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Relationship Between BMI and Fatigability Is Task Dependent.

Ranjana K Mehta1, Lora Anne Cavuoto2

  • 1Texas A&M University, College Station.

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Summary
This summary is machine-generated.

Obesity impacts muscle fatigability, particularly in larger muscles at lower work intensities. Endurance differences between body mass index (BMI) groups are task-specific, not universal.

Keywords:
enduranceexhaustionobesityoverexertionstrength loss

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Area of Science:

  • Exercise physiology
  • Human biomechanics
  • Occupational health

Background:

  • Body Mass Index (BMI) is a common metric for classifying weight status.
  • Understanding how different BMI categories affect physical performance is crucial for various applications.
  • Fatigability, the decline in muscle force or power, is a key aspect of physical performance.

Purpose of the Study:

  • To investigate the influence of Body Mass Index (BMI) on muscle fatigability.
  • To examine this effect across three distinct muscle groups (handgrip, shoulder, trunk).
  • To assess fatigability at varying work intensities (20%, 40%, 60%, 80% of maximum voluntary contraction).

Main Methods:

  • Recruited participants across normal-weight, overweight, and obese BMI categories.
  • Assessed isometric fatiguing exertions for handgrip, shoulder flexion, and trunk extension.
  • Measured endurance time and perceived effort at four controlled work intensities.

Main Results:

  • Obese adults showed 22-30% less endurance than normal-weight adults, specifically at lower intensities and with larger, postural muscles.
  • Muscle strength and strength loss due to fatigue were comparable across BMI groups.
  • Obesity correlated with a quicker increase in perceived effort during low-intensity shoulder and trunk tasks.
  • Females exhibited greater shoulder fatigue resistance than males at lower intensities.

Conclusions:

  • The relationship between obesity and muscle fatigability is dependent on the specific task and muscle group.
  • These findings highlight that obesity's impact on physical capacity is nuanced and task-specific.