Michael B Williams | PubMed Health

PubMed2003

Effects of recovery beverages on glycogen restoration and endurance exercise performance.

The restorative capacities of a high carbohydrate-protein (CHO-PRO) beverage containing electrolytes and a traditional 6% carbohydrate-electrolyte sports beverage (SB) were assessed after glycogen-depleting exercise. Postexercise ingestion of the CHO-PRO beverage, in comparison with the SB, resulted in a 55% greater time to exhaustion during a subsequent exercise bout at 85% maximum oxygen consumption (VO(2)max). The greater recovery after the intake of the CHO-PRO beverage could be because of a greater rate of muscle glycogen storage. Therefore, a second study was designed to investigate the effects of after exercise CHO-PRO and SB supplements on muscle glycogen restoration. Eight endurance-trained cyclists (VO(2)max = 62.1 +/- 2.2 ml.kg(-1) body wt.min(-1)) performed 2 trials consisting of a 2-hour glycogen-depletion ride at 65-75% VO(2)max. Carbohydrate-protein (355 ml; approximately 0.8 g carbohydrate (CHO).kg(-1) body wt and approximately 0.2 g protein.kg(-1) body wt) or SB (355 ml; approximately 0.3 g CHO.kg(-1) body wt) was provided immediately and 2 hours after exercise. Trials were randomized and separated by 7-15 days. Ingestion of the CHO-PRO beverage resulted in a 17% greater plasma glucose response, a 92% greater insulin response, and a 128% greater storage of muscle glycogen (159 +/- 18 and 69 +/- 32 micromol.g(-1) dry weight for CHO-PRO and SB, respectively) compared with the SB (p < 0.05). These findings indicate that the rate of recovery is coupled with the rate of muscle glycogen replenishment and suggest that recovery supplements should be consumed to optimize muscle glycogen synthesis as well as fluid replacement.

Adult↗

PubMed2002

Future AAC technology needs: consumer perspectives.

This article suggests the need for rethinking the role that consumer perspectives will play (and ought to play) in the design and development of future augmentative and alternative communication (AAC) technologies. After carefully defining what they mean by "AAC consumers," "consumer perspectives," and "AAC technologies," the authors consider the extent to which current research has illuminated our understanding of (1) how consumers view AAC technologies and (2) how consumers themselves would define future technology needs. It's not a pretty picture. While it is clear that there already exist specific constructs and methods that could enable researchers and developers to learn more about consumer perspectives, it is equally clear that few, if any, researchers make much use of these constructs and methods. The authors focus specifically on ways that consumer perspective can helpfully infuse participatory action research, technology transfer processes, and ergonomics. In addition, the authors consider how research that investigates the ways in which assistive technologies impact the daily lives of individuals with severe communication impairment also influences public policy issues, which can in turn affect future definitions of AAC technology needs. Throughout the article, the authors advocate for a paradigm shift in the quantity and quality of the collaborations that occur between AAC consumers and AAC researchers, manufacturers, and developers. Augmented communicators and their families have a major stake in all types of research that can affect the design and development of AAC devices and accessories, and the results of this research, in turn, can affect public policy decisions about AAC technologies. This makes it all the more important that AAC consumers be involved at each step of the research and development process.

Communication Devices for People with Disabilities↗