Accession Number : ADA326086

Title :   Effects of Training at Altitude on Anaerobic Distance and Critical Velocity,

Corporate Author : NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA

Personal Author(s) : Hodgdon, J. A. ; Vickers, R. R., Jr. ; Sucec, A. A.

PDF Url : ADA326086

Report Date : APR 1997

Pagination or Media Count : 10

Abstract : A work capacity model has been proposed as a means of estimating both aerobic and anaerobic capacities from a series of performance measures. The relationship between power and time is modeled as a rectangular hyperbola offset by an amount reflecting a power output which theoretically can be maintained indefinitely (Pcrit). Additionally, the amount of work that can be performed at levels above P(crit) is fixed and referred to as the anaerobic work capacity (Wan). Run times for distances of 1609, 3218, and 4828 m were recorded at sea level (140 m) 5 days prior to (PRE) travel to 2440 m altitude, within 5 days of arrival at 2440 m (ALT), and within 5 days of return to sea level (RTN) for 19 college track athletes. Values for critical velocity (Vcrit) and anaerobic distance (Dan) were determined for each individual at each session (PRE, ALT, and RTN) as the intercept and slope, respectively of the linear least squares regression of running velocity on the inverse of run time for the three performance runs. V(crit) was used as an estimate of P(crit) in the model and D as an estimate of W(an). There was a variation in V(crit) with session. V(crit) was smaller at altitude than at sea level. There was also a small but significant increase in V(crit) at RTN compared to PRE. V(crit) differed between genders, but there was no gender by session interaction. D(an) also varied with session having decreased values at altitude relative to sea level. There were no differences in PRE and RTN values for D(an) no gender differences, and no gender by session.

Descriptors :   *AEROBIC PROCESSES, *ANAEROBIC PROCESSES, *ENDURANCE(PHYSIOLOGY), *ALTITUDE ACCLIMATIZATION, PERFORMANCE TESTS, CAPACITY(QUANTITY), PERFORMANCE(HUMAN), HIGH ALTITUDE, PHYSICAL FITNESS, RESPONSE(BIOLOGY), LINEAR REGRESSION ANALYSIS, SEA LEVEL, OXYGEN CONSUMPTION, EXERCISE(PHYSIOLOGY).

Subject Categories : Biology
      Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE