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Query: UMLS:C0015672 (fatigue)
 51,768 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The purpose of this study was to develop a submaximal repetitive isoinertial back muscle endurance test by defining the relationships between the power spectral indices of paraspinal muscle electromyographic (EMG) activities, endurance time and a subjective estimate of fatigue (Borg scale). Bilateral surface EMG recordings were obtained over the lumbar paraspinal muscles in ten individuals who were currently free from back pain. All subjects performed repetitive upper trunk extensions (25 degrees flexion and 5 degrees extension, 30 repetitions per min), while movement below the third lumbar vertebral body was mechanically restricted. The load level depended upon upper body mass, sex, and age. The tests continued for as long as the subjects were able to maintain the required repetition rate (endurance time). Median (MF) and mean power frequency (MPF) slopes were calculated by performing a fast Fourier transformation after confirmation of EMG stationarity by recurrence quantification analysis. MF and MPF correlations with endurance time/Borg scale were measured for the first 60 s (0.60-0.88/0.42-0.86), the first 90 s (0.62-0.89/0.52-0.90), the first 120 s (0.50-0.76/0.41-0.73), and the entire repetitive run (0.63-0.88/0.54-0.90). To test for the reproducibility of the spectral indices EMGs were recorded for 2 min during repetitive loading from the same subjects on two consecutive days. Corresponding spectral slopes of MF and MPF were correlated at 60 s (0.36-0.93), 90 s (0.58-0.92), and 120 s (0.70-0.94) at the L3-L4 and L5-S1 levels, indicating good reproducibility of results from alternate recording sessions at the L5-S1 level. It is concluded that paraspinal muscle spectral indices (MF and MPF) measured before the onset of total muscle fatigue are good predictors of endurance time and are closely related to the subjective perception of fatigue.
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PMID:Lumbar paraspinal muscle fatigability in repetitive isoinertial loading: EMG spectral indices, Borg scale and endurance time. 928 3

To obtain information to guide future health care planning, data from government and other sources on the demographic and medical characteristics of menopausal Taiwanese women were reviewed. The average age at menopause, according to a 1995-96 study of 386 menopausal women in Taipei, is 49.5 +or- 2.3 years. In 1994, women aged 50 years and over comprised 18.3% of Taiwan's female population and 8.9% of the total population. 68% of menopausal women in the 1995-96 study reported lower back pain; other common symptoms included fatigue (59%), decreased memory (55%), vaginal dryness (50%), hot flashes (49%), insomnia (46%), loss of libido (46%), dry skin (41%), and depression (40%). After menopause, the prevalence of hypertension and coronary heart disease becomes higher among women than men. In addition, bone mineral density decreases markedly and 19.8% of women 65 years of age and over have experienced vertebral fractures. About 60% of malignant neoplasms diagnosed in 1992 involved women aged 50 years and older. By age 60 years, women's risk of cancer begins to increase substantially. An estimated 80% of Taiwanese women initiate hormone replacement therapy for relief of menopausal symptoms, prevention of cardiovascular disease, and prevention and treatment of osteoporosis. Since 30% of menopausal women in Taiwan are currently widowed or unmarried, there is a need to design programs that offer psychosocial support as well as comprehensive medical care.
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PMID:Demographic characteristics and medical aspects of menopausal women in Taiwan. 934 80

The aim of this study was to compare the changes in stature following the performance of plyometric exercises using drop-jumps and a pendulum swing. Eight male participants aged 21.7 +/- 1.8 years with experience of plyometric training gave their informed consent to act as participants. Participants undertook two exercise regimens and a 15-min standing test in a random order. The exercises entailed the performance of 50 drop-jumps from a height of 0.28 m or 50 pendulum rebounds. Participants were instructed to perform maximal jumps or rebounds using a 'bounce' style. Measurements of stature were performed after a 20-min period of standing (pre-exercise), 2-min after exercise (post-exercise) and after a 20-min standing recovery (recovery). Back pain and muscle soreness were assessed using an analogue-visual scale, at each of the above times and also 24 and 36 h after the test. Peak torque during isokinetic knee extension at 1.04 rads-1 was measured immediately before and after the exercise bouts, to assess the degree of muscular fatigue. Ground/wall reaction force data were recorded using a Kistler force platform mounted in the floor for drop-jumps and vertically on the rebound wall for pendulum exercises. Drop-jumps resulted in the greatest (p < 0.05) change in stature (-2.71 +/- 0.8 mm), compared to pendulum exercises (-1.77 +/- 0.7 mm) and standing (-0.39 +/- 0.2 mm). Both exercise regimens resulted in a significant (p < 0.01) decrease in stature when compared to the standing condition. Drop-jumps resulted in significantly greater peak impact forces (p < 0.05) than pendulum exercises (drop-jumps = 3.2 +/- 0.5 x body weight, pendulum = 2.6 +/- 0.5 x body weight). The two exercise conditions both invoked a small degree of muscle soreness but there were no significant differences between conditions. Both exercise regimens resulted in a non-significant decrease in peak torque indicating a similar degree of muscular fatigue. Based on the lower shrinkage resulted and lower peak forces, it can be concluded that pendulum exercises pose a lower injury potential to the lower back than drop-jumps performed from a height of 28 cm.
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PMID:Changes in stature following plyometric drop-jump and pendulum exercises. 941 12

