A deterministic model of the vertical jump : Implications for training
- Ham, Daniel, Knez, Wade, Young, Warren
- Authors: Ham, Daniel , Knez, Wade , Young, Warren
- Date: 2007
- Type: Text , Journal article
- Relation: Journal of Strength and Conditioning Research Vol. 21, no. 3 (2007), p. 967-972
- Full Text:
- Reviewed:
- Description: A deterministic model of the vertical jump: implications for training. J. Strength Cond. Res. 21(3):967-972. 2007. - Increasing vertical jump height is a critical component for performance enhancement in many sports. It takes on a number of different forms and conditions, including double and single legged jumps and stationary and run-up jumps. In an attempt to understand the factors that influence vertical jump performance, an extensive analysis was undertaken using the deterministic model. Once identified, practical training strategies enabling improvement in these factors were elucidated. Our analysis showed that a successful vertical jump performance was the result of a complex interplay of run-up speed, reactive strength, concentric action power of the take-off leg(s), hip flexors, shoulders, body position, body mass, and take-off time. Of special interest, our analysis showed that the concentric action power of the legs was the critical factor affecting stationary double leg vertical jumps, whereas reactive strength was the critical component for a single leg jump from a run-up. © 2007 National Strength & Conditioning Association.
- Description: C1
- Description: 2003005651
- Authors: Ham, Daniel , Knez, Wade , Young, Warren
- Date: 2007
- Type: Text , Journal article
- Relation: Journal of Strength and Conditioning Research Vol. 21, no. 3 (2007), p. 967-972
- Full Text:
- Reviewed:
- Description: A deterministic model of the vertical jump: implications for training. J. Strength Cond. Res. 21(3):967-972. 2007. - Increasing vertical jump height is a critical component for performance enhancement in many sports. It takes on a number of different forms and conditions, including double and single legged jumps and stationary and run-up jumps. In an attempt to understand the factors that influence vertical jump performance, an extensive analysis was undertaken using the deterministic model. Once identified, practical training strategies enabling improvement in these factors were elucidated. Our analysis showed that a successful vertical jump performance was the result of a complex interplay of run-up speed, reactive strength, concentric action power of the take-off leg(s), hip flexors, shoulders, body position, body mass, and take-off time. Of special interest, our analysis showed that the concentric action power of the legs was the critical factor affecting stationary double leg vertical jumps, whereas reactive strength was the critical component for a single leg jump from a run-up. © 2007 National Strength & Conditioning Association.
- Description: C1
- Description: 2003005651
The effect of an 8 week prescribed exercise and low-carbohydrate diet on cardiorespiratory fitness, body composition and cardiometabolic risk factors in obese individuals: A randomised controlled trial
- Perissiou, Maria, Borkoles, Erika, Kobayashi, Kent, Polman, Remco
- Authors: Perissiou, Maria , Borkoles, Erika , Kobayashi, Kent , Polman, Remco
- Date: 2020
- Type: Text , Journal article
- Relation: Nutrients Vol. 12, no. 2 (2020), p. 482
- Full Text:
- Reviewed:
- Description: Low-carbohydrate (LC) diets are an effective method for treating obesity and reducing cardiometabolic risk. However, exposure to LC diets is associated with reductions in muscle mass and increased osteoporosis risk in obese individuals. The combination of exercise with a LC diet appears to attenuate muscle mass loss induced by LC diets alone, and to further improve cardiometabolic profile. However, evidence to date in obese individuals is limited. We assessed the effect of LC diet in combination with supervised exercise on cardiorespiratory fitness, body composition and cardiometabolic risk factors in obese individuals. Male and female participants in the experimental (EX-LC structured supervised exercise program + low-carbohydrate meals n = 33 35.3 years) and control (EX-CO structured supervised exercise program + standard dietary advice n = 31 34.2 years) conditions underwent measurements of cardiorespiratory fitness ( O peak), body fat, lean muscle mass (LMM), and cardiometabolic biomarkers before and after an 8 week intervention. : Participants in the EX-LC condition demonstrated greater improvements in O peak ( = 0.002) and fat mass index (FMI, = 0.001) compared to the EX-CO condition. Achieving a ketogenic state (β-hydroxybutyrate, βHB ≥0.3 mmol/L) was associated with greater reductions in total body fat ( = 0.011), visceral adipose tissue ( = 0.025), FMI ( = 0.002) and C-reactive protein (CRP, = 0.041) but also with greater reductions in LMM ( = 0.042). : Short-term LC diet combined with prescribed exercise enhanced cardiorespiratory fitness and the cardiometabolic profile of obese individuals but was also associated with greater muscle mass loss compared to similar exercise training and standard dietary advice. The long-term effects of the LC diet should be further explored in future studies.
- Authors: Perissiou, Maria , Borkoles, Erika , Kobayashi, Kent , Polman, Remco
- Date: 2020
- Type: Text , Journal article
- Relation: Nutrients Vol. 12, no. 2 (2020), p. 482
- Full Text:
- Reviewed:
- Description: Low-carbohydrate (LC) diets are an effective method for treating obesity and reducing cardiometabolic risk. However, exposure to LC diets is associated with reductions in muscle mass and increased osteoporosis risk in obese individuals. The combination of exercise with a LC diet appears to attenuate muscle mass loss induced by LC diets alone, and to further improve cardiometabolic profile. However, evidence to date in obese individuals is limited. We assessed the effect of LC diet in combination with supervised exercise on cardiorespiratory fitness, body composition and cardiometabolic risk factors in obese individuals. Male and female participants in the experimental (EX-LC structured supervised exercise program + low-carbohydrate meals n = 33 35.3 years) and control (EX-CO structured supervised exercise program + standard dietary advice n = 31 34.2 years) conditions underwent measurements of cardiorespiratory fitness ( O peak), body fat, lean muscle mass (LMM), and cardiometabolic biomarkers before and after an 8 week intervention. : Participants in the EX-LC condition demonstrated greater improvements in O peak ( = 0.002) and fat mass index (FMI, = 0.001) compared to the EX-CO condition. Achieving a ketogenic state (β-hydroxybutyrate, βHB ≥0.3 mmol/L) was associated with greater reductions in total body fat ( = 0.011), visceral adipose tissue ( = 0.025), FMI ( = 0.002) and C-reactive protein (CRP, = 0.041) but also with greater reductions in LMM ( = 0.042). : Short-term LC diet combined with prescribed exercise enhanced cardiorespiratory fitness and the cardiometabolic profile of obese individuals but was also associated with greater muscle mass loss compared to similar exercise training and standard dietary advice. The long-term effects of the LC diet should be further explored in future studies.
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