Publications by authors named "Michael D Brothers"
Iron is a micronutrient necessary for energy metabolism and for oxygen transport and delivery. Depletion of iron stores (iron deficiency [ID]) may lead to iron deficiency anemia (IDA), which affects mood, cognitive function, and physical performance. Previous studies indicated that iron status may decline during military training.
View Article and Find Full Text PDFInfluence of carbon monoxide leaks on the measurement error of total haemoglobin mass.
Scand J Clin Lab Invest
October 2011
Article Synopsis
- Total haemoglobin mass (Hb(mass)) can be accurately measured using a CO rebreathing method, but measurement errors can vary across different labs, possibly due to CO leaks.
- A study implemented a standardized leak monitoring procedure with two CO detectors to assess the impact of these leaks on Hb(mass) measurements in previous test-retest studies.
- Results showed that measurement error was lowest without any leaks (1.9%), increased with minor leaks (3.6%), and dramatically rose with major leaks (9.3%), suggesting that careful leak monitoring is crucial to ensure accurate Hb(mass) assessments.
Although acclimatization to moderate altitude (MA) is thought to be unnecessary or to require minimal adaptation, retrospective data from the U.S. Air Force Academy (USAFA), a military college located at 2210 m, suggested otherwise.
View Article and Find Full Text PDFArticle Synopsis
- The study assessed the impact of a 6-day acclimatization at 2200 m on the physiological changes and acute mountain sickness (AMS) during a quick ascent to 4300 m.
- Eleven male participants performed exercises and had various physiological measures taken before and after the 6-day staging.
- Results showed that post-staging, there were significant improvements in oxygen levels and a reduction in the incidence and severity of AMS, indicating that acclimatization helps prepare the body for higher altitudes.
GXT responses in altitude-acclimatized cyclists during sea-level simulation.
Med Sci Sports Exerc
October 2007
Purpose: This study examined the effects of gender on graded exercise stress test (GXT) response in moderate-altitude (MA)-acclimatized cyclists during sea-level (SL) simulation. It was hypothesized that alterations in arterial saturation would relate to changes in VO2peak.
Methods: Twenty competitive cyclists (12 males, 8 females) who were residents of MA locations underwent two randomized bicycle GXTs: one under local normoxic hypobaria, and the other under simulated SL conditions.
While high altitude adaptations have been studied extensively, limited research has examined moderate altitude (MA: 1500 to 3000 m) adaptations and their time course, despite the fact that millions of people sojourn to or reside at MA. We retrospectively examined long-term MA acclimatization by analyzing recurring physical fitness test results and hematological data among 2147 college-age male cadets previously residing at either sea level (SL) or MA and currently attending the U.S.
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