In spring 1996, an outbreak of Q fever occurred among residents of a rural town (population: 300) in Germany. A retrospective cohort study was conducted to ascertain the extent of the outbreak and to assess potential risk factors for illness. In July 1996, all residents > or =15 years received a self-administered questionnaire and were offered Coxiella burnetii antibody testing. Residents were considered to have probable Q fever if they had a positive result for IgM C. burnetii antibodies by ELISA or possible Q fever if they had fever > or =39 degrees C lasting >2 days and > or =3 symptoms (chills, sweats, severe headache, cough, aching muscles/joints, back pain, fatigue, or feeling ill) after 1 January 1996. Two hundred (84%) of the 239 residents aged > or =15 years either completed the questionnaire or submitted blood for antibody testing. Forty-five (23%) of these 200 met the probable or possible case definitions. Onsets of illness occurred in January-June 1996. Cases were geographically distributed throughout the town. Persons reporting contact with sheep (32% vs 18%, RR: 1.8, 95% CI: 1.1-2.9) and walking near a large sheep farm located next the town (34% vs 8%, RR: 4.5, 95% CI: 1.7-12.2) were more likely to have met the case definition than those without these exposures. Fifteen of 20 samples from the large sheep flock were positive for C. burnetii antibodies. The sheep had lambed outdoors in December 1995-January 1996 while the weather was extremely dry. The timing of the outbreak after lambing, the uniform distribution of cases throughout the town and the absence of risk factors among most case-persons suggest airborne transmission of C. burnetii from the large sheep farm.
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PMID:An outbreak of sheep-associated Q fever in a rural community in Germany. 955 80

The present study was designed to evaluate the diagnostic value of a new submaximal back extension endurance test in the classification between patients with non-specific chronic/recurrent low back trouble (LBT) and controls. The back pain questionnaires included pain duration, intensity, regularity and the Pain & Disability Index. The subjects performed dynamic back extensions on a specially designed measurement and training unit at a fixed repetition rate with a load that was based on the subject's estimated upper body mass. The degree of perceived fatigue (unmodified Borg scale, 6-20) was inquired in 15 second intervals throughout the protocol and the slope (change/minute) was calculated. The Borg scale slope increased faster and the score at the end of the test was higher in the LBT group than in the control group during the test. Receiver operating characteristics analysis revealed significant diagnostic value for the Borg scale slope (0.74) and for the Borg scale at the end of the test (0.70). We conclude that LBT patients experience fatigue faster than controls during a repetitive submaximal back extension task. The test may offer a low-risk, low-cost evaluation method for assessing the severity of LBT when combined with other relevant clinical data.
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PMID:A submaximal back extension endurance test utilising subjective perception of low back fatigue. 960 73

As with standard microsurgical procedures performed at laparotomy, laparoscopic tubal anastomosis requires great dexterity. Handling fine suture materials under magnification to anastomose tubal segments with lumens less than 3 mm in diameter while working with your hands at a distance from the tissue makes these fine movements even more difficult. This is exacerbated by the tremor induced by the fatigue caused by a prolonged laparoscopic procedure and the need for precise control. We conducted a pilot study to evaluate the feasibility of performing laparoscopic tubal anastomosis with robotic assistance in a live porcine model. Two anastomoses were performed on one uterine horn via each of the following techniques: laparoscopy, laparoscopy with robotic assistance, and open microsurgery. Immediate necropsy demonstrated all the anastomoses to be patent. There were no intraoperative complications. Laparoscopic tubal anastomosis was associated with surgeon fatigue and neck, shoulder, and back pain. The surgeons were more comfortable performing the procedure with robotic assistance. The device functioned well and without incident. This acute animal study suggests that robotic assistance in laparoscopic tubal anastomoses is safe and feasible. It enhances surgeons' dexterity and precision while reducing fatigue. It is promising for future use in chronic experimental studies.
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PMID:Robotically assisted laparoscopic tubal anastomosis in a porcine model: a pilot study. 961 65

