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Intramuscular adipose tissue attenuates gains in muscle quality in older adults at high risk for falling. A brief report

Abstract

Objective

To examine the influence of intramuscular adipose tissue (IMAT) on muscle quality (MQ) changes in older adults after 12 weeks of exercise training.

Design

Prospective cohort design.

Setting

Academic health science center clinical exercise facility.

Participants

70 older (mean age 73.4 ± 6.3 years) adults with a history of falls.

Intervention

Resistance, endurance and balance exercise three times weekly for 12 weeks.

Measurements

Quadriceps strength was determined by maximum voluntary isometric contraction. An MRI of the thigh was used to determine cross-sectional area of lean tissue and IMAT. MQ was calculated as the force per unit area of lean tissue. Individuals were stratified into tertiles (Low IMAT, Middle IMAT, High IMAT) based on pre-IMAT levels. Changes in MQ, lean and IMAT were compared across groups.

Results

No significant changes in lean or IMAT occurred in any group with training. MQ increased only in the Low IMAT group. The Middle and High IMAT groups did not demonstrate a significant change in MQ following 12 weeks of training. Low IMAT, pre = 2.7 [0.6] post= 3.0 [0.6]; Middle IMAT, pre =2.54 [0.8] post =2.75 [0.7]; High IMAT, pre =2.6 [0.6] to post =2.5 [0.6].

Conclusion

High levels of thigh IMAT appear to blunt the adaptive MQ response to training. High levels of thigh IMAT may be a potential reason why some older adults do not change their MQ following training. Future research should confirm these results and determine why IMAT impairs MQ and the adaptive response to training in older adults.

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Correspondence to Robin L. Marcus or Paul C. LaStayo.

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Marcus, R.L., Addison, O. & LaStayo, P.C. Intramuscular adipose tissue attenuates gains in muscle quality in older adults at high risk for falling. A brief report. J Nutr Health Aging 17, 215–218 (2013). https://doi.org/10.1007/s12603-012-0377-5

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  • DOI: https://doi.org/10.1007/s12603-012-0377-5

Key words

  • Intramuscular adipose tissue
  • exercise
  • muscle quality