| Secondary |
| Kongerud |
| 1991 |
| Norway |
| LMW |
| Metals |
| Aluminum |
| Aluminum potroom workers |
| Work-related asthmatic symptoms (dyspnea, wheezing) |
| Use of respiratory equipment (powered respirator helmet - 1 week, disposable mask - 1 week) |
| 19 of 25 eligible subjects (Participation rate: 76%) |
| Fifteen of 19 subjects had higher peak expiratory flow rate (p<0.01) during the helmet period than non-helmet period. The mean symptom score was higher in the non-helmet period, but the difference in symptom reporting between the two periods was not statistically significant (p=0.38). |