A study was undertaken to determine the role of typhoid in febrile illness. It was found that in 1992, Salmonella typhi, the causative agent of typhoid, played a 2.3% role in 25404 diagnostic specimens sent to Mulago Hospital, Kampala, the largest hospital in Uganda. The rates of isolation fell gradually from 2.3% in 1992 to 0.3% by 1995. Instead malaria was found to play a major role in febrile illnesses. Out of 355 patients attending a private clinic in Kampala, whose blood was examined for both malaria and typhoid, 97% were positive for malaria parasites compared to 0.84% with significant O and H Salmonella typhi antibody titres of > 1:80. Also malaria parasites were found in 60% (out of 105) of patients who had had persistent fevers and in whom doctors had also requested for HIV antibodies. Those who had HIV antibodies alone were six per cent and the ones with both were 28%, a finding which showed relatively low association of malaria and HIV. Where multiple tests were requested on one patient having general malaise or body joint pains and/or constant headaches, malaria was found to play a major role (73%) compared to syphilis (4.3%) and brucellosis (13.3%). Malaria parasites were seen in normal sizes and in somehow young or stunted forms. The latter were found more often in patients who had experienced one or a combination of the following: intermittent fevers, backache, headache, tiredness, joint and/or neck pains, and who had already received treatment for malaria.
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PMID:Selected laboratory tests in febrile patients in Kampala, Uganda. 964 Aug 25

We monitored 74 crewmembers before, during, and after 3-4-d commercial short-haul trips crossing no more than one time zone per 24 h. The average duty day lasted 10.6 duty hours, with 4.5 flight hours and 5.5 flights. On trips, crewmembers slept less, woke earlier, and reported having more difficulty falling asleep, with lighter, less restful sleep than pretrip. The consumption of caffeine, alcohol, and snacks increased on trip days, as did reports of headaches, congested nose, and back pain. The study suggests the following ways of reducing fatigue during these operations: base the duration of rest periods on duty hours as well as flight hours; avoid scheduling rest periods progressively earlier across a trip; minimize early duty report times; and inform crewmembers about strategic use of caffeine and alternatives to alcohol for relaxing before sleep.
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PMID:Flight crew fatigue II: short-haul fixed-wing air transport operations. 974 36

We studied 32 helicopter pilots before, during, and after 4-5 d trips from Aberdeen, Scotland, to service North Sea oil rigs. On duty days, subjects awoke 1.5 h earlier than pretrip or posttrip, after having slept nearly an hour less. Subjective fatigue was greater posttrip than pretrip. By the end of trip days, fatigue was greater and mood more negative than by the end of pretrip days. During trips, daily caffeine consumption increased 42%, reports of headache doubled, reports of back pain increased 12-fold, and reports of burning eyes quadrupled. In the cockpits studied, thermal discomfort and high vibration levels were common. Subjective workload during preflight, taxi, climb, and cruise was related to the crewmembers' ratings of the quality of the aircraft systems. During descent and approach, workload was affected by weather at the landing site. During landing, it was influenced by the quality of the landing site and air traffic control. Beginning duty later, and greater attention to aircraft comfort and maintenance, should reduce fatigue in these operations.
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PMID:Flight crew fatigue III: North Sea helicopter air transport operations. 974 37

We monitored 32 flight crewmembers before, during, and after 4-9 d commercial long-haul trips crossing up to 8 time zones per 24 h. The average duty day lasted 9.8 h, and the average layover 24.8 h. Layover sleep episodes averaged 105 min shorter than pretrip sleep episodes. However, in two-thirds of layovers, crewmembers slept twice so that their total sleep per 24 h on trips averaged 49 min less than pretrip. Greater sleep loss was associated with nighttime flights than with daytime flights. The organization of layover sleep depended on prior flight direction, local time, and the circadian cycle. The circadian temperature rhythm did not synchronize to the erratic environmental time cues. Consequently, the circadian low point in alertness and performance sometimes occurred in flight. On trip days, by comparison with pretrip, crewmembers reported higher fatigue and lower activation; drank more caffeine; ate more snacks and fewer meals; and there were marked increases in reports of headaches, congested nose, and back pain. Scheduling strategies and countermeasures to improve layover sleep, cockpit alertness, and performance, are discussed.
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PMID:Flight crew fatigue V: long-haul air transport operations. 974 39


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