Abstract details
| Abstract-ID: | 1543 |
| Title of the paper: | The relationship between short sleep and subjective and objective fatigue index |
| Authors: | SHIODA, K., NISHIDA, M. |
| Institution: | Kanazawa Seiryo University |
| Department: | Faculty of Human Sciences |
| Country: | Japan |
| Abstract text | INTRODUCTION: Sleep is important for restoring the physiological processes that keep the body and brain properly functioning. Although there have been many reports on the relationship between sleep and fatigue, it is unclear that the details of the mechanism of recovery from subjective and objective fatigue in short sleep. The interpolated twitch technique (ITT) is widely used to assess voluntary activation (VA) of skeletal muscles (Merton, 1954). In addition, the reduction of VA in maximal efforts is the sign of central fatigue (Gandevia, 2001). The critical flicker fusion frequency (CFFF) test is useful for assessing the arousal level, and the value of CFFF decreases with fatigue (Curran et.al., 1990). Therefore, the purpose of this study was to investigate the effect of short sleep on recovery from fatigue using ITT and CFFF. METHODS: Eight healthy young adults who did not have sleep problem were recruited. They participated in two experimental conditions in random order: short sleep (1 hour) and rest conditions. They performed isometric maximum voluntary contraction (MVC) of elbow flexor muscles for assessing VA using ITT before and after condition. In addition to ITT and CFFF, subjective fatigue and sleep index were measured using Stanford Sleepiness Scale and visual analogue scale. A two-way repeated measures ANOVA was performed for each variable. All data are expressed as mean±SD. RESULTS: Subjective fatigue and sleep index were significantly decreased in sleep condition (VAS fatigue: 32.13±23.01 vs 22.38±19.62 %, VAS sleepiness: 36.00±24.04 vs 16.63±17.60 %, p<0.05). However, there was a significant trend toward a decrease in MVC in rest condition (67.52±13.65 vs 61.53±16.04 Nm, p=0.058). In addition, there was a significant trend for CFFF to decrease in both conditions (sleep: 37.47±1.95 vs 36.74±1.41 Hz p=0.055, rest: 37.12±1.25 vs 36.84±1.16 Hz, p=0.099). CONCLUSION: It was suggested that subjective and objective index of fatigue may have different effects in short sleep durations of 1 hour. References Merton PA. (1954). Voluntary strength and fatigue. J Physiol, 123, pp. 553-564. Gandevia SC. (2001). Spinal and supraspinal factors in human muscle fatigue. Physiol Rev, 81(4), pp. 1725-1789. Curran S. et al., (1990). Critical flicker fusion in normal elderly subjects; a cross-sectional community study. Curr Psychol, 9(1), pp. 25-34. |
| Topic: | Physiology |
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