Muscular force is reduced in neurofibromatosis type 1

Area of Science:

• Neurology
• Musculoskeletal Health

Background:

• Neurofibromatosis type 1 (NF1) is a genetic disorder with varied clinical manifestations.
• Muscle strength deficits are not widely studied in NF1 populations.

Purpose of the Study:

• To quantify maximal voluntary muscular force in patients with NF1.
• To compare muscle strength between NF1 patients and a healthy control group.

Main Methods:

• Maximal voluntary muscular force (Fmax) measured using a handgrip test in 21 NF1 patients and 21 matched healthy controls.
• Forearm circumference measured to calculate force per unit forearm area for standardized comparison.
• Data analyzed using the t-Student test with statistical significance set at P<0.05.

Main Results:

• NF1 patients demonstrated lower mean maximal voluntary muscular force (Fmax) than expected for their age and sex.
• Force per unit forearm area (F(area)) was significantly lower in both male and female NF1 patients compared to healthy controls.
• NF1 males: 5.7-/+2.6 N x cm(-2) vs. healthy males: 9.8-/+3.2 N x cm(-2). NF1 females: 5.7-/+1.9 N x cm(-2) vs. healthy females: 6.7-/+1.6 N x cm(-2).

Conclusions:

• Maximal voluntary muscle force is reduced in individuals with NF1.
• These findings highlight potential neuromuscular involvement in NF1, impacting physical function.