﻿Ill 
  

  

  Effect 
  of 
  Exercise 
  and. 
  Humid 
  Heat 
  upon 
  Pulse 
  Rate, 
  Blood, 
  

   Pressure, 
  Body 
  Temperature, 
  and. 
  Blood 
  Concentration. 
  

   By 
  W. 
  J. 
  Yotjxg, 
  A. 
  Beeinl, 
  J. 
  J. 
  Harris, 
  and 
  W. 
  A. 
  Osborxe. 
  

  

  (Communicated 
  by 
  Prof. 
  N. 
  Langley, 
  F.K.S. 
  Eeceived 
  August 
  14, 
  1919.) 
  

  

  (From 
  the 
  Australian 
  Institute 
  of 
  Tropical 
  Medicine, 
  Townsville, 
  Australia.) 
  

  

  The 
  effect 
  of 
  exercise 
  on 
  the 
  human 
  body 
  nas 
  been 
  made 
  the 
  subject 
  of 
  

   much 
  study 
  at 
  different 
  times. 
  Besearches 
  have 
  been 
  carried 
  out 
  under 
  

   atmospheric 
  conditions 
  such 
  as 
  prevail 
  in 
  different 
  parts 
  of 
  ^Northern 
  Europe, 
  

   and 
  they 
  have 
  been 
  extended 
  in 
  a 
  few 
  instances 
  to 
  the 
  effects 
  of 
  high 
  tem- 
  

   perature 
  and 
  humidity 
  upon 
  the 
  human 
  body. 
  In 
  the 
  latter 
  observations 
  

   the 
  conditions 
  such 
  as 
  high 
  temperature 
  and 
  varying 
  humidity 
  were 
  produced 
  

   by 
  artificial 
  means 
  only, 
  and 
  general 
  deductions 
  as 
  to 
  the 
  influence 
  of 
  an 
  

   actual 
  tropical 
  climate 
  upon 
  the 
  human 
  organism 
  cannot 
  be 
  safely 
  drawn 
  

   from 
  them. 
  In 
  these 
  experiments 
  the 
  subjects 
  were 
  living 
  in 
  a 
  temperate 
  

   climate, 
  were 
  exposed 
  to 
  heat 
  and 
  humidity 
  for 
  a 
  short 
  time 
  only, 
  and 
  left 
  

   the 
  hot 
  chamber 
  at 
  the 
  end 
  of 
  the 
  experiment 
  for 
  an 
  atmosphere 
  of 
  coolness 
  

   and 
  comfort 
  ; 
  in 
  the 
  tropics, 
  on 
  the 
  other 
  hand, 
  the 
  inhabitants 
  are 
  con- 
  

   tinuously 
  exposed 
  to 
  heat 
  and 
  humidity 
  without 
  respite. 
  Conclusions 
  of 
  

   real 
  value 
  can 
  thus 
  be 
  drawn 
  only 
  from 
  observations 
  actually 
  carried 
  out 
  in 
  

   a 
  hot 
  climate, 
  and 
  systematic 
  work 
  in 
  this 
  direction 
  is 
  still 
  lacking. 
  

  

  Although 
  observations 
  have 
  been 
  made 
  in 
  the 
  tropics 
  on 
  body 
  tempera- 
  

   ture, 
  blood 
  pressure, 
  pulse 
  and 
  respiration 
  rate, 
  and 
  metabolism, 
  yet 
  their 
  

   object 
  has 
  only 
  been 
  to 
  obtain 
  normal 
  standards 
  for 
  the 
  tropics 
  for 
  comparison 
  

   with 
  those 
  of 
  Europe. 
  

  

  The 
  following 
  experiments 
  were 
  carried 
  out 
  in 
  Townsville 
  during 
  the 
  

   hottest 
  months 
  of 
  the 
  year 
  (January 
  to 
  March), 
  during 
  which 
  time 
  the 
  wet- 
  

   bulb 
  temperature 
  stands 
  between 
  75° 
  and 
  80° 
  F., 
  occasionally 
  even 
  above, 
  and 
  

   the 
  dry-bulb 
  temperature 
  between 
  80° 
  and 
  90° 
  F. 
  ; 
  the 
  degree 
  of 
  saturation 
  

   of 
  the 
  atmosphere 
  is 
  very 
  high, 
  and 
  the 
  climate 
  " 
  trying." 
  The 
  climatic 
  con- 
  

   ditions—rainfall 
  and 
  temperature 
  — 
  in 
  Townsville 
  correspond, 
  according 
  to 
  

   Griffith 
  Taylor 
  (1918), 
  to 
  those 
  in 
  Calcutta, 
  with 
  the 
  exception 
  that 
  the 
  

   humidity 
  is 
  slightly 
  lower. 
  

  

  Methods. 
  

  

  The 
  observations 
  recorded 
  were 
  made 
  on 
  the 
  staff 
  of 
  the 
  Institute 
  

   (subjects 
  I 
  to 
  VI 
  and 
  VIII), 
  and 
  extended 
  over 
  two 
  wet 
  seasons. 
  During 
  

   the 
  early 
  part 
  of 
  the 
  second 
  year 
  one 
  of 
  the 
  authors 
  (W. 
  A. 
  0., 
  subject 
  VII), 
  

  

  