Scientific Commons: T. J. Doubt

Methods to Obtain Blood Samples Periodically During Exercise Research Studies While Subjects are Immersed in Water or Otherwise Inaccessible (2006)

Thorp, J. W., Roberts, J. R., Doubt, T. J.

We describe a method to obtain periodic blood samples during exercise studies by use of an indwelling intravenous catheter. A step-by-step process for establishing the intravenous line and obtaining...

Effects of Serial Wet-Dry-Wet Cold Exposure: Thermal Balance, Physical Activity, and Cognitive Performance (2002)

Doubt, T. J., Weinberg, R. P., Hesslink, R. L., Ahlers, S. T.

Thermal balance, physical performance, and cognitive function were examined in 7 U.S. Navy divers who each performed two 7-hour cold exposures while wearing a TLS dry suit with M-400 Thinsulate...

Physical Fitness Training Program for Research Saturation Divers. (2002)

Doubt,T. J., Mecocci,F. M.

A physical fitness training program is descrived for diver research subjects. THe program incorporates the concepts of strength and endurance into total body fitness. Special emphasis is placed upon...

Preliminary Studies of Exercise Capacity in Combat Swimmers after Cold Water Training Operations (2002)

Doubt, T. J., Weinberg, R. P., Baker, C. D., Flynn, E. T.

Four special warfare combat swimmers performed exercise before and after open water training exercises in swimmer delivery vehicles. The divers wore standard issue dry suits. The water temperature...

Leg and Forearm Muscle Power Changes Associated with Two Types of Underwater Exposure. (1998)

Doubt,T. J., Knafelc,M. E., Russell,R. P., Baker,C. L., Flynn,E. T.

Forearm muscle strength and leg muscle power were studied in 26 Explosive Ordnance Disposal (EOD) and 5 Special Warfare Swimmer Delivery Vehicle (SDV) divers. Control tests were done on non-driving...

Use of Self-Induced Hypnosis to Modify Thermal Balance during Cold Water Immersion. (1998)

Mittleman, K. D., Doubt, T. J., Gravitz, M.

This study was designed to evaluate the efficacy of self-induced post-hypnotic suggestion to improve physical and thermogenic responses to two cycles of alternating rest and exercise during head-out...

Dietary Plans for Carbohydrate Loading. (1998)

Doubt, T. J., Thorp, J. W.

This report provides dietary plans suitable for carbohydrate loading (i.e., increasing carbohydrate intake in order to increase body glycogen stores). Two separate 7 day diet plans are presented,...

Work Enhancement and Thermal Changes during Intermittent Work in Cool Water after Carbohydrate Loading. (1998)

Thorp, J. W., Mittleman, K. D., Haberman, K. J., House, J. F., Doubt, T. J.

We evaluated the effect of carbohydrate loading (TEST) vs control diet (CON) on the thermal status and the ability of 8 U.S. Navy divers to perform intermittent leg exercise at 80% max Oxygen 2...

Pyridostigmine and Warm Water Diving Protocol 90-05. 1. Protocol and General Results, (1998)

Doubt, T. J., Dutka, A. J.

A study was conducted to determine whether pre-treatment with pyridostigmine affected performance of divers in warm water. This report contains a review of pyridostigmine effects, experimental...

Pyridostigmine and Warm Water Diving Protocol 90-05. 4. Physical Performance. (1998)

Doubt, T. J., Roberts, J. R., Taylor, N. A., Weinberg, R. P., Holmes, N. E.

The effect of pretreatment with pyridostigmine on exercise performance was studied on 10 heat-acclimated divers performing light to moderate work for 3 h in 34.4 C (94 F) water at a depth of 20 feet...

COLDEX-86: Physical Work Capacity during Prolonged Cold Water Immersion at 6.1 msw. (1998)

Doubt, T. J., Smith, D. J.

Response to submaximal leg exercise was quantified in 16 U.S. Navy divers who performed whole body immersions in 5 C water for periods of up to 6 h. Diverse wore passive dry suit thermal protection....

