Biomechanics of Power clean vs. Clean and Press (edited calculations)

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Presentation transcript:

Biomechanics of Power clean vs. Clean and Press (edited calculations) Quan (Jack) Chen Biol 438

The Power Clean

Initial Clean (Power clean) Work = ΔKE + ΔPE ΔKE = 0 ΔPE = mg(hf – hi) = (43.09kg)(9.81m/s2)(1.523m-.05m) = 622.66 J Total Work = 622.66 J ΣFavg = maavg = 43.09kg(1.445m/s2) = 62.27N ΣFavg = Farms + Fgravity = 62.27N Farms = 101.09N - Fgravity = 62.27N – mg = 62.27N – 43.09kg(-9.81m/s2) Farms = 484.98 N Δtime = 1.984 - .48 = 1.50 seconds Power = Work/time = 415.11 Watts

The Squat Work = ΔKE + ΔPE ΔKE = 0 ΔPE = mg(hf – hi) = (43.09kg)(9.81m/s2)(1.523m-.7808m) = 313.74 J Total Work = 313.74 J ΣFavg = maavg = 43.09kg(.5131m/s2) = 22.11N ΣFavg = Flegs + Fgravity = 22.11N Flegs =35.90- Fgravity = 22.11N – mg = 22.11N – 43.09kg(-9.81m/s2) Flegs = 444.82N Δtime = 4.076s - 3.216s = .86s Power = Work/time = 364.81 Watts

Clean and Press

Initial Clean (Clean and Press) Work = ΔKE + ΔPE ΔKE = 0 ΔPE = mg(hf – hi) = (43.09kg)(9.81m/s2)(1.462m-.01m) = 613.78 J Total Work = 613.78 J ΣFavg = maavg = 43.09kg(1.755m/s2) = 75.62N ΣFavg = Farms + Fgravity = 75.62N Farms = 75.62N - Fgravity = 75.62N – mg = 75.62N – 43.09kg(-9.81m/s2) Farms = 498.33N Δtime = 1.58s - .248s = 1.332 seconds Power = Work/time = 460.80 Watts

Shoulder Press Work = ΔKE + ΔPE ΔKE = 0 ΔPE = mg(hf – hi) = (43.09kg)(9.81m/s2)(2.065m-1.462 m) = 254.90 J Total Work = 254.90 J ΣFavg = maavg = 43.09kg(.2193m/s2) = 9.45N ΣFavg = Farms + Fgravity = 9.45N Farms = 9.45N - Fgravity = 9.45N – mg = 9.45N – 43.09kg(-9.81m/s2) Farms = 432.16 N Δtime = 2.68s – 1.708s = .972s Power = Work/time = 262.24Watts

Comparison of Energetics Clean (PC) Squat Clean (CP) Shoulder Press Work (J) 622.66 313.74 613.78 254.9 Force (N) 484.98 444.82 498.33 432.16 Power (W) 415.11 364.81 460.8 262.24 Time (s) 1.5 0.86 1.332 0.972

Kinetic Energy and Potential Energy Comparisons

Conclusions Power Clean and Clean and Press have very similar time courses Power cleans require work, but the force exerted by the legs is only slightly larger than the force exerted by the arms in the clean and press KE and PE graphs show more potential energy differences in power cleans than in clean and press. There is also more kinetic energy in the squat than the shoulder press due to larger range of movement (thus changes in velocity). Power cleans are great for overall more energy expenditure Both great lifts