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294 results on '"Saunders, Michael J."'

2. Caffeine Enhances 10-km Cycling Performance in Habitual Users Only When Preceded by Caffeine Abstinence.

Author

Griest, Timothy D., Saunders, Michael J., Womack, Christopher J., and Luden, Nicholas D.

Subjects
FOOD habits, DRUG abstinence, OXYGEN consumption, FOOD consumption, DRINKING (Physiology), DRUG withdrawal symptoms, RECREATION, ATHLETES, PHYSICAL fitness, DIETARY supplements, CYCLING, CAFFEINE, RESEARCH funding, ATHLETIC ability, ERGOMETRY
Abstract

Purpose: The primary objective was to assess the performance benefits of caffeine (CAF) supplementation in habitual users. Importantly, this investigation was designed to account for the potential confounding effects of CAF withdrawal (CAFW), which are inherent and common in previous work. Methods: Ten CAF-consuming (394 [146] mg·d−1) recreational cyclists (age 39.1 [14.9] y; maximum oxygen consumption 54.2 [6.2] mL·kg–1·min–1) completed four 10-km time trials (TTs) on a cycle ergometer. On each trial day, 8 hours before reporting to the laboratory, subjects consumed 1.5 mg·kg–1 CAF to prevent withdrawal (no withdrawal [N]) or a placebo (PLA; withdrawal [W]). Then, 1 hour prior to exercise, they received either 6 mg·kg–1 CAF or PLA. These protocols were repeated 4 times, employing all combinations of N/W and CAF/PLA. Results: CAFW did not impair TT power output (PLAW vs PLANP =.13). However, preexercise CAF only improved TT performance when compared to PLA in the W condition (CAFN vs PLAWP =.008, CAFW vs PLAWP =.04), not when W was mitigated (PLAN vs CAFNP =.33). Conclusions: These data indicate that preexercise CAF only improves recreational cycling performance when compared to bouts preceded by CAF abstinence, suggesting that habitual users may not benefit from 6 mg·kg–1 of CAF and that previous work may have overstated the value of CAF supplementation for habitual users. Future work should examine higher doses of CAF for habitual users. [ABSTRACT FROM AUTHOR]

Published
2023
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31. Trekking poles increase physiological responses to hiking without increased perceived exertion

Author

Saunders, Michael J., Hipp, G. Ryan, Wenos, David L., and Deaton, Michael L.

Subjects
Hiking -- Physiological aspects, Staffs (Sticks, canes, etc.) -- Usage, Staffs (Sticks, canes, etc.) -- Influence, Bioenergetics -- Evaluation, Energy metabolism -- Evaluation, Physiology -- Research, Health, Sports and fitness
Abstract

Trekking poles are used by hikers for improved stability and lowered leg fatigue due to increased upper body muscle involvement. However, the weight of the poles and exaggerated upper body movement when using poles may increase total energy expenditure at a given walking speed. Few studies have investigated the physiological responses of hiking with trekking poles outside the laboratory setting. The purposes of this study were to determine if trekking poles altered physiological responses to hiking on varied terrain, and whether responses between trials were dependent on the grade of the terrain. Fourteen recreational hikers completed four hiking trials over a course that included sustained sections of flat (0 [+ or -] 1% grade), steep uphill (>10% grade), gradual uphill (5% grade), gradual downhill (-5% grade) and steep downhill ( KEY WORDS energy expenditure, exercise prescription, weight management

Published
2008

40. Validation of body composition estimates in male and female distance runners using estimates from a four-component model

Author

Arngrimsson, Sigurbjorn A., Evans, Ellen M., Saunders, Michael J., Ogburn, Charles L., III, Lewis, Richard D., and Cureton, Kirk J.

Subjects
Adipose tissues -- Physiological aspects, Fat -- Physiological aspects, Runners (Sports) -- Physiological aspects, Running -- Physiological aspects, Biological sciences
Abstract

Body fat density is measured in male and female distance runners. Conclusions indicate density in the athletes does not differ significantly from control group and densitometry is a valid measurement technique.

Published
2000

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