COLDEX-86: Fluid and Electrolyte Changes during Prolonged Cold Water Immersion. (1998)

Deuster, P. A., Smith, D. J., Smoak, B. L., Montgomery, L. C., Doubt, T. J.

Dehydration and hypothermia are major inhibitors of diver performance in cold water. To characterize the dehydration that accompanies cold water immersion, 16 U.S. Navy divers participated in two...

COLDEX-86: Summary of the Experimental Protocol and General Results. (1998)

Doubt, T. J., Weinberg, R. P., Smith, D. J., Deuster, P. A., Dutka, A. J.

Aspects of temperature regulation, exercise capacity, and passive rewarming were evaluated during planned 6 h immersions in 5 deg C (41 deg F) water. A total of 16 divers (12 First Class divers, 4...

COLDEX-86. Event-Related Potentials after Prolonged Cold Water Immersion: Possible Evidence for Impairment of Cognitive Function with Minimal Lowering of Core Temperature. (1998)

Dutka, A. J., Smith, D. J., Doubt, T. J., Weinberg, R. P., Flynn, E. T.

Mild hypothermia may be associated with defects in mental performance, including changes in memory and reaction time. The P3 is an electrical response of the brain to unexpected stimuli, and the...

Pyridostigmine and Warm Water Diving Protocol 90-05: 2. Thermal Balance. (1998)

Hyde, D., Weinberg, R. P., Stevens, D. M., Doubt, T. J.

A study was conducted to evaluate whether pretreatment with pyridostigmine affected the thermal balance of divers in warm water conditions. Ten U.S. Navy divers participated in three separate 7-hour...

Thorp, J. W., Doubt, T. J.

This report describes fifteen daily menus suitable for divers participating in research or operational saturation dives. The menus were developed and tested for acceptability during a series of...

Preliminary Diet and Hydration Guidelines for Diving to Depths to 150 FSW. (1998)

Doubt, T. J., Thorp, J. W., Deuster, P. A.

This report provides a brief review of dietary and hydration changes associated with immersion and hyperbaric exposures to a depth of 150 feet seawater (fsw), and recommendations for ensuring...

Loss of Body Fluid after Open-Water Dives Conducted at Night in Warm Water. (1998)

Doubt, T. J.

Changes in body weight were recorded in 9 divers after nighttime dives in 26 degC (78 degF) water lasting 2-5 hours. A total of 34 manned dives were made during March-April 1991 as part of operator...

Weight Loss After AM and PM SDV Dives and Use of DDAVP. (1998)

Doubt, T. J., Thorp, J. W.

Post-dive weight loss, as an estimate of body fluid loss, was obtained in 13 SEALs after 28 daytime (AM) and 66 nighttime (PM) man-dives in a SEAL Delivery Vehicle (SDV). Water temperature was 26 C....

An Analysis of Physically Demanding Tasks Performed by U.S. Navy Fleet Divers. (1998)

Marcinik, E. J., Schibly, B. A., Hyde, D., Doubt, T. J.

In an effort to better align the physical capabilities of U.S. Navy fleet divers with occupational physical requirements, the objectives of this research investigation were to: (1) Develop a general...

Prolonged whole body immersion in cold water: hormonal and metabolic changes (1990)

D. J. Smith, P. A. Deuster, C. J. Ryan, T. J. Doubt

Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )

Lack of diurnal effects on periodic exercise during prolonged cold water immersion (1990)

T. J. Doubt, D. J. Smith

Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )

Fluid and cation changes during head-out immersions in 25 degrees and 35 degrees C water (1989)

P. A. Deuster, T. J. Doubt, C. J. Ryan, L. C. Montgomery, K. J. Haberman

Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )

Nutritional status of land-based U.S. Navy divers (1988)

A. Singh, P. A. Deuster, B. A. Day, D. J. Smith, J. E. DeBolt, T. J. Doubt

Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )