Search results for "univaje"
showing 5 items of 5 documents
The self-reported causes of sleepiness in shift-working tram and truck drivers
2021
Identifying the causes of sleepiness in various safety-critical work environments is neces-sary for implementing more efficient fatigue management strategies. In transportation, little is known about drivers' own perceptions of these causes. Therefore, we instructed shift-working tram (n = 23) and long-haul truck drivers (n = 52) to report at the end of their shifts what made them sleepy if they felt so. These self-reports, measured on-duty sleepiness, and sleep amounts were recorded on every shift over a period of 2-3 weeks per driver. The causes of sleepiness were queried with smartphone applications and sleep logs. Sleepiness was measured with the Karolinska Sleepiness Scale (KSS) and sl…
60-Hour Sleep Deprivation Affects Submaximal but Not Maximal Physical Performance
2018
The effect of 60-h sleep deprivation (SD) on physical performance and motor control was studied. Twenty cadets were measured for aerobic performance (VO2) before and immediately after the SD period. Maximal strength and EMG of the knee extensor muscles were measured before and after 60 h of SD. Balance, reaction times and motor control were assessed every evening and morning during the SD period. Main effects were observed for heart rate (p = 0.002, partial eta squared: 0.669), VO2 (p = 0.004, partial eta squared: 0.621), ventilation (p = 0.016, partial eta squared: 0.049), and lactate concentration (p = 0.022, partial eta squared: 0.501), whereas RER remained unaltered (p = 0.213, partial …
Accumulation of sleep loss among shift-working truck drivers
2021
Sleep loss is known to contribute to road traffic accidents. Professional drivers are vulnerable to curtailment of sleep due to long driving bouts and shift work. To fill in the gap in the literature related to the buildup of sleep loss in irregular shift systems, we recorded the sleep and working hours of 47 shift-working long-haul truck drivers during a two-week period. Sleep (time in bed) was verified by actigraphy and sleep logs. Sleepiness was measured using the Karolinska Sleepiness Scale (KSS). Individual sleep need was based on self-assessments. We examined the accumulated sleep versus self-reported sleep need across the study period, using midnights as points of observation, and th…
Effects of overnight military training and acute battle stress on the cognitive performance of soldiers in simulated urban combat
2022
Understanding the effect of stress, fatigue, and sleep deprivation on the ability to maintain an alert and attentive state in an ecologically valid setting is of importance as lapsing attention can, in many safety-critical professions, have devastating consequences. Here we studied the effect of close-quarters battle (CQ battle) exercise combined with overnight military training with sleep deprivation on cognitive performance, namely sustained attention and response inhibition. In addition, the effect of the CQ battle and overnight training on cardiac activity [heart rate and root mean square of the successive differences (RMSSD)] during the cognitive testing and the relationship between ca…
60 tunnin valvomisen vaikutus aerobiseen suorituskykyyn
2006
Jani Vaara, 2006. 60 tunnin valvomisen vaikutus aerobiseen suorituskykyyn. Liikuntafysiologia. Johdatus omatoimiseen tutkimustyohon. Jyväskylän yliopisto, liikuntabiologian laitos. Tämän tutkimuksen tarkoituksena oli selvittää 60 tunnin valvomisen ja sen aikana toteuttavan esikuntatyyppisen harjoituksen vaikutuksia aerobiseen suorituskykyyn. Koehenkilöinä tutkimuksessa oli 10 Maanpuolustuskorkeakoulun kadettioppilasta (26 ± 3 v.). Valvomisjakson aikana koehenkilöt eivät nauttineet piristäviä aineita sekä heidän fyysinen aktiivisuutensa oli minimaalista. Koehenkilöt suorittivat maksimaalisen polkupyöräergometritestin 2 vuorokautta ennen valvomisjakson alkamista sekä heti sen päätyttyä. Mitat…