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Relationship between fat-to-fat-free mass ratio and decrements in leg strength after downhill running.

Publication ,  Journal Article
Hickner, RC; Mehta, PM; Dyck, D; Devita, P; Houmard, JA; Koves, T; Byrd, P
Published in: J Appl Physiol (1985)
April 2001

The purpose of this study was to determine whether greater body fat mass (FM) relative to lean mass would result in more severe muscle damage and greater decrements in leg strength after downhill running. The relationship between the FM-to-fat-free mass ratio (FM/FFM) and the strength decline resulting from downhill running (-11% grade) was investigated in 24 male runners [age 23.4 +/- 0.7 (SE) yr]. The runners were divided into two groups on the basis of FM/FFM: low fat (FM/FFM = 0.100 +/- 0.008, body mass = 68.4 +/- 1.3 kg) and normal fat (FM/FFM = 0.233 +/- 0.020, body mass = 76.5 +/- 3.3 kg, P < 0.05). Leg strength was reduced less in the low-fat (-0.7 +/- 1.3%) than in the normal-fat individuals (-10.3 +/- 1.5%) 48 h after, compared with before, downhill running (P < 0.01). Multiple linear regression analysis revealed that the decline in strength could be predicted best by FM/FFM (r2 = 0.44, P < 0.05) and FM-to-thigh lean tissue cross-sectional area ratio (r2 = 0.53, P < 0.05), with no additional variables enhancing the prediction equation. There were no differences in muscle glycogen, creatine phosphate, ATP, or total creatine 48 h after, compared with before, downhill running; however, the change in muscle glycogen after downhill running was associated with a higher FM/FFM (r = -0.56, P < 0.05). These data suggest that FM/FFM is a major determinant of losses in muscle strength after downhill running.

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Published In

J Appl Physiol (1985)

DOI

ISSN

8750-7587

Publication Date

April 2001

Volume

90

Issue

4

Start / End Page

1334 / 1341

Location

United States

Related Subject Headings

  • Running
  • Regression Analysis
  • Physiology
  • Physical Fitness
  • Phosphocreatine
  • Oxygen Consumption
  • Muscular Diseases
  • Muscle, Skeletal
  • Male
  • Leg
 

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Hickner, R. C., Mehta, P. M., Dyck, D., Devita, P., Houmard, J. A., Koves, T., & Byrd, P. (2001). Relationship between fat-to-fat-free mass ratio and decrements in leg strength after downhill running. J Appl Physiol (1985), 90(4), 1334–1341. https://doi.org/10.1152/jappl.2001.90.4.1334
Hickner, R. C., P. M. Mehta, D. Dyck, P. Devita, J. A. Houmard, T. Koves, and P. Byrd. “Relationship between fat-to-fat-free mass ratio and decrements in leg strength after downhill running.J Appl Physiol (1985) 90, no. 4 (April 2001): 1334–41. https://doi.org/10.1152/jappl.2001.90.4.1334.
Hickner RC, Mehta PM, Dyck D, Devita P, Houmard JA, Koves T, et al. Relationship between fat-to-fat-free mass ratio and decrements in leg strength after downhill running. J Appl Physiol (1985). 2001 Apr;90(4):1334–41.
Hickner, R. C., et al. “Relationship between fat-to-fat-free mass ratio and decrements in leg strength after downhill running.J Appl Physiol (1985), vol. 90, no. 4, Apr. 2001, pp. 1334–41. Pubmed, doi:10.1152/jappl.2001.90.4.1334.
Hickner RC, Mehta PM, Dyck D, Devita P, Houmard JA, Koves T, Byrd P. Relationship between fat-to-fat-free mass ratio and decrements in leg strength after downhill running. J Appl Physiol (1985). 2001 Apr;90(4):1334–1341.

Published In

J Appl Physiol (1985)

DOI

ISSN

8750-7587

Publication Date

April 2001

Volume

90

Issue

4

Start / End Page

1334 / 1341

Location

United States

Related Subject Headings

  • Running
  • Regression Analysis
  • Physiology
  • Physical Fitness
  • Phosphocreatine
  • Oxygen Consumption
  • Muscular Diseases
  • Muscle, Skeletal
  • Male
  • Leg