Publications by authors named "Yoko Handa"
Article Synopsis
- Measured oxygen consumption and carbon dioxide output in 14 healthy young males walking at various speeds while exposed to different temperatures (23°C, 13°C, and 33°C).
- Found that walking speed significantly affected oxygen consumption but environmental temperature did not.
- Determined that economical speed (ES) was slower in hot conditions, indicating a 7% decrease in efficiency in 33°C compared to 23°C and 13°C, with heart rate and skin temperature rising in the heat.
Article Synopsis
- This study investigated the impact of sleeping altitude on acute mountain sickness (AMS) among climbers on Mt. Fuji, involving a large sample of 1,932 participants.
- The overall prevalence of AMS was found to be 31.6%, with findings suggesting that staying overnight at higher altitudes (above 2870 m) significantly increased the likelihood of experiencing AMS, while factors like sex and age did not play a significant role.
- The conclusion emphasizes that overnight stays at higher elevations are linked to a higher prevalence of AMS, highlighting the importance of altitude considerations for climbers.
Article Synopsis
- The study examined how changes in barometric pressure (P) with climate change affect heart rate (HR) during sleep at high altitude (3000 m) in 19 healthy adults.
- During the overnight stay, a significant linear decrease in HR was observed as P dropped, beginning roughly 15 minutes after the pressure change.
- Oxygen saturation levels also decreased during the night, and some participants experienced acute mountain sickness (AMS) upon waking, indicating a relationship between changes in HR, oxygen saturation, and AMS symptoms.
Whether dietary nitrate supplementation improves exercise performance or not is still controversial. While redistribution of sufficient oxygen from inactive to active muscles is essential for optimal exercise performance, no study investigated the effects of nitrate supplementation on muscle oxygenation profiles between active and inactive muscles. Nine healthy males performed 25 min of submaximal (heart rate ~140 bpm; EX) and incremental cycling (EX) until exhaustion under three conditions: (A) normoxia without drink; (B) hypoxia (FiO= 13.
View Article and Find Full Text PDFEnergy expenditure (EE) during walking includes energy costs to move and support the body and for respiration and circulation. We measured EE during walking under three different oxygen concentrations. Eleven healthy, young, male lowlanders walked on a treadmill at seven gait speeds (0.
View Article and Find Full Text PDFHoriuchi, Masahiro, Shiro Oda, Tadashi Uno, Junko Endo, Yoko Handa, and Yoshiyuki Fukuoka. Effects of short-term acclimatization at the summit of Mt. Fuji (3776 m) on sleep efficacy, cardiovascular responses, and ventilatory responses.
View Article and Find Full Text PDFWe measured oxygen consumption during walking per unit distance (C) values for 12 human healthy young males at six speeds from 0.667 to 1.639 m s (four min per stage) on a level gradient under normobaric normoxia, moderate hypoxia (15% O), and severe hypoxia (11% O).
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