P-3-10-05
ENERGY EXPENDITURE OF WALKING IN PATIENTS WITH SPINA BIFIDA
K. Yoshida, T. Iwaya, K. Seki (Tohoku University, Sendai, Japan)
S. Nakamura (Teikyo University, Tokyo, Japan)
In order to evaluate functional status of patients with spina bifida, we studied the relation between neurosegmental level and the energy expenditure of walking by measuring the rate of oxygen consumption (VO2) and physiological cost index (PCI).
Sixteen patients (eight males and eight females) between the ages of seven and thirty-three years were studied. The energy expenditure was measured at self-selected comfortable and fast walking speeds in consecutive lengths of 30m walkway on the floor. They were divided into three groups by Sharrard: group III L3〜4 (n=7); group IV L5 (n=3); group V S1〜2 (n=6). There was no significant difference in age, body height and body weight.
At comfortable speed walking, there were significant differences between PCI for three groups (III vs. V, IV vs. V). Although there was no significant difference between VO2 for three groups. At self-selected fast walking speed, There was no significant difference between the energy expenditure for three groups. We conclude that PCI was more sensitive than VO2, there was positive relationship between PCI and neurosegmental level.
P-3-10-06
EFFECTS OF SPECIFIC WARM-UP AT VARIOUS INTENSITIES ON INTRACELLULAR PH DURING SUBSEQUENT EXERCISE
Yoshiyuki Kato, Takaaki Ikata, Hiroaki Takai, Sinjiro Takata, Kouichi Sairyo
(Tokushima University, Tokushima, Japan)
Abstract: The effects of specific warm-up (SWU) are essentially uncertain, although performing SWU exercise are widely accepted practice among athletes. In the present study, the effects of SWU at various intensifies on intracellular pH (pHi) during subsequent intense exercise were investigated in five men, using phosphorus-31 magnetic resonance spectroscopy (31P-MRS).
After measurement of maximal voluntary contraction (MVC) of wrist flexion, the subjects performed SWU consisted of 3 sets of wrist flexions for 5 min, followed by a 3-min interval of rest. The intensity of SWU was set at 20, 30 or 40% MVC. Then, they did a set of wrist flexions at 60% MVC for 4 min as the standard exercise (SE). For the control experiment, they did SE without SWU. 31P-MRS spectra were obtained from the wrist flexor muscles to determine the inorganic phosphate (Pi)/phosphocreatine (PCr) (Pi/PCr ratio) and pHi.
The Pi/PCr ratio during SE after SWU at any intensity was not significantly different from that during SE without SWU. On the other hand, the phi during SE after SWU at 30 and 40% MVC was significantly higher than that during SE without SWU. In addition, the phi during SWU at 40% MVC was significantly lower than that at 30% MVC.
In conclusion, SWU prevented the decline in phi during subsequent exercise without wasting high-energy phosphates. The optimal intensity of SWU was 30% MVC when that of subsequent exercise was 60% MVC.
