Skip to main content
Fashion and Textiles

International Journal of Interdisciplinary Research

Table 2 Effect of the total helmet weight on the muscle strain of the left splenius capitis during sitting, horizontal lifting and prone shooting described as changes in %MVC (N = 8)

From: Physiological and psychological neck load imposed by ballistic helmets during simulated military activities

Movements

NH

LH

HH

HH and NVD

P value

 Sitting

 

 %MVC

1.99 ± 1.26

2.21 ± 1.34

2.73 ± 1.38

2.60 ± 1.90

 ΔHEL

1.0 ± 0.0

1.24 ± 0.91

1.70 ± 1.67

1.42 ± 0.88

 ΔMOV

1.0 ± 0.0

1.0 ± 0.0

1.0 ± 0.0

1.0 ± 0.0

Horizontal lifting

 %MVC

3.81 ± 1.69

5.06 ± 2.46

4.97 ± 2.30

6.09 ± 2.80†

0.014

 ΔHEL

1.0 ± 0.0

1.19 ± 0.25

1.25 ± 0.29

1.57 ± 0.34

 

 ΔMOV

2.7 ± 1.5

2.8 ± 1.5

2.4 ± 1.3

3.3 ± 2.2

 

Prone shooting

 %MVC

7.07 ± 3.67

9.05 ± 3.98

8.97 ± 5.36

9.17 ± 3.50

0.919

 ΔHEL

1.0 ± 0.0

1.20 ± 0.58

1.29 ± 0.47

1.33 ± 0.60

 

 ΔMOV

6.3 ± 5.4

5.4 ± 4.8

5.8 ± 5.9

5.1 ± 4.1

 

P

    

–

  1. %MVC muscle strain normalized by its maximal voluntary contraction activity, ΔHEL a mean of individual changes in %MVC in comparison with NH (in times), ΔMOV a mean of individual changes in %MVC compared to the sitting posture (in times), NH No Helmet, LH 1.15 kg helmet, HH 1.5 kg helmet, HH and NVD 1.5 kg helmet with a night vision device (total weight = 2.1 kg)
  2. The values represent the neck pain when each posture lasted for 8 min. Data are shown as the mean ± SD
  3. †P < 0.05 indicates the helmet effects versus NH; Friedman test used for identifying the group differences using a Wilcoxon test as a post-hoc test
Back to article page