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UNITED STATES
UNITED STATES
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Session 1 from the 2021 ACSM/GSSI Go the Distance Summer Symposium features Matt Pahnke PhD of GSSI and U.S. Long-Distance runner Molly Huddle. Dr. Pahnke presents the science and recommendations for fueling endurance athletes and then discusses how to utilize those recommendations in practice with Molly. Each athlete is unique and personalizing sports nutrition recommendations is key to helping an endurance athlete build a successful training and race day nutrition plan.
Course Objectives
Idenfity the key sports nutrition recomendations for endurance athletes
Discuss and apply the scientific recommendations for enduracne sports nutrition in a practical setting
Course
Credits
Course Expiration
ACSM
.75
07/14/2024
CSCCa
0.75
07/14/2024
Fatigue during high intensity sports or activities (~1-10 minutes in length) is caused by several components with strong evidence that muscle acidosis via accumulating hydrogen ions is a key performance inhibitor. To address this issue, skeletal muscle has intra and extracellular buffering mechanisms to attenuate exercise induced acidosis. Carnosine is an intracellular buffer that is key in slowing the decline of muscle pH. Carnosine has a nitrogen containing imidazole side ring which accepts or buffers hydrogen. This buffering can contribute as much as 15% of total buffering capacity. Additionally, carnosine has been shown to be a calcium/hydrogen exchanger, delivering calcium back to the sarcoplasmic reticulum and hydrogen away to the cell membrane. This suggests that carnosine may increase calcium sensitivity and muscle contraction efficiency. Plasma beta-alanine is the rate limiting substrate of carnosine. Approximately 3-6 g/d of beta-alanine supplementation over at least four weeks can elevate muscle carnosine stores by 30-60%. Several meta-analyses have been conducted and has shown 2-3% increased performance in non-elite athletes, followed with just 0.5-1% increased performance in elite athletes.
Course Objectives
Course
Credits
Course Expiration
ACSM
1
06/24/2024
BOC
1
06/23/2024
Commission on Dietetic Registration
1
06/23/2024
CSCCa
1
06/23/2024
During exercise, both fat and carbohydrate are metabolized to produce energy. At lower intensities and rest, fat is the predominate substrate that is metabolized. As intensity increases, carbohydrate metabolism increases and fat metabolism decreases. Incremental exercise tests have been developed on both a cycle ergometer and treadmill to measure the maximal fat oxidation (MFO) and at what intensity MFO occurs (FATMAX). It has been shown that there is large individual variation in MFO and FATMAX, and that individuals may have a unique FATMAX curve. Increasing an athlete’s fat oxidation may be beneficial as it could preserve the limited amount of muscle and liver glycogen, which could then delay fatigue. Several nutritional supplements thought to increase fat oxidation have been studied, such as; green tea, New Zealand blackcurrants, caffeine, and Omega-3. In addition to supplementation, training strategies to decrease muscle and liver glycogen availability prior to exercise have been shown to increase fat oxidation during exercise. It is important to note that an increase in fat oxidation during exercise has not been associated with improved performance.
Course Objectives
Course
Credits
Course Expiration
ACSM
1
10/20/2023
BOC
1
10/20/2023
Commission on Dietetic Registration
1
10/20/2023
CSCCa
1
10/20/2023
High altitude training camps are commonly used by endurance athletes in order to increase their fitness prior to competition. Energy availability (EA) requirements may be altered by low to moderate altitudes, and it is suggested that EA may play a role in an athlete’s ability to adjusts to hypoxic conditions. Iron is a micronutrient with known importance to an athlete’s health while at altitude and is important for increasing hemoglobin mass. While studies investigating physiological adaptations at extreme altitudes (>3,000 m.) have been conducted, there is a call for more studies at low to moderate altitudes (1,600-2,400 m.). Since the effects of training at low to moderate altitudes are not yet fully confirmed, it is best to apply sea-level nutrition and hydration guidelines to an athlete’s training at altitude.
Course Objectives
Course
Credits
Course Expiration
ACSM
1
10/07/2023
BOC
1
10/07/2023
Commission on Dietetic Registration
1
10/07/2023
CSCCa
1
10/07/2023