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12. Responses of Soldiers to 4-gram and 8-gram NaCl Diets During 10 Days of Heat Acclimation
Pages 247-258

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From page 247...
... However, observations made in hot environments (National Research Council, 1989b) suggest that this dietary recommendation may be inadequate because of increased daily Na+ losses during exercise in the heat.
From page 248...
... (Armstrong et al., 1985; Conn, 1963) and dietary Na+ intake (Dahl, 1958; National Research Council, 1989b)
From page 249...
... ad libitum from canteens during treadmill walking and rest periods. Body weight was maintained each hour by requiring that subjects drink a volume of pure water, at the end of each rest period, that matched the amount of body mass not replaced by ad libitum drinking.
From page 250...
... were identified for total plasma protein in LNA and MNA (day 8 versus days 11, 15, 17; p < .01) , even though PV expansion exhibited
From page 251...
... The significant between-diet (LNA versus MNA) differences (p < .05 to .001)
From page 252...
... , morning body mass, and morning urine specific gravity indicated no LNA versus MNA differences. With respect to HA trials, there were no between-diet differences in total distance walked, in HR, in Tre, in sweat rate, or in six out of seven blood variables (Table 12-2~.
From page 253...
... 253 Ct 11 s _' ¢ CQ 4— ._ +Ct a, Cal a, o Ct oo 11 S _' ~ Ct oo Cal Cal o Cal ._ so Cal — o .= Cal ._ — o ~ o 4,]
From page 254...
... This is exactly opposite the hormonal status desired, especially if secondary challenges (that is, decreased food consumption, increased work requirements) are presented, and it could lead to an increased incidence of heat illness (Hubbard and Armstrong, 1988; Hubbard et al., 19861.
From page 255...
... Although each subject lost approximately 60 liters of sweat during the 10-day course of HA, no subject exhibited the symptoms of salt-depletion heat exhaustion (vertigo, hypotension, tachycardia, and vomiting; see Hubbard and Armstrong, 1988) , heat cramps, or heat syncope during the 10 days of HA.
From page 256...
... 119:245268. National Research Council 1989a Diet and Health: Implications for Reducing Chronic Disease Risk.
From page 257...
... Keys 1944 The effect of sodium chloride intake on the work performance of man during exposure to dry heat and experimental heat exhaustion.
From page 258...
... Other than that, there were no between-diet or between-day differences. The two spikes came, interestingly, the day before heat acclimation and day after heat acclimation began.


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