التفاصيل البيبلوغرافية
| العنوان: |
FAT-FREE MASS INDEX IN NCAA DIVISION I AND II COLLEGIATE AMERICAN FOOTBALL PLAYERS. |
| المؤلفون: |
TREXLER, ERIC T., SMITH-RYAN, ABBIE E., BLUE, MALIA N. M., SCHUMACHER, RICHARD M., MAYHEW, JERRY L., MANN, J. BRYAN, IVEY, PAT A., HIRSCH, KATIE R., MOCK, MEREDITH G. |
| المصدر: |
Journal of Strength & Conditioning Research; Oct2017, Vol. 31 Issue 10, p2719-2727, 9p, 2 Charts, 4 Graphs |
| مصطلحات موضوعية: |
FOOTBALL, AGE distribution, BODY composition, COLLEGE athletes, REGRESSION analysis, ATHLETIC associations, LEAN body mass, DESCRIPTIVE statistics, PHOTON absorptiometry |
| مصطلحات جغرافية: |
UNITED States |
| مستخلص: |
Fat-free mass index (FFMI) is a height- adjusted assessment of fat-free mass (FFM), with previous research suggesting a natural upper limit of 25 kg⋅m-2 in resistance trained male athletes. The current study evaluated upper limits for FFMI in collegiate American football players (n = 235) and evaluated differences between positions, divisions, and age groups. The sample consisted of 2 National Collegiate Athletic Association Division I teams (n = 78, n = 69) and 1 Division II team (n = 88). Body composition was assessed via dual-energy x-ray absorptiometry and used to calculate FFMI; linear regression was used to normalize values to a height of 180 cm. Sixty-two participants (26.4%) had height-adjusted FFMI values above 25 kg⋅m-2 (mean = 23.7 ± 2.1 kg⋅m-2; 97.5th percentile = 28.1 kg⋅m-2;). Differences were observed among position groups (p < 0.001; η²= 0.25), with highest values observed in offensive linemen (OL) and defensive linemen (DL) and lowest values observed in offensive and defensive backs. Fat-free mass index was higher in Division I teams than Division II team (24.3 ± 1.8 kg⋅m-2; vs. 23.4 ± 1.8 kg⋅m-2;; p < 0.001; d = 0.49). Fat-free mass index did not differ between age groups. Upper limit estimations for FFMI seem to vary by position; although the 97.5th percentile (28.1 kg⋅m-2;) may represent a more suitable upper limit for the college football population as a whole, this value was exceeded by 6 linemen (3 OL and 3 DL), with a maximal observed value of 31.7 kg⋅m-2;. Football practitioners may use FFMI to evaluate an individual's capacity for additional FFM accretion, suitability for a specific position, potential for switching positions, and overall recruiting assessment. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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