Muscle Strength, Power, and Torque Deficits in Children With Type SS Sickle Cell Disease

作者：Dougherty Kelly A^*; Bertolaso Chiara; Schall Joan I; Smith Whitley Kim; Stallings Virginia A

来源：Journal of Pediatric Hematology/Oncology, 2018, 40(5): 348-354.

DOI：10.1097/MPH.0000000000001143

• pediatrics
• muscle function
• Biodex
• sickle cell disease
• muscle torque

In African-American children aged 5 to 17 years with and without type SS sickle cell disease (SCD-SS), dominant hand maximal handgrip strength, peak power, and plantar flexion isometric maximal voluntary contraction (MVC) torque were compared with adjustments for body size and composition. Children with SCD-SS (n=21; age, 11 +/- 1y) compared with healthy control children (n=23; 10 +/- 1y) did not differ by age, sex, or maturation stage, but had significantly lower Z scores for height, weight, body mass index, arm circumference, upper arm muscle area, and lean mass-for-height. Children with SCD-SS had significantly lower unadjusted handgrip strength (16 +/- 2 vs. 23 +/- 2kg, P<0.01), peak power (1054 +/- 107 vs. 1488 +/- 169W, P<0.04) and MVC torques at 2 angles (10 degrees: 27 +/- 3 vs. 42 +/- 5Nm; 20 degrees: 21 +/- 3 vs. 34 +/- 4Nm; all P<0.05). Performance decrements persisted when handgrip strength was adjusted for lean body mass and fat mass explaining 66% of the variance; peak power adjusted for age, lean body mass, fat mass, and height explaining 91% of the variance; and the highest MVC torque (10-degree angle) adjusted for left leg length, lean mass-for-height, and fat mass-for-height Z scores explaining 65% of the variance. This suggests additional factors contribute to the attenuated anaerobic performance.

• 出版日期2018-7