class Weightlifting

Public Class Methods

kilos_to_pounds(kilos) click to toggle source

# File lib/weightlifting.rb, line 44
def self.kilos_to_pounds(kilos)
  kilos * 2.20462262185
end

pounds_to_kilos(pounds) click to toggle source

# File lib/weightlifting.rb, line 40
def self.pounds_to_kilos(pounds)
  pounds / 2.20462262185
end

sinclair_coeff_female(bodyweight_kg) click to toggle source

WOMEN:

A = 0.783497476
b = 153.655 kg

# File lib/weightlifting.rb, line 14
def self.sinclair_coeff_female(bodyweight_kg)
  sinclair(bodyweight_kg, 0.783497476, 153.655)
end

sinclair_coeff_male(bodyweight_kg) click to toggle source

MEN:

A = 0.751945030
b = 175.508 kg

# File lib/weightlifting.rb, line 7
def self.sinclair_coeff_male(bodyweight_kg)
  sinclair(bodyweight_kg, 0.751945030, 175.508)
end

wilks_coeff_female(bodyweight_kg) click to toggle source

Value for women are: a=594.31747775582 b=-27.23842536447 c=0.82112226871 d=-0.00930733913 e=4.731582E-05 f=-9.054E-08

# File lib/weightlifting.rb, line 36
def self.wilks_coeff_female(bodyweight_kg)
  wilks(bodyweight_kg, 594.31747775582, -27.23842536447, 0.82112226871, -0.00930733913, 0.00004731582, -0.00000009054)
end

wilks_coeff_male(bodyweight_kg) click to toggle source

Values for men are: a=-216.0475144 b=16.2606339 c=-0.002388645 d=-0.00113732 e=7.01863E-06 f=-1.291E-08

# File lib/weightlifting.rb, line 25
def self.wilks_coeff_male(bodyweight_kg)
  wilks(bodyweight_kg, -216.0475144, 16.2606339, -0.002388645, -0.00113732, 0.00000701863, -0.00000001291)
end

Private Class Methods

sinclair(bodyweight, a, b) click to toggle source

en.wikipedia.org/wiki/Sinclair_Coefficients Sinclair Coefficient = 10^(-AX^2) and X = log_10(x/b) x = Athletes bodyweight (kilograms)

# File lib/weightlifting.rb, line 52
def self.sinclair(bodyweight, a, b)
  if (bodyweight >= b)
    1.0
  end
  @coefficient = 10**(a * (Math::log10(bodyweight/b)**2))
end

wilks(bodyweight, a, b, c, d, e, f) click to toggle source

en.wikipedia.org/wiki/Wilks_Coefficient 500 / (a + bx^2 + cx^3 + dx^4 + ex^5 + fx^6) x = Athletes bodyweight (kilograms)

# File lib/weightlifting.rb, line 62
def self.wilks(bodyweight, a, b, c, d, e, f)
  500 / (a + (b * bodyweight) + (c * bodyweight**2) + (d * bodyweight**3) + (e * bodyweight**4) + (f * bodyweight**5))
end