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TABLE 6-5 Mean Oxygen Uptake during Rest, Moderate Activity, and Heavy Activity by Young Men (n = 7) in a Room Maintained at Different Temperatures

 

Mean Oxygen Uptake (ml per minute)

Intensity of Activity

21.1°C (70°F)

29.4°C (85°F)

37.7°C (100°F)

Percent

Rest

273

282

304*

11.4

Moderate

521

525

590*

13.3

Heavy

1422

1404

1570*

11.7

* p ≤ 0.05, i.e., effect of 100°F > 85°F or 70°F.

Fifty minutes on cycle ergometer.

Fifty minutes on cycle ergometer at 120 watts.

SOURCE: Adapted from Consolazio et al. (1963).

study by Welch et al. were nonsignificant, there appeared to be a trend for a higher energy expenditure during walking in a hot desert environment when expressed either as kcal per hour or kcal per kg per hour, where kg represents total weight transported. However, more recent studies have failed to find significant differences (Klausen et al., 1967; Rowell et al., 1969; Sen Gupta et al., 1977; Shvartz et al., 1977; Young et al., 1985).

Shvartz et al. (1977) clearly indicated little difference in metabolic rate with ergometer exercise prior to heat acclimation (see Table 6-8). Sen Gupta et al. (1977) raised the possibility that although total energy expenditure during submaximal exercise was not different when the exercise was

TABLE 6-6 Oxygen Uptake by Young Men (n = 7) Performing Different Types of Exercise* in a Desert Environment, Yuma, Arizona

 

Oxygen Uptake (ml per minute)

Exercise Type

Sun (37.8°C)

Shade (37.8°C)

Indoors (26°C)

Bicycle 1

754

683

641

Bicycle 2

813

751

681

Treadmill

1156

1197

1110

Resting

340

322

314

* Two separate cycle ergometer rides that are indicated here as bicycle 1 and 2.

p < 0.05.

SOURCE: Adapted from Consolazio et al. (1970).



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