those without pain, indicating less force complexity, whereas a tendency for the opposite was found in the acute pain group. Within the pain stage groups, workers with acute pain had higher SaEn compared with both the no pain and chronic pain groups. These findings suggest that age and musculoskeletal pain differentially affects the structure of force variability in manual workers.

Original languageEnglish
JournalHuman Movement Science
Volume64
Pages (from-to)19-27
Number of pages9
ISSN0167-9457
DOIs
Publication statusPublished - Apr 2019

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Musculoskeletal Pain
Entropy
Pain
Acute Pain
Chronic Pain
Advisory Committees

Keywords

  • Discomfort
  • Entropy
  • Handgrip strength
  • Motor control

Cite this

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title = "The effects of age and musculoskeletal pain on force variability among manual workers",
abstract = "The present study investigated the influence of age and musculoskeletal pain on force variability during a continuous isometric handgrip force task performed at 30{\%} of maximal voluntary contraction carried out until failure. We recruited 96 male manual workers aged 51–72 years. The participants were stratified according to their age (50–59 and 60+ years) and by pain status (no pain, acute pain and chronic pain). The amplitude and structure of variability expressed as respectively standard deviation (SD) and coefficient of variation (CV), and sample entropy (SaEn) were calculated from the endurance task. The oldest group had an approximately 18{\%} longer endurance time than the youngest group. No between-group differences were found in SD or CV, whereas a significant interaction between age and pain stage was found for SaEn. The youngest group showed lower SaEn than the oldest for both those with chronic pain and those without pain, indicating less force complexity, whereas a tendency for the opposite was found in the acute pain group. Within the pain stage groups, workers with acute pain had higher SaEn compared with both the no pain and chronic pain groups. These findings suggest that age and musculoskeletal pain differentially affects the structure of force variability in manual workers.",
keywords = "Discomfort, Entropy, Handgrip strength, Motor control",
author = "Norheim, {Kristoffer Larsen} and Afshin Samani and B{\o}nl{\o}kke, {Jakob Hjort} and {\O}yvind Omland and Madeleine, {Pascal Max}",
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AU - Norheim, Kristoffer Larsen

AU - Samani, Afshin

AU - Bønløkke, Jakob Hjort

AU - Omland, Øyvind

AU - Madeleine, Pascal Max

PY - 2019/4

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N2 - The present study investigated the influence of age and musculoskeletal pain on force variability during a continuous isometric handgrip force task performed at 30% of maximal voluntary contraction carried out until failure. We recruited 96 male manual workers aged 51–72 years. The participants were stratified according to their age (50–59 and 60+ years) and by pain status (no pain, acute pain and chronic pain). The amplitude and structure of variability expressed as respectively standard deviation (SD) and coefficient of variation (CV), and sample entropy (SaEn) were calculated from the endurance task. The oldest group had an approximately 18% longer endurance time than the youngest group. No between-group differences were found in SD or CV, whereas a significant interaction between age and pain stage was found for SaEn. The youngest group showed lower SaEn than the oldest for both those with chronic pain and those without pain, indicating less force complexity, whereas a tendency for the opposite was found in the acute pain group. Within the pain stage groups, workers with acute pain had higher SaEn compared with both the no pain and chronic pain groups. These findings suggest that age and musculoskeletal pain differentially affects the structure of force variability in manual workers.

AB - The present study investigated the influence of age and musculoskeletal pain on force variability during a continuous isometric handgrip force task performed at 30% of maximal voluntary contraction carried out until failure. We recruited 96 male manual workers aged 51–72 years. The participants were stratified according to their age (50–59 and 60+ years) and by pain status (no pain, acute pain and chronic pain). The amplitude and structure of variability expressed as respectively standard deviation (SD) and coefficient of variation (CV), and sample entropy (SaEn) were calculated from the endurance task. The oldest group had an approximately 18% longer endurance time than the youngest group. No between-group differences were found in SD or CV, whereas a significant interaction between age and pain stage was found for SaEn. The youngest group showed lower SaEn than the oldest for both those with chronic pain and those without pain, indicating less force complexity, whereas a tendency for the opposite was found in the acute pain group. Within the pain stage groups, workers with acute pain had higher SaEn compared with both the no pain and chronic pain groups. These findings suggest that age and musculoskeletal pain differentially affects the structure of force variability in manual workers.

KW - Discomfort

KW - Entropy

KW - Handgrip strength

KW - Motor control

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