Effects of a multi-nutrient supplement on exercise performance and hormonal responses to resistance exercise

Abstract

The purpose of this study was to determine the influence of a comprehensive multi-component nutritional supplement on performance, hormonal, and metabolic responses to an acute bout of resistance exercise. Nine healthy subjects ingested either Muscle Fuel (MF) or a matched placebo (PL) for 7 days. Subjects then reported to the laboratory, ingested the corresponding supplement, and performed two consecutive days of heavy resistance exercise testing with associated blood draws. MF supplementation improved vertical jump (VJ) power output and the number of repetitions performed at 80% of one repetition maximum (1RM). Additionally, MF supplementation potentiated growth hormone (GH), testosterone, and insulin-like growth factor-1 responses to exercise. Concentrations of circulating myoglobin and creatine kinase (CK) were attenuated immediately following resistance exercise during the MF trial, indicating that MF partially mediated some form of exercise-induced muscle tissue damage. In summary MF enhanced performance and hormonal responses associated with an acute bout of resistance exercise. These responses indicate that MF supplementation augments the quality of an acute bout of resistance exercise thereby increasing the endocrine signaling and recovery following heavy resistance exercise.

Influence of glutamine on the effect of resistance exercise on cardiac ANP in rats

“…For instance, feeding subjects before and/or immediately after resistance exercise alters hormone response (Kraemer and Volek, 1998;Kraemer et al, 2007;Gulli et al, 2012). In addition to feeding, various nutritional supplements (herbs, vitamins, and micronutrients) improve responses and adaptations to resistance exercise.…”

“…In addition to feeding, various nutritional supplements (herbs, vitamins, and micronutrients) improve responses and adaptations to resistance exercise. Nutritional supplements such as creatine, l-carnitine and l-glutamine positively affect strength development and resistance exercise recovery (Williams et al, 2002;Kraemer and Volek, 1998;Kraemer et al, 2007;Rawson and Volek, 2003;Volek and Rawson, 2002;Cermak et al, 2012;Wax et al, 2012). One of these nutritional supplements, glutamine have been widely used by athletes (Mero et al, 2009).…”

Effects of a whole body compression garment on recovery after a heavy resistance

“…The feelings of reduced fatigue and vitality may well have been because of the garment removal after 24 hours but might also reflect the gestalt of lower amounts of soft tissue damage as well. Nevertheless, such feelings are important for exercise readiness (23). It had been previously noted in extreme damage repair conditions, and use of a compressive sleeve resulted in greater discomfort over the first 24 hours and it produced a dramatic reduction in edema because of water being pushed out of the tissue biocompartment into the circulatory biocompartment via the compressive mechanical blocking (20).…”

Is it helpful to study a commercial multi-nutrient supplement on exercise performance?

“…With interest we read the article of Kraemer and colleagues, "EVects of a multi-nutrient supplement on exercise performance and hormonal responses to resistance training" (Kraemer et al 2007) which aimed to determine the eVects of the comprehensive nutritional supplement, Muscle Fuel™ on performance, hormonal, and recovery responses to an acute bout of exercise. Although we appreciate the eVort and design of the study, some concerns should be mentioned.…”

“…Although we appreciate the eVort and design of the study, some concerns should be mentioned. As discussed by the authors, Muscle Fuel™ contains numerous ingredients and it is, therefore, "impossible to determine which ingredient(s) provided the primary ergogenic response" (Kraemer et al 2007). Nevertheless, we think that the ingestion of creatine and caVeine may have been of major relevance for the improvements in performance in this study, as this has been shown in previous studies (Racette 2003;Rawson and Volek 2003;Volek 2003;Spriet and Gibala 2004).…”