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Titolo:
Evaluation of the strength-size relationship in vivo using various muscle size indices
Autore:
Bamman, MM; Newcomer, BR; Larson-Meyer, DE; Weinsier, RL; Hunter, GR;
Indirizzi:
Univ Alabama, Dept Human Studies, Exercise Physiol Lab, Ctr Nucl Imaging Res, Birmingham, AL 35294 USA Univ Alabama Birmingham AL USA 35294 maging Res, Birmingham, AL 35294 USA Univ Alabama, Div Physiol & Metab, Dept Nutr Sci, Birmingham, AL 35294 USAUniv Alabama Birmingham AL USA 35294 t Nutr Sci, Birmingham, AL 35294 USA
Titolo Testata:
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
fascicolo: 7, volume: 32, anno: 2000,
pagine: 1307 - 1313
SICI:
0195-9131(200007)32:7<1307:EOTSRI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
CROSS-SECTIONAL AREA; RESISTANCE EXERCISE; BED REST; FORCE; ARCHITECTURE; TENSION; TORQUE; YOUNG;
Keywords:
anatomical cross-sectional area; physiological cross-sectional area; triceps surae; specific tension; maximal voluntary contraction; isometric;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Bamman, MM Univ Alabama, Dept Human Studies, Exercise Physiol Lab, Ctr Nucl Imaging Res, EB207,901 13th St S, Birmingham, AL 35294 USA Univ Alabama EB207,901 13th St S Birmingham AL USA 35294 94 USA
Citazione:
M.M. Bamman et al., "Evaluation of the strength-size relationship in vivo using various muscle size indices", MED SCI SPT, 32(7), 2000, pp. 1307-1313

Abstract

Purpose: It is well accepted that maximum strength is related to muscle size. The primary purpose of this study was to determine whether anthropometric or dual-energy x-ray absorptiometry (DEXA) estimates of muscle size werevalid predictors of plantar flexor maximum voluntary contraction (MVC) strength and could be used in lieu of more sophisticated techniques (e.g., magnetic resonance imaging (MRI)). Additionally, we compared the relationship among MVC and three MRI-determined muscle size measures; anatomical (ACSA) and physiological (PCSA) cross-sectional areas; and muscle volume (VOLm). Methods: We measured plantar flexor MVC at 1.83 rad and various indices of muscle size: 1) body weight, 2) total body lean mass (LM) (DEXA), 3) lower leg LM (DEXA). 4) lower leg circumference, 5) estimated muscle+bone cross-sectional area (CSA) from circumference and calf skin-fold, 6) triceps surae ACSA, 7) triceps surae PCSA, and (8) triceps surae volume (VOLm), in 39 premenopausal women (mean +/- SD: 36 +/- 8 yr, 165 +/- 6 cm, and 65 +/- 9 kg). Results: Zero-order correlations showed significant (P < 0.05) associations between MVC and total body LM (r = 0.365), lower leg LM (r = 0.381), circumference (r = 0.584), estimated muscle+bone CSA (r = 0.447), ACSA (r = 0.733), PCSA (r = 0.715), and VOL, (r = 0.649). By using the Fisher Z-transformation, ACSA and PCSA correlated significantly higher with MVC (P < 0.05) than anthropometric and DEXA indices. Further, only ACSA and PCSA regressed to the origin, indicating the ability to predict MVC was greatest with these two measures. Conclusions: The MRI-determined muscle size indices, which were specific to the triceps surae, correlated with strength better than whole limb anthropometric and DEXA indices. In this group of women, both ACSAand PCSA appeared superior to VOLm for predicting strength. PCSA was not found to be more precise than ACSA. ACSA appears to provide adequate precision for estimating plantar flexor specific tension in vivo.

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Documento generato il 09/07/20 alle ore 00:55